0FUELWT Zero (0) Fuel Weight. 360, 540 AND OTHER NUMBERS Degrees in arc. 360 signifies one full turn through a n axis. A 360 turn is a flat turn; where the aircraft does not roll its wings bu t instead just sl... 3D Flight pattern noted by performance of particular aerobatics below an airplan e. 3F Informal reference for flip flop flying. Similar to 3D, except not as smooth. A Aircraft (JAR - FCL License) A/C Air conditioner Unit A/G Aircraft. Air Craft A/T Automatic throttle. AAIM Aircraft Autonomous Integrity Monitor ABAS Aircraft Based Augmenting System. ABC Aluminum-Brass-Chrome. Three main components used in the production of engin es that do not have rings. Engines with aluminum piston, chrome or nickel ... ABL Advanced Bimetallic Liner. A Specialized form of ABN. Instead of a single-ma terial plating,single-step, the ABL Plating process is based on a layered ... ABN Aluminum-Brass-Nickel. The components used in the production of non-ringed e ngines. These engines use an aluminum piston, and a nickel plated brass sl... ABOVE GROUND LEVEL (AGL). Distance between the aircraft and the ground Synonyms: radar altitude; ABSOLUTE Fixed reference, as opposed to moving reference. AC Advisory circular ACARS Airline Communication and Reporting System. ACAS Airborne Collision Avoidance System ACC Area Control Center. ACCELARATION Rate of change of velocity, either scalar or vector, often with sub scripts such as ENU or XYZ to denote the coordinate frame; time derivative of ve loc... ACCELERATION EAST Aircraft acceleration in true east direction; Symbols: A sub E ; Typical Units: ft/s-squared; Dimensions: Length / Time-squared; ACCELERATION NORTH Aircraft acceleration in true north direction; Symbols: A sub N; Typical Units: ft/s-squared; Dimensions: Length / Time-squared; ACCELEROMETER An inertial device for measuring acceleration, usually in three or thogonal axes (lateral X, longitudinal Y, and vertical Z); accelerometers usuall y co... ACCEPT To allow to proceed, for example with a position update, usually by an op erator; Compare: reject ACCIDENT Occurrence associated with the operation of an aircraft which takes pla ce between the time any person boards the aircraft with the intention of flight. .. ACCURACY Measure of exactness, possibly expressed in percent; Compare: precision ACG ATM/CNS Consulting Group (Euro control) ACI Airport Council International ACQUIRE To begin reception of useful data ACT active, activated, activation message ACTIVATE To begin performing a mission objective, such as flying along a radial of a radio station; usually refers to a mode of radio navigation, such flying a. .. AD Directive; Maintenance or modification ordered by FAA. ADB Aerodrome ADC Air Data Computer ADCUS Advise customs ADD Architecture Description Document ADDR Air data computer ADF Automatic Direction Finder ADI Attitude direction indicator ADIZ Automatic Direction Finder

ADLP Airborne Data Link Processor ADMINISTRATOR means the Federal Aviation Administrator or any person to whom he has delegated his authority in the matter concerned ADS Automatic dependent surveillance ADS-A Automatic Dependent Surveillance ADS-B Automatic Dependent Surveillance-Broadcast ADS-C Automatic Dependent Surveillance-Contract ADVERSE YAW Yaw generated when the ailerons are used. The lifting wing generates more drag, causing the plane to yaw toward it. ADVISORY Automatic Direction Finding AEA Association of European Airlines AECMA Association of European Aerospace Industries AEROBATICS Acrobatic or stunt maneuvers in the air such as loops, rolls, and oth ers. AERODYNAMIC COEFFICENTS means non-dimensional coefficients for aerodynamic force s and moments AES Aircraft Earth station AFB Air Force Base AFCS Automatic flight control system AFD Adaptive flight displays AFDS Autopilot flight director system AFIS Automated flight information system (AlliedSignal) AFM Airplane Flight Manual AFT Towards the rear. Used such as: "...with an aft center of gravity...." AFTER RUN OIL A lubricant designed to displace unburned fuel in the engine after running. The fuel can accelerate corrosion on some engine parts. By using an af ter ... AFTN Aeronautical Fixed Telecommunication Network AGA Aerodromes and Ground Aids (AIP) AGATE Advanced General Aviation Transport Experiments (NASA) AGDL Air-Ground Data Link AGL Above Ground Level. Used in reference to altitude, e.g. 5000 ft AGL. See als o MSL. AGLO Above Ground Level AGR Automatic flight control Sys. AGR SLANT RANGE Straight-line distance from the aircraft to a point on the groun d; AHOV Approach to hover AHRS Attitude-heading reference system. AI Altitude indicator AIC Aeronautical Information Circular AIDING A process by which one or more sensors provide data to another sensor to produce results better than any single sensor; aiding occurs at the data sour... AILERON A control surface on fixed-wing aircraft, usually mounted on the aft edg e of wings, that controls roll, and is controlled by the wheel; Symbols: delta.. . AILERONS Hinged control surfaces on usually the wing which can change the wing`s lifting properties. Often located near the tips. Used to bank the aircraft. Th. .. AIM ATFM Information Message AIM (AIRMANS` INFORMATION MANUAL) A primary FAA publication whose purpose is to instruct airmen about operating in the US airspace system. AIP Aeronautical Information Publication AIR CARRIER Person who undertakes directly, by lease, or other arrangement, to e ngage in air transportation. AIR DATA Values computed from pitot, static and temperature measurements, usuall y by means of a digital computer; ARINC 575 defines outputs. AIR DATA COMPUTER (ADC) A primary navigation data source. A navigation sensor ba sed on atmospheric data sensors; usually measures static pressure, dynamic press

ure, and outsi... AIR DATA DEAD RECKONING (ADDR) Dead reckoning navigation based on simple instrum ents as source (barometric altimeter, magnetic compass, airspeed indicator, know n wind conditions); s... AIR DEFENSE IDENTIFICATION ZONE(ADIZ) The area of airspace over land or water, e xtending upward from the surface, within which the ready identification, the loc ation, and the control of ai... AIR GROUND RANGING (AGR) Straight-line distance from the aircraft to a point on the ground; AIR ROUTE TRAFFIC CONTROL CENTER(ARTCC) OR CENTER Facility established to provid e air traffic control service to aircraft operating on IFR flight plans within c ontrolled airspace and principally durin... AIR TAXI An aircraft operator who conducts operations for hire or compensation i n accordance with FAR Part 135 in an aircraft with 30 or fewer passenger seats . .. AIR TRAFFIC means aircraft operating in the air or on an airport surface, exclus ive of loading ramps and parking areas AIR TRAFFIC CLEARANCE means an authorization by air traffic control, for the pur pose of preventing collision between known aircraft, for an aircraft to proceed under specif... AIR TRAFFIC CONTROL means a service operated by appropriate authority to promote the safe, orderly, and expeditious flow of air traffic AIR TRAFFIC CONTROL (ATC) A service operated by the appropriate authority to pro mote the safe, orderly, and expeditious flow of air traffic. AIR TRAFFIC CONTROL (ATC). Standard aviation term AIR TRANSPORTATION means interstate, overseas, or foreign air transportation or the transportation of mail by aircraft. Alert Area. An alert area is established to infor... AIR-MASS FLIGHT PATH ANGLE Angle in vertical plane of earth speed vector and gro undspeed vector; occasional definition for flight path angle; Compare: earth-ref erenced flight pa... AIRAC Aeronautical Information Regulation and Control AIRBORNE GROCER A device for barrage-jamming of Wurzburgs. Extremely vulnerable to being homed onto. AIRCRAFT means a device that is used or intended to be used for flight in the ai r AIRCRAFT (AC) A craft that flies in the air; either fixed or rotary wing. AIRCRAFT ENGING means an engine that is used or intended to be used for propelli ng aircraft. It includes turbo superchargers, appurtenances, and accessories nec essary... AIRFOIL The shape of the wing when looking at its profile. Usually a raindrop ty pe shape. AIRFRAME means the fuselage, booms, nacelles, cowlings, fairings, airfoil surfac es (including rotors but excluding propellers and rotating airfoils of engines). .. AIRPLANE means an engine-driven fixed-wing aircraft heavier than air, that is su pported in flight by the dynamic reaction of the air against its wings AIRPORT An area on land or water that is used or intended to be used for the lan ding and takeoff of aircraft and includes its buildings and facilities, if any.. . AIRPORT TRAFFIC CONTROL TOWER(ATCT) A terminal facility that uses air/ground com munications, visual signaling, and other devices to provide ATC services to airc raft operating in the vici... AIRSHIP means an engine-driven lighter-than-air aircraft that can be steered AIRSPEED The speed of an aircraft relative to its surrounding air mass. See: cal ibrated airspeed; indicated airspeed; true airspeed. AIRSPEED (AS, A/S) See Also: state data, true airspeed, indicated airspeed, cali brated airspeed; Symbols: V sub A/S; Typical Units: kt, ft/s; Dimensions: Length / Time; AIRSPEED INDICATOR An onboard instrument which registers velocity through the ai

r, in miles per hour or in knots. AIRY A standard model for computing earth data AIS Aeronautical Information Service ALIGHNMENT A basic control to a data source from controls and displays to align a device. Also a procedure to align physical devices, usually navigation sensors ,... ALL-WEATHER FIGHTER/INTERCEPTOR -equipped jet fighter airplane which can operate at night or in the worst weather. ALS approach light system. ALT Altitude ALTERNATE AIRPORT means an airport at which an aircraft may land if a landing at the intended airport becomes inadvisable ALTIDUTE GAIN (KALTINT) A guidance control law parameter, generated by the verti cal guidance modes; varies control authority of the altitude integral in vertica l guidance, to... ALTIMETER An onboard instrument which senses air pressure in order to gauge alti tude. ALTIMETER SETTING The barometric pressure reading used to adjust a pressure alti meter for variations in existing atmospheric pressure or to the standard altimet er setti... ALTINTVAL Altitude integral input ALTITUDE Height, usually with respect to the terrain below (radar altitude, feet above closest dirt) or fixed earth reference (barometric altitude, feet above . .. ALTITUDE ENGINE means a reciprocating aircraft engine having a rated takeoff pow er that is producible from sea level to an established higher altitude ALTITUDE ERROR A basic output from guidance to flight director, indicating the d ifference between actual altitude and desired altitude; Symbols: DELTA h; Typica l Uni... ALTITUDE ERROR SCALE FACTOR(KZSF) A guidance control law parameter, generated by the vertical guidance modes; varies control authority of vertical guidance ALTITUDE INTEGRAL INPUT (ALTINTVAL). A guidance control law parameter, generated by the vertical guidance modes; a reference altitude for reducing steady-state errors in altitude error Ty... ALTITUDE INTEGRAL LIMIT (INTMAGLIM). A guidance control law parameter, generated by the vertical guidance modes; limits the magnitude of altitude integral value Typical Units: ft; Dimensi... ALTN Alternate ALTP Airline Transport Pilot`s License) AM Amplitude modulation AMC Acceptable Means of Compliance AME Aviation Medical Examiner (U.S.) AMIE AIS Met Information Equipment (Swiss Computer Self Briefing System) AMLCD Active-matrix liquid crystal display. AMPHIBIAN An aircraft that can fly off of water or land. The wheels retract into the hull or floats, depending upon the type of aircraft. An amphibian can land ... AMS Aero Medical Services AMSL Above mean sea level ANGEL OF ATTACK The difference between pitch and the air-referenced flight path angle; the angle between the aircraft center line and the airspeed vector in the verti... ANGEL OF ATTACK (AOA) The angle between the chord line of the wing of an aircraf t and the relative wind. ANGLE OF ATTACK The angle that the wing penetrates the air. As the angle of atta ck increases so does lift, up to a point (and drag). ANGULAR ACCELERATION Rate of change of angular velocity, either scalar or vector , often with subscripts such as XYZ to denote the coordinate frame; time derivat ive of angu... ANGULAR POSITION Amount of rotation about an axis, either scalar or vector, ofte

n with subscripts such as XYZ to denote the coordinate frame; time integral of a ngular ... ANGULAR VELOCITY Rate of change of rotation about an axis, either scalar or vect or, often with subscripts such as XYZ to denote the coordinate frame; time deriv ative o... ANM ATFM Notification Message ANNUAL Mandatory inspection of airframe and power plant that occurs every 12 mon ths. ANNUNCIATOR Any one of warning, caution, or advisory; Synonyms: alert; ANR Air Navigation Routes ANS Active Noise System ANSP Air Navigation Services ANT Airspace Navigation Team (Euro control) AO Aircraft Operator AOC Airline Operations Centre AOPA Aircraft Owners and Pilots Association AOR Aero of Responsibility AOWIR Aircraft Operator What-If Reroute (CFMU/IFPS) AP Auto Pilot APERIODIC A process that executes based on events rather than a fixed rate, it i s not synchronized to other processes of interest; Compare: periodic; APP Approach (Control) APPLIANCE means any instrument, mechanism, equipment, part, apparatus, appurtena nce, or accessory, including communications equipment, that is used or intended ... APPR Approach APPROACH (APPR) To fly towards a point; a basic guidance mode, providing lateral guidance, longitudinal guidance, and vertical guidance to a point at an operato r sele... APPROACH SPEED The recommended speed contained in aircraft manuals used by pilot s when making an approach to landing. This speed will vary for different segment s of ... APPROACH TO HOVER (AHOV) Hover approach of a rotary wing aircraft. APPROVED unless used with reference to another person, means approved by the Adm inistrator APR Auxiliary Power Reserve APRON A defined area on an airport or heliport intended to accommodate aircraft for purposes of loading or unloading passengers or cargo, refueling, parking... APU Auxiliary power unit ARCID Aircraft Identification AREA The number of square inches (or feet) of the wing. It`s the wingspan multip lied by the wing`s chord. The area of a tapered wing is the wingspan multip... AREA NAVIGATION (RNAV) means a method of navigation that permits aircraft operat ions on any desired course within the coverage of station-referenced navigation signals or wi... AREA NAVIGATION LOW ROUTE means an area navigation route within the airspace ext ending upward from 1,200 feet above the surface of the earth to, but not includi ng, 18,000 feet ... AREA NAVIGATION ROUTE means an area navigation route within the airspace extendi ng upward from, and including, 18,000 feet MSL to flight level 450 ARF Almost Ready to Fly. A prefabricated aircraft. ARINC Aeronautical Radio, Inc. A nonprofit corporation owned by member airlines to define form, fit, and function of avionics equipment and to provide radio... ARINC 419 Digital information transfer characteristics as applied in ARINC 500-s eries equipment specifications. ARINC 547 Digital specification for ILS reference sensors. ARINC 561 Inertial navigation system specifications. ARINC 568 Inertial sensor DME reference specification. ARINC 571 Inertial sensor attitude-heading reference system specifications. ARINC 575 Digital air-data system specifications.

ARINC 700-SERIES All-digital equipment specifications for new-generation transpo rt category aircraft. ARINC 743 All-digital specifications for FANS-1 compatibility. ARM To strive for a mission objective, such as flying toward a radial of a radio station; usually refers to a mode of radio navigation, such as striving t... ARMED FORCES means the Army, Navy, Air Force, Marine Corps, and Coast Guard, inc luding their regular and reserve components and members serving without componen t s... ARN ATS Route Network ARNS Aeronautical Radio Navigation Services ARO Air Traffic Services Reporting Office (or Airport Reporting Office) ARP Airport Reference Point ARR Arrival ASA Auto land status annunciator. ASAP As soon as possible ASAS Airborne Separation Assurance system ASCB Avionics standard communication bus (Honeywell) ASDIC :, (Allied Submarine Investigation Committee), a ship-borne sonic detectio n system first developed in 1917. ASF Air Safety Foundation (AOPA-USA) ASL Above sea level ASM Air Space Management ASPECT RATIO The wingspan divided by the chord. Aspect ratio is important where a wing`s efficiency is concerned. A short aspect ratio (short wings) is better f or ... ASPH Asphalt Runway ASPIDISTRA Codename for the ground transmitters operating the DARTBOARD interfer ence system ASR means airport surveillance radar. ASTRONOMICAL LATITUDE Latitude measured with respect to vector of apparent gravi ty; Compare: geocentric latitude, geodetic latitude; Symbols: Phi sub A; Typical Units: rad,... ASV Air to Surface Vessel. An airborne or ship borne radar used to detect surfac ed U-boats and other surface vessels. ATA Actual Time of Arrival ATC Air Traffic Control. A service operated by appropriate authority to promote the safe, orderly and expeditious flow of air traffic. ATCO Air Traffic Control ATD Actual Time of Departure ATE Actual Time Enroute ATFM Air Traffic Flow Management ATI AND ATR ARINC form factors. ATIR Air Traffic Incident Report ("Near-Miss Report") ATIS Automatic Terminal Information Service ATM Air traffic management. ATMOSPHERIC DATA Air Traffic Control ATN Air Traffic Management ATP Airline Transport Pilot (the "highest" grade of pilot certificate) ATPL Airline Transport Pilot (`s License) ATS Air Traffic Services ATSP Air Traffic Service Provider ATTIDUDE HEADING REFERENCE SYSTEM(AHRS) Combines information from a Magnetic Hea ding Sensor with self-contained aircraft acceleration data to provide attitude, heading, position, body inerti... ATTITUDE The primary aircraft angles in the state vector; pitch, roll, and yaw; ATTITUDE INDICATOR A vacuum powered instrument which displays pitch and roll mov ement about the lateral and longitudinal axes. ATV Adjustable Travel Volume. Used on many radio transmitters to limit, or exten d, maximum throw of a servo. ATV can indicate having a single adjustment w... AUDIO PANEL Electronic device used to switch between radios.

AUFKL RUNG Reconnaissance AUSTRALIAN NATIONAL A standard model for computing earth data AUTOGYRO An aircraft equipped with a rotating wing, or rotor, to sustain itself in the air, and a propeller to move forward. AUTOMATIC DIRECTION FINDING(ADF) A basic guidance mode, providing lateral guidan ce to a radio station. Equipment that determines bearing to a radio station; AUTOMATIC FLIGHT CONTROL SYSTEM(AFCS) An automated system for controlling the pr imary flight controls, often with built-in functions for guidance and flight dir ector, and sometimes radio n... AUTOMATIC TERMINAL INFORMATIONSERVICE (ATIS) The continuous broadcast of recorde d non control information in selected terminal areas. Its purpose is to improve controller effectiveness and to rel... AUTOPILOT A method of an automatic flight control system which controls primary flight controls to meet specific mission requirments,I.E. maintain a heading or ... AUTOROTATION means a rotorcraft flight condition in which the lifting rotor is d riven entirely by action of the air when the rotorcraft is in motion AUX FUEL Auxiliary fuel tanks. AUXILIARY ROTER means a rotor that serves either to counteract the effect of the main rotor torque on a rotorcraft or to maneuver the rotorcraft about one or mo re of ... AVERAGING FILTER A filter for combining multiple data sources, usually of the sa me type, by adding with weighted averages; a simple average of the data sources; Compar... AVGAS Aviation Gasoline (piston aircraft fuel) AVM Avionics monitor AWACS Airborne Warning And Control System. An electronically very souped-up Boei ng 707. (Pronounced "AY-wax.") AWY Airway AXIS The line around which a body rotates. AZIMUTH An angle in the horizontal plane, usually measured with respect to body coordinates B Airspace ICAO Class B BABLW Bundesamt fr Betriebe der Luftwaffe BACKLASH Term describing the amount of play between gears, or gear mesh. If too loose, the gear can slip, or strip the teeth. Too tight, and excessive wear is . .. BALL LINK Connection using a ball, and a link which rotates on the ball. Used to connect the servo to a control surface or lever. BALT SEL Barometric altitude select BAND-PASS FILTER (BPF). A filter that allows frequencies between two cutoff freq uencies to pass while attenuating frequencies outside the cutoff frequencies; a band-pass filt... BANK ANGLE The angle between the horizontal plane and the right wing in the late ral plane, positive when the right wing is down; Synonyms: roll; Symbols: phi, P h... BARN DOOR AILERONS Larger, built up ailerons rather than an aileron from a simpl e strip of solid wood like some kits have. BARNSTORMER A pilot who, in the early years of aviation, gave airplane rides to people and performed aerobatics for a fee. BAROMETRIC ALTITDUDE SELECT(BALT SEL) A basic guidance mode, providing vertical guidance to an operator selected barometric altitude; BAROMETRIC ALTITUDE Height with respect to fixed earth reference (above mean sea level); Synonyms: pressure altitude; Symbols: h sub b; Typical Units: ft; Dimen sions: Len... BAROMETRIC PRESSURE Height with respect to fixed earth reference (barometric alt itude, feet above mean sea level); Synonyms: pressure; Symbols: p sub a; Typical Units: in... BASE LOAD ANTENNA A rigid, short antenna mounted to the aircraft. Used to replac e the longer receiver antenna.

BASIC OPERATING WEIGHT (BOW) Empty weight typically equipped + unusable fuel and trapped liquids + 2 pilots (400 lbs.) + supplies. BAZL Bundesamt fr Zivilluftfahrt (Swiss CAA) BBJ Boeing Business Jet BC Bus controller BCD Binary coded decimal. BDY Boundary BEACON A device, usually based on the ground, that aids in determining position or direction; BEAM WIDTH The included angel of a weather radar interrogation signal. BEARING (BRG). Direction on a compass; Synonyms: direction; Symbols: B; Typical Units: rad, deg; BEF Before BENDIX Avionics mfgr. BESSEL 1841 A standard model for computing earth data BFR Biennial Flight Review (USA) BFU Bro fr Flugunfalluntersuchungen BIAS An offset applied to a measurement for error correction; Synonyms: offset BIG BEN North Sea patrols undertaken by Bomber Command to try to detect the guid ance system of the German V2 rockets. BIG WING A plan espoused by DRS Bader during the Battle of Britain. A tactic to use five or more fighter squadrons together. The plan was not workable until af. .. BINDING What occurs when the friction at a joint is stronger than the linkage. BIS Built-in simulation BITE Built-in test equipment. BLACK THURSDAY August 15th 1940. The day on which the Luftwaffe took at least 90 losses. BLADE BALANCER Usually called a "prop balancer" for aircraft. Used to ensure tha t the propeller and spinner are equally balanced side-to-side to avoid vibration prob... BLEED AIR High pressure air ducted from engine to pressurize cabin and other use s. BLITZKRIEG A tactic of aerial artillery in support of fast-moving armor. The ter m was inaccurately applied to the bombing of London and other British cities in 1... BLONDE An automatic camera which provided continuous record of signals within a specified band, as received by a cathode ray tube. BODY The aircraft, usually referring to a coordinate system; BODY COORDINATES Coordinates referenced to the body of the aircraft; See Also: X YZ; Compare: earth coordinates, stability coordinates BOEING The Boeing Company, with headquarters in Seattle, Washington, U.S., one o f the nation`s largest exporters. The company is a major U.S. government cont... BOOTS Inflatable device on leading edge of wings and tail. Used to remove ice. BOOZER RAF airborne device which warned that the aircraft carrying it was being monitored by Wrzburg BORESIGHT ANGLE The angle between the center line of a sensor and aircraft cente r line, either by design or by misalignment; BORESIGHTING A basic control to a data source from controls and displays to bore sight a device; Also, a procedure to align the center line of physical devices, us... BORING HOLES IN THE SKY Having fun flying an R/C airplane, without any pre-deter mined flight pattern. BPF Band-pass filter BRACING WIRE A solid steel wire used to support the structure of an airplane`s w ings or fuselage. BRAKE HORSEPOWER means the power delivered at the propeller shaft (main drive or main output) of an aircraft engine BRG Bearing

BRIAR A ground transmitter operating in the 300-600 MHz band used to jam enemy Wr zburg ground receivers. BRNAV Basic RNAV (RNP-5 compliant) BSE Bovine Spongiform Encephalopathy (or: mad cow disease) BSU Beam steering unit. BUDDY OR TRAINER BOX Two similar transmitters that are wired together with a "tr ainer chord." This is most useful when learning to fly -- it`s the same as havin g dual cont... BUILT-IN SIMULATION (BIS) Function in avionics software that simulates sensors, aircraft, and pilot, to exercise avionics software (including navigation, radio navigation, guid... BUS CONTOLLER (BC). Term defining role of device on a MIL-STD-1553 bus as being master; Compare: remote terminal; C Airspace ICAO Class C C(-OFFICE) Crew Office (AIS/MET) C/R Counter-rotating propellers. CA Abbreviation for cyanoacrylate. An instant type glue that is available in var ious viscosities (Thin, Medium, Thick, and Gel). These glues are ideal fo... CAA Civil Aviation Authority (of a country) CAB Civilian Aviation Board. CABIN PRESSURIZING A mechanism used to maintain air pressure in an airplane`s se aled cabin at a level suitable for passengers. CALIBRATED AIRSPEED Calibrated airspeed is equal to true airspeed in standard at mosphere at sea level. CALIBRATED AIRSPEED (CAS) The indicated airspeed of an aircraft, corrected for p osition and instrument error. Calibrated airspeed is equal to true airspeed in s tandard atmosphe... CALIBRATION A basic control to a data source from controls and displays for cali brating a device; Also, a procedure to adjust physical devices so that they prov id... CAMBER If you draw a line through the center of the airfoil that`s exactly halfway between the top and bottom surface, you get the mean airfoil line. Depend... CANARD The horizontal surface forward of the wing used to control pitch. It`s fo und on very few aircraft. Also the word used to describe aircraft that have a... CANT ANGLE Angle of nacelle mounting; Typical Units: rad, deg; CAPS Complete Aircraft Parachute System CAPTURE To attain an objective, such as reaching a radial of a radio station; Se e Also: capture criterion; Compare: activate, arm; CAPTURE ITERATION A test case to determine if an armed objective has been captur ed; In avionics, an aircraft might have an objective to fly to a radial of a rad io stati... CARBURETOR The part of the engine, which controls the speed or throttle setting and lean/rich mixture via setting of the needle valve. CARD II CNS Applications Research CARPET Airborne jammer of German ground radar 300-600 Megacycle band. Later Amer ican developments allowed a more precise use. CAS Calibrated airspeed CASA Calibrated Air Speed CASTER To swivel or rotate slightly. CAT Commercial Air Traffic CAT I Instrument Landing Category I (similar: CAT II, CAT III) CATEGORY 1) As used with respect to the certification, ratings, privileges, and limitations of airmen, means a broad classification of aircraft. Examples inclu. .. CATEGORY A with respect to transport category rotorcraft, means multiengine roto rcraft designed with engine and system isolation features specified in Part 29 a n... CATEGORY B with respect to transport category rotorcraft, means single- engine o

r multiengine rotorcraft which do not fully meet all Category A standards. Categ o... CATEGORY I (CAT I) An ILS facility providing operation down to a 200 foot decisi on height and an RVR of not less than 2,400 feet. CATEGORY II (CAT II) An ILS facility providing operation down to a 100-foot deci sion height and an RVR of not less than 1,200 feet. CATEGORY II OPERATIONS with respect to the operation of aircraft, means a straig ht-in ILS approach to the runway of an airport under a Category II ILS instrumen t approach pr... CATEGORY III OPERATIONS with respect to the operation of aircraft, means an ILS approach to, and landing on, the runway of an airport using a Category III ILS i nstrument appr... CATEGORY IIIA (CAT IIIA) An ILS facility providing operation with no decision he ight to and along the surface of the runway with external visual reference durin g the final pha... CATEGORY IIIB (CAT IIIB) An ILS facility providing operation with no decision he ight limit to and along the surface of the runway without reliance on external v isual reference... CATEGORY IIIC (CAT IIIC) An ILS facility providing operation with no decision he ight limit to and along the surface of the runway and taxiways without reliance on external vis... CAUTION A signal which alerts the operator to an impending dangerous condition r equiring attention, but not necessarily immediate action (from MIL-STD-1472D);.. . CAVOK Ceiling and Visibility ok (good VFR weather) CAVU Ceiling And Visibility Unlimited. Perfect flying weather -- no major clouds , no major haze. CB Cumulonimbus CBA Cost-Benefit Analysis CCLIM Course cut limit CDA Continuous Descent Approach CDI Course Deviation Indicator CDM Collaborative Decision-Making CDR Conditional Route (FUA) CDTI Cockpit Display of Traffic Information CDU Control-display unit. CEAC Confrence Europenne de l`Aviation Civile (see ECAC) CEILING The heights above the earth`s surface of the lowest layer of clouds or o bscuring phenomena that is reported as "broken," "overcast," or "obscuration,".. . CENTER An Air Route Traffic Control Center (ARTCC). See Air Route Traffic Contro l Center. CENTER LINE Standard aviation term CENTER OF PRESSURE An imaginary point on the chord of an airfoil where the total of all aerodynamic forces are assumed to act. CENTER-POD CONFIGURATION A type of airplane whose fairly short fuselage is not c onnected to the tail surfaces. CENTRIFUGAL FORCE The force created by a body`s tendency to follow a straight pa th working against a force which causes it to move in a curve, the resultant for ce which... CEP Circular error probability CERTIFICATED AIRPORT An airport operating under FAR Part 139. The FAA issues air port operating certificates to all airports serving scheduled or unscheduled air carrier ai... CESC Cescom Maintenance Program. CFI Certified Flight Instructor. CFII Certified Flight Instructor IFR (USA) CFIT Controlled Flight Into Terrain CFMU Central Flow Management Unit of Euro control CG Center of Gravity. For air crafting purposes, this is usually considered -- t

he point at which the airplane balances fore to aft. This point is critic... CH Center of Gravity CHAIN HOME An early form of radar using linked radar stations on the east and so uth coasts of Britain to warn of approaching aircraft. CHANDELLE A very steep climbing turn where the airplane makes a 180 change of dir ection. CHANNEL The frequency number used by the transmitter to send signals to the rece iver. If radios transmit on the same frequency, or channel, glitching will occ.. . CHARGE JACK The plug receptacle of the switch harness into which the charger is plugged to charge the airborne battery. An expanded scale voltmeter (ESV) can al so... CHARGER Device used to recharge batteries and usually supplied with the radio if NiCad batteries are included. CHASTISE Codename for the Dambusters` raid. 16-17 May 1943 CHF Swiss Francs (Bankers` code) CHICKEN STICK A hand-held stick used to flip start a aircraft airplane engine. CHORD The "depth" of the wing, its distance from leading edge to trailing edge. One of the components used to determine wing area. May vary from root to tip... CHORD LINE A line drawn from the leading edge of the wing to the trailing edge. CIA CFMU Internet Application CILO Capacity Increase Lower airspace CIRCULAR ERROR PROBABILITY (CEP) A probability that a percentage of two-dimensio n measurements will lie within a circle of given radius, with the circle centere d at truth or mean of t... CIRCUS A fighter sweep over enemy territory, particularly airfields to draw the fighters into battle. CIV Civil CIVIL AIRCRAFT means aircraft other than public aircraft. "Class": (1) As used w ith respect to the certification, ratings, privileges, and limitations of airmen , mea... CLARKE 1866 A standard model for computing earth data CLARKE 1880 A standard model for computing earth data CLASS A ROTORCRAFT-LOAD COMBINATION one in which the external load cannot move f reely, cannot be jettisoned, and does not extend below the landing gear CLASS B ROTORCRAFT-LOAD COMBINATION one in which the external load is jettison a ble and is lifted free of land or water during the rotorcraft operation CLASS C ROTORCRAFT-LOAD COMBINATION one in which the external load is jettisonab le and remains in contact with land or water during the rotorcraft operation CLASS D ROTORCRAFT-LOAD COMBINATION one in which the external- load is other tha n a Class A, B, or C and has been specifically approved by the Administrator for that operation CLASS G AIRSPACE (UNCONTROLLEDAIRSPACE) The airspace not designated as Class A, B, C, D or E. CLEARWAY (1) For turbine engine powered airplanes certificated after August 29, 1959, an area beyond the runway, not less than 500 feet wide, centrally located. .. CLIMBOUT SPEED with respect to rotorcraft, means a referenced airspeed which res ults in a flight path clear of the height-velocity envelope during initial climb out CLR Clearance (or cleared) CLSD Closed CLUNK Term used to describe the weighted end of the fuel pickup line in the fuel tank. The purpose of this is to ensure that the fuel pickup is always in th... CLUTCH The section of the drive train used to engage the gear when throttle is i ncreased, and disengage while engine is at idle. This ensures that the rotor ... CMIC Civil Military Interface standing Committee CMOS Complementary metal oxide semiconductor. CMU Communications management unit.

CNS Communications, navigation and surveillance. CNS/ATM Communication Navigation Surveillance/Air Traffic Management COA Certificate of Airworthiness COAL SCUTTLE A modification to an aircraft`s existing H2S navigational radar to give a visual bearing every 30 seconds on a signal under investigation. COCKPIT VOICE RECORDER (CVR) Device that records crew conversations. Used in acc ident investigations. CODA Central Office for Delay Analysis (Euro control) COFA Certificate of Airworthiness COHERENT DETECTION A technique used in certain ADF receivers to improve useful r ange. COLLECTIVE A flight control operated by moving up or down with hand in rotary-wi ng aircraft, primarily to control lift (altitude); controls collective (total) p i... COLLECTIVE CUE A vertical flight director cue for rotary-wing aircraft, primaril y to control altitude, by changing power; Compare: yoke cue; Symbols: Gamma sub "VERT... COLLINS Avionics mfgr. COM Communications COMBINED CENTER/RAPCON (CERAP) An air traffic facility which combines the functi ons of an ARTCC and a radar approach control facility. COMMANDED Controls given to a device, not that the device necessarily obeyed the controls COMMERCIAL OPERATOR means a person who, for compensation or hire, engages in the carriage by aircraft in air commerce of persons or property, other than as an a ir carrier... COMMON TRAFFIC ADVISORY FREQUENCY(CTAF) A frequency designed for the purpose of carrying out airport advisory practices while operating to or from an airport wi thout an operating control tow... COMMUNICATIONS How well equipment is communicating; Values: operational, degrade d, failed COMMUTER An air carrier operator operating under 14 CFR 135 that carries passeng ers on at least five round trips per week on at least one route between two or . .. COMPLIMETARY FILTEROMPLEMENTARYFILTER A filter in which the complement of the fi lter is desired, giving the effect of a high-pass filter by implementing a low-p ass filter; a filter for com... COMPOSITE VIDEO Analog VOR receiver output before processing. COMPUTER CYCLE In a periodic, cyclical computer system, the most basic, fastest timing loop CONSOL a kind of low or medium frequency long range navigational aid CONT Teledyne-Continental (engine mfgr.) CONTACT DIGITIZER A mechanical device that converts analog information to digita l codes by means of electrical contacts. CONTINUOUS EQUATION A mathematical relationship to describe a function of time, expressed in terms of continuous time; Compare: difference equation, differentia l equation... CONTINUOUS TIME Time which can have any point expressed as a real quantity, with out regard for any specific interval or processing rate; Compare: discrete time; CONTINUOUS TIME (CW) A radio carrier broadcast that does not have modulation CONTOL LAW The mathematical definition of a system used to control or to change the dynamic response of a system; CONTRAIL Streaks of condensed water vapor created in the air by aircraft flying at high altitudes. CONTROL INPUTS The controlling influences a pilot exerts on an aircraft`s contro l surfaces. CONTROL SURFACE Any one of the various moveable portions of the wings, tail surf aces, or canard. CONTROL SURFACES The moving, pilot-controllable parts of the air-frame, includin

g flaps, ailerons, rudders and elevators CONTROLLED AIRSPACE An airspace of defined dimensions within which air traffic c ontrol service is provided to IFR flights and to VFR flights in accordance with the airspa... CONTROLLED SPEED (CTS) A guidance control law parameter, generated by the longit udinal guidance modes; speed that is being controlled Typical Units: ft/s, kt; D imensions: Le... CONTROLLER ALTITUDE (CTALT) A guidance control law parameter, generated by the v ertical guidance modes; altitude that is being controlled Typical Units: ft; Dim ensions: Length; CONVENTIONAL GEAR The landing gear arrangement where the airplane has a main gea r and a tail wheel. COORDINATED TURN A combination of control inputs that cause a maximally efficien t turn. COPI Communications CORIOLIS ACCELERATION Tangential acceleration caused by motion on a radial on a rotating surface, in aviation, it is acceleration in the earth`s longitudinal di rection caus... CORKSCREWING Evasive maneuver adopted by British bombers. CORONA British ground transmitter operating at 2.56 MHz based at Rugby and Leafi eld. Used to transmit confusing signals over the German night fighter RT cont... CORRECTED ALTITUDE Measured pressure altitude corrected for instrumentation erro rs COUPLED Describes operation of flight director in which automatic flight control system causes flight controls to follow commands from flight director or erro.. . COURSE Towards a point at a specified course; Compare: direct COURSE CUT LIMIT (CCLIM). A guidance control law parameter, generated by the lat eral guidance modes; limits the intercept angle of the flight path with a desire d course, typica... COWL The large molded fairing around an engine. It serves two purposes when done right: It helps the airflow go smoothly around the front of the airplane, ... COWLING A removable metal covering placed over and around an airplane`s engine ( s)). CPDLC Controller-Pilot Data Link Capability (or Communications) CPL Commercial Pilots License CR Class Rating CRAM Conditional Route Availability Message CRCO Central Route Charge Office of Euro control CRE Class Rating Examiner CREEP BACK The progressive dropping of bombs before the target was reached. CREEPING LINE SEARCH A pattern of equally spaced parallel lines followed for sea rching the ground from an aircraft; Compare: expanding square search, sector sea rch; CREWMEMBER means a person assigned to perform duty in an aircraft during flight time CRI Class Rating Instructor CRITICAL ALTITUDE means the maximum altitude at which, in standard atmosphere, i t is possible to maintain, at a specified rotational speed, a specified power or a speci... CRITICAL ENGINE means the engine whose failure would most adversely affect the p erformance or handling qualities of an aircraft CRM Cockpit Resource Management CROSS TRACK Perpendicular to the course; CROSS-OVER EXHAUST A mechanism through which the exhaust from one side of an inl ine engine is carried to the other. CROSSTRACK DEVIATION (XTKD) A guidance control law parameter, generated by the l ateral guidance modes; distance from the aircraft to a desired course measured a long a perpendicul...

CROSSTRACK DEVIATION GAIN (KXTKD) A guidance control law parameter, generated by the lateral guidance modes; relative weighting of cross track deviation in the lateral control law Typi... CROSSTRACK DEVIATION RATE (XTKR) A guidance control law parameter, generated by the lateral guidance modes; rate of change of cross track deviation Typical Unit s: ft/s; Dimensions: Le... CROSSTRACK DEVIATION RATE GAIN(KXTKR) A guidance control law parameter, generate d by the lateral guidance modes; relative weighting of the cross track deviation rate in the lateral control... CRS Conditional Route System (FUA: "Temporary Airways" on request) CRT Cathode ray tube. CSDB Commercial standard data bus. CTAF Common Traffic Advisory Frequency CTALT Controlled altitude CTR Control Zone CTS Controlled speed CU Cumulus CUE A indicator to an operator for control placement, tells the operator where t o place controls; Synonyms: command CURSOR See: moving cursor, target cursor CUST Customs CUTOFF FREQUENCY The frequency at which the gain of a filter is at an edge of a band, usually taken to be when gain is 0.5, or -3.01dB; the frequency at which t he outp... CVFR Controlled VFR (still existing in some countries) CVR Cockpit Voice Recorder CYCLES Pertaining to turbine engines. Cycle begins with starting, continues thro ugh full-power, and ends with shutdown. CYCLIC See: longitudinal cyclic, lateral cyclic; D Airspace ICAO Class D D.R. DEAD RECKONING; system of navigation. DA Drift angle DADC Digital air-data computer DAMPED FREQUENCY The frequency of oscillation of an under damped second-order fi lter; See Also: second-order filter; Symbols: omega; Typical Units: rad/s, Hz; D imensio... DAMPING RATIO Control parameter for a second order filter. Symbols: zeta; DAP Decision Altitude DARTBOARD Ground-based interference from "ASPIDISTRA" of enemy RT and WT channel s in the 300 kHz band. DATA SOURCE OBJECT (DSO) Software that receives data from a physical device, tra nslates the data into standard units, maintains equipment status, and provides a common interfa... DATA TRANSFER SYSTEM Total pressure DATA TRANSFER SYSTEM (DTS). A device for transferring data with avionics, simila r to a diskette drive; DB Decibel DC Dual Control DCA Directorate of Civil Aviation DCT direct DEAD RECKONING (DR) A method of navigation based on basic information (barometri c altitude, magnetic heading, airspeed, wind conditions) from best available sou rce; somet... DEAD STICK A term used to describe unpowered flight (glide) when the engine quit s running. DECISION HEIGHT with respect to the operation of aircraft, means the height at w hich a decision must be made, during an ILS or PAR instrument approach, to eithe r cont... DECISION HEIGHT (DH) With respect to the operation of aircraft, means the height at which a decision must be made during an ILS, MLS, or PAR instrument approach

to either ... DECKER Phosphorous coated rags transported in water and designed to fire crops a nd forests. This tactic was of little effect. DEG Degrees DEL Delay/delayed DELAY Delays are incurred when any action is taken by a controller that prevents an aircraft from proceeding normally to its destination for an interval of ... DELTA Difference; error. DEP Departure DEPART FROM HOVER (DHOV) A guidance mode providing lateral guidance, longitudina l guidance and vertical guidance for a set heading or bank angle, a set speed, a nd a set climb ... DEPARTURES The number of aircraft take-offs actually performed in domestic and i nternational scheduled and non-scheduled passenger/cargo and all-cargo revenue s e... DERIVATIVE Rate of change, usually with respect to time; Symbols: x dot, x prime , x sup (1), dx/dt, Dx; DERIVED Calculated values for which no direct measurement exists; Compare: estim ated, filtered, measured, raw, selected, smoothed DESALT Desired altitude DESIRED What must be achieved in order to match a plan; Synonyms: reference; DESIRED ALTITUDE (DESALT) A guidance control law parameter, generated by the ver tical guidance modes; altitude which controlled altitude is attempting to achiev e Typical Units:... DESIRED PATH A trajectory in space determined by guidance to meet the current mi ssion objectives; DESIRED SPEED (DESS) A guidance control law parameter, generated by the longitud inal guidance modes; speed which controlled speed is attempting to achieve Typic al Units: f... DESS Desired speed DEV Deviation DEVIATION Difference from desired; DEVICE A piece of equipment, a subsystem; Synonyms: physical device, unit DF Direction Finder DFAD Digitized Feature Analysis Data DFS Deutsche Flugsicherung AG DG Directional gyro DGNSS Differential GNSS DGPS Differential global positioning system. LA- prefix refers to local area DGP S; WA- prefix refers to wide-area DGPS signal retransmission schemes. DGT REN Differential GPS DH Decision Height DHOV Depart from hover DIALED IN Slang term for the condition in which the aircraft is set up to fly sm oothly and predictably. This is the state where the mechanics and electronics wo ... DIFFERENCE EQUATION Distance Measuring Equipment DIFFERENT EQUATION A mathematical relationship to model a continuous function, e xpressed in terms of derivatives; Initial conditions are usually given or implie d. In avi... DIGITAL MAP GENERATOR (DMG) Digital equipment that produces map video, and somet imes contains TRN; uses Digital Terrain Elevation Data and Digitized Feature Ana lysis Data; Displa... DIGITAL TERRAIN ELAVATION DATA(DTED) On a digital map, data for elevation of ter rain; DTED is usually provided by Defense Mapping Agency; Compare: Digitized Fea ture Analysis Data; DIGITIZED FEATURE ANALYSIS (DFAD) On a digital map, data for cultural features s uch as buildings and roads; DFAD is usually provided by Defense Mapping Agency; Compare: Digital Terrain... DIGITZER Any electronic device capable of converting information to a digital fo

rmat; usually refers to encoding devices that convert sensed altitude into a tr. .. DIHEDRAL The V-shaped bend in the wing. The upward angle of the airplane`s wings with respect to the horizontal. Typically, more dihedral causes more aerodynam. .. DIMENSIONLESS No units, such as ratios; Synonyms: unit less; DINA An American improvement of MANDREL airborne jamming device operating in the 95-210 MHz band. Also named PIPERACK when used to counter FuG 220 AI radar... DING Minor dent or damage to the structure. Also, a nick in a prop. Dinged props must be replaced. DIRECT Towards a point along the shortest distance; Compare: course DIRECTION bearing. DIRECTIONAL STABILITY The tendency of an aircraft to keep flying the direction i ts pointed. DIRTY Extension of gear, hook, flaps, etc. for slow speed flight or landing. DIRTY UP Extension of gear, hook, flaps, etc. for slow speed flight or landing. DISCRETE TIME Time divided into quantized intervals; in avionics, time is usuall y divided into equal intervals to create a periodic process; Compare: continuous tim... DISCRETE-TIME EQUATION A mathematical relationship to describe a function of tim e, expressed in terms of discrete time; Compare: continuous-time equation, diffe rence equatio... DISTANCE Method of measurement dependent on use; Synonyms: range; DISTANCE MEASUREING EQUIPMENT(DME) Equipment for measuring distance, usually fro m an aircraft to a ground station; usually part of a Tactical Air Navigation sys tem DISTRESS A condition of being threatened by serious and/or imminent danger and o f requiring immediate assistance. DITCH To land safely somewhere other than a runway. DIVERT To change from a scheduled landing base to an alternate airfield. DLA Delay (Message of an ICAO FPL) DME Distance Measuring Equipment. DMG Digital Map Generator DNS Doppler Navigation System DOF Distance Measuring Equipment DOMESTIC OPERATIONS Operations within and between: the 50 states of the United S tates, the District of Columbia, the Commonwealth of Puerto Rico, and the United States Vi... DOP Dilution of Precision (GPS) DOPPLER A technique for measuring velocity by radiating and determining frequenc y shift DOPPLER NAVIGATION SYSTEM (DNS,DPLR) A navigation for measuring velocity by radi ating and determining frequency shift; DORSAL FIN An extension of the vertical fin forward of the main part of the fin, and against the fuselage. On the top, or "dorsal" side of the aircraft. DOWN THRUST Downward angle of the engine relative to the centerline of the airpl ane. Down thrust helps overcome the normal climbing tendency caused by the torqu e ... DP Deal Pending DPLR Doppler navigation system DR Ded (deduced) reckoning. DRAG Force created by an airfoil moving through atmosphere, opposite to the dire ction of motion. The air resistance to forward motion. Drag can be increase... DRIFT Slow, monotonic change in measured data DRMS Distance root mean squared. DRUMSTICK Ground based interference with enemy WT transmissions in the 3-6 MHz b ands DSO Data source object DSP Data Processing DTED Digital Terrain Elevation Data

DTK Desired track DTU Data transfer unit DUAL RATES Radio function used to adjust control sensitivity. DUAT Direct User Access Terminal (US Computer Self-Briefing system) DUNKEL-NACHTJAGD - DARK NIGHT HUNT; German night fighter zone not backed by sear chlights DUPLES Separate channels for transmitting and receiving D PPEL The German version of WINDOW. Strips of silver paper dropped to confuse the ground radars E Airspace ICAO Class E EAA Experimental Aircraft Association EAD European AIS Database EAG European ATFM Advisory Group EANPG European Air Navigation Planning Group (ICAO) EARLY EXTENDED VALIDATION INTEGRATIONPROGRAM (EEVIP) An FAA program, first imple mented for the Boeing 777, to give "out-of-the-box" ETOPS clearance to a new pla ne, rather than waiting for a couple of yea... EAROM Electrically alterable read-only memory, a type of digital memory device. EART-REFERENCED FLIGHT PATHANGLE Angle in vertical plane of airspeed vector and groundspeed vector; usual definition for flight path angle; Compare: air-mass fl ight path angle; Symbol... EARTH COORDINATES Coordinates referenced to the earth; See Also: east-north-up; Compare: body coordinates, stability coordinates EARTH DATA Environmental data related to the earth at some point of interest; us ually a function of latitude and longitude EARTH ECCENTRICITY A measure of the degree to which the earth is oblate; Symbols : epsilon; EARTH MODEL The earth model computes data related to the earth. Most data is a f unction of position. Standard models are: International, Clarke 1866, Clarke 188 0,... EARTH RADIUS Radius of the earth, function of position, separate radii for longi tudinal radius and for lateral radius; See Also: state data; Symbols: rho; Typic al ... EARTH RADIUS BEST SPHERE Gaussian radius of curvature EARTH RADIUS EAST/WEST Prime radius of curvature EARTH RADIUS NORTH/SOUTH Meridian radius of curvature EARTH SPEED Total velocity measured with respect to a plane tangent to the earth `s surface at the current position; a vector composed of velocity north, velocit y ... EAS European Air Sports EASA European Aviation Safety Authority (planned to replace JAA) EAST-NORTH-UP (ENU) A standard earth coordinate frame and sign convention, where east, north, and up are positive; vertical, or V, is sometimes used in place of up; Synon... EAST-NORTH-VERTICAL (ENV) East-north-up. EATCHIP European Air Traffic Control Harmonization Implementation Project EATMP European Air Traffic Management Plan EATMS European Air Traffic Management System EATS Empire Air Training Scheme EBAA European Business Aviation Association EC European Commission ECAC European Civil Aviation Conference ("Association" of Europe`s CAAs) ECI Earth Centered Inertial ECM Electronic Counter-Measures. ECOGAS European Council of General Aviation Support EDF Electric ducted fan. A battery-powered fan (rather than exterior propeller) driven aircraft. EEC Euro control Experimental Centre EEPROM Electrically Erasable Programmable Read-Only-Memory EET Estimated Elapsed Time

EFATO Engine Failure At Take-Off (JAR-FCL) EFDP European Flight Data Processing EFIS Electronic Flight Instrument System EFTS Elementary Flying Training School EGNOS European Geostationary Navigation Overlay System EGT Exhaust gas temperature indicator. EHS Enhanced Surveillance (Mode S, 2nd step) EHSI Electronic Horizontal Situation Indicator EICAS Engine indicating and crew alerting system. ELBA Emergency Locator Beacon-Aircraft ELECTRIC STARTER A hand-held electric motor used for starting a aircraft airplan e engine. Usually powered by a 12-volt battery. ELEV Elevation ELEVATION An angle in the vertical plane through a longitudinal axis; height abo ve mean sea level, usually of terrain; ELEVATOR Pitch control. Causes the aircraft to raise or lower its nose, resultin g in a climbing or diving response. Moving the elevator down causes the tail to. .. ELT Emergency Locator Transmitter (crash-activated transmitter) EMC EATMP Management Committee EMIL ; Nickname for the Bf109E EMPENNAGE The vertical and horizontal tail surfaces of an airplane. EN ROUTE AIR TRAFFIC CONTROLSERVICES Air traffic control services provided aircr aft on IFR flight plans, generally by centers, when these aircraft are operating between departure and dest... ENCAL Encoding Altimeter ENCODER Displays aircraft`s altitude on ground-based radar screens. ENGINE The methanol or gasoline fueled power plant used in a aircraft. Two or fo ur-stroke gasoline and glow engines are very popular in aircraft. Four-stroke... ENGINE COWL A removable covering placed over and around an airplane`s engine. ENPLANEMENT A revenue passenger boarding an aircraft. ENPRM Euro control (European?) Notice of Proposed Rule Making ENU East-north-up ENV East-north-vertical ENVIRONMENTAL DATA Atmospheric data and earth data EOBT Estimated off-block time EP European Parliament EPOXY A two-part resin/hardener glue that is extremely strong. It is generally a vailable in 6 and 30-minute formulas. Used for critical points in the aircra... EQUIPMENT STATUS Operational status of a piece of equipment consisting of a stat us indicator and status words; Synonyms: health; ERA European Regional Airlines Association EROS Brand Name for Oxygen Mask ERPROBUNGS GRUPPE Luftwaffe formation for the evaluation of new tactics or techn iques ERROR Difference between desired and measured data; Synonyms: delta; ESA European Space Agency ESC Economic Social Committee ESTIMATED Data that is the result of filtering two or more signals; Compare: der ived, filtered, measured, raw, selected, smoothed ETA Estimated Time of Arrival. The time the flight is estimated to arrive at its destination. ETD Estimated Time of Arrival ETFMS Enhanced Tactical Flow Management System ETOPS Extended Twin-engine operations. FAA designation of over-ocean flights far from possible emergency landing strips, in which the possibility of engine ... ETSI European Telecommunication Standardization Institute EU European Union EUAPA European Union Airplane Pilots Association

EULER ANGLES Pitch, roll, and yaw EULER PARAMETERS Four parameters for specifying quaternion; Symbols: e sub EUR European Region EUROCAE European Organization for Civil Aviation Equipment EVEREST A standard model for computing earth data EXPANDED SCALE VOLTMETER (ESV) Device used to read the battery voltage of the on - board battery pack or transmitter battery pack. EXPANDIG SQUARE SEARCH A pattern of progressively larger squares (a "square spir al") followed for searching the ground from an aircraft; Compare: creeping line search, secto... EXPEDITE Used when prompt compliance is required to avoid the development of an imminent situation. EXPONENTIAL This radio function allows the air crafter to adjust the sensitivity of the control towards the center. This will make the small stick motions very pr... EXTENDED OVER-WATER OPERATION 1) With respect to aircraft other than helicopters , an operation over water at a horizontal distance of more than 50 nautical mile s from the nearest s... EXTERNAL-LOAD ATTACHING means the structural components used to attach an extern al load to an aircraft, including external-load containers, the backup structure at the attach... EXTROPOLATE Function to determine values from two or values in a table, when the given value lies outside of the range of the table; usually linear but can be h ig... F Airspace ICAO Class F FA Area Forecast (Meteo) FAA Federal Aviation Administration. FADEC Full authority digital engine control. FAF Federal Aviation Administration FAILSAFE A PCM function which moves servos to a pre programmed position if trans mitter signal is lost or corrupted. FAIRING A shaped area used to smooth out, streamline, or "fair", the joint betwe en two members of an airplane to reduce drag. A wing fairing joins the wing an.. . FANS Future Air Navigation System (an ICAO project group) FAR Federal Aviation Regulations. The laws under which airmen in the US fly. FAR 36 NOISE LEVELS In order to meet FAR 36 Stage 3 requirements, the maximum no ise level permitted is: *Take Off 89.0 EPNdB *Sideline 94.0 *Approach 98.0 FAWP Final Approach Waypoint FBO Fixed Base Operator FBO (FIXED BASE OPERATOR) The small but important building near the ramp and run ways of a small airport, from which airfield activity is coordinated. FCC Federal Communications Commission (USA) FCL Flight Crew Licensing FCM Flight Confirmation Message FCS Flight control system FD Winds and Temperature aloft Forecast FDE Fault detection and exclusion (GPS) FDP Flight Data Processing FDR Flight Data Recorder FDS Flight Director System FE Flight Examiner FEDERAL AVIATION REGULATION(FAR) 14 CFR FAR Part 91 - General Aviation (portions apply to all operators) 14 CFR FAR Part 103 - Ultra light Vehicles 14 CFR FAR P art 105 - Parachute Jum... FERRY FLIGHT A flight for the purpose of: 1. Returning an aircraft to base. 2. D elivering an aircraft from one location to another. 3. Moving an aircraft to and fr...

FFAS Free Flight Air Space (Euro control Definition) FFON Flight Phone FI Flight Identity (Code) - (Mode S Transponder) FIC Flight Information Center FIDGET Interference of enemy high frequency night-fighter transmissions. FIE Flight Instructor Examiner FIELD CHARGER A fast battery charger designed to work from a 12-volt power sourc e, such as a car battery. FIGURE 9 Can be an "official" competition maneuver, or a badly-done loop. When t he aircraft flies over the top of a loop and picks up too much speed, the momen. .. FILTER A device to alter a signal; software to alter a data steam; See Also: ave raging filter, band-pass filter, complementary filter, first-order filter, hi... FILTERED Data that is the result of filtering a signal; filtering is usually mor e sophisticated than smoothing Compare: derived, estimated, measured, raw, sele. .. FIN, VERTICAL FIN The fixed portion of the vertical tail surface. FINAL Used to mean an aircraft is on proper heading, descent rate, airspeed, and altitude during runway approach prior to landing, or to a target prior to w... FIO Flight Information Office FIR Flight Information Region FIRE RESISTANT (1) With respect to sheet or structural members means the capacit y to withstand the heat associated with fire at least as well as aluminum alloy in di... FIREPROOF (1) With respect to materials and parts used to confine fire in a desi gnated fire zone, means the capacity to withstand at least as well as steel in d ... FIRST-ORDER FILTER-ORDER FILTER A filter in which the output follows the input, only more slowly; It is usually implemented in software as a difference equation of period T. The firs... FIS Flight Information Service FIS-B Flight Information Service-Broadcast FISHPOND Device fitted to H2S to enable wireless operators to scan beneath the b ombers for night fighter attacks from below. FIX A determination of one`s position based on external data, such as a known te rrain point FIXED WING An airplane, as opposed to a rotary wing / helicopter; FL Flight Level, Altitude x100 = feet AMSL (FL 70 = 7000ft) at ISA FLAK Flieger Abwehr Kanonen. German anti-aircraft guns FLAME RESISTANT means not susceptible to combustion to the point of propagating a flame, beyond safe limits, after the ignition source is removed FLAMMABLE with respect to a fluid or gas, means susceptible to igniting readily or to exploding FLAP EXTENDED SPEED means the highest speed permissible with wing flaps in a pre scribed extended position FLAPS Hinged control surface located at the trailing edge of the wing inboard of the ailerons that act together to increase the lift characteristics of the ... FLARE The point during the landing approach in which the pilot gives an increase d amount of up elevator to smooth the touchdown of the airplane. This maneuv... FLASH RESISTANT means not susceptible to burning violently when ignited FLENSBURG ; (FuG 227) German air interception homing device. FLGHT PATH ANGLE (FPA) Angle in vertical plane of earth speed vector and grounds peed vector (usual definition), earth-referenced flight path angle; angle in ver tical plane o... FLIGHT BOX A special box used to hold and transport all equipment used at the fl ying field. FLIGHT CONTOLS Controls in a cockpit for flying an aircraft; primary flight cont rols are wheel, yoke, cyclic, pedals, throttle, and collective; secondary flight cont...

FLIGHT CONTROL SYSTEM (FCS) A primary flight control system or an automatic flig ht control system; FLIGHT DATA RECORDER (FDR) An electronic device that records aircraft maneuvers. Used in accident investigations. FLIGHT DIRECTOR System, usually software, that generates stick position cues fro m state errors - typically three cues:. pitch, roll, and throttle for fixed-wing and l... FLIGHT LEVEL (FL) A level of constant atmospheric pressure related to a referenc e datum of 29.92 inches of mercury. Each is stated in three digits that represen t hundre... FLIGHT PACK OR AIRBORNE PACK All of the radio equipment installed in the airplan e, i.e., Receiver, Servos, Battery, Switch harness. FLIGHT PHONE Air-to-ground telephone system. FLIGHT PLAN Specified information relating to the intended flight of an aircraft that is filed orally or in writing with an FSS or an ATC facility. FLIGHT SERVICE STATION (FSS) Air traffic facilities which provide pilot briefing , enroute communications and VFR search and rescue services, assist lost aircraf t and aircraft in e... FLIGHT VISIBILITY means the average forward horizontal distance, from the cockpi t of an aircraft in flight, at which prominent unlighted objects may be seen and identif... FLIGHTCREW MEMBER means a pilot, flight engineer, or flight navigator assigned t o duty in an aircraft during flight time. "Flight level" means a level of consta nt atmos... FLIGHTLINE Where aircraft are parked between missions. FLIR Forward-Looking Infrared FLOATS Long, canoe-shaped structures that allow an airplane to land on water. Th ey are not a part of the aircraft structure, but suspended below the fuselage... FLOS Forward Looking Infra-Red FLOWER an intruder sortie, usually by Mosquitoes, against German night-fighter a irfields during bomber operations. FLT Flight FLUTTER A phenomenon whereby the elevator or aileron control surface begins to o scillate violently in flight. This can sometimes cause the surface to break aw.. . FLUX VALVE A device to measure the earth`s magnetic flux; a compass FLY OVER A position update by flying directly over a known point FLYING BOAT The type of aircraft where the fuselage has the lower portion shaped like a power boat. The plane lands on water directly onto the fuselage. There m ay... FM Frequency Modulation. This describes the mode of transmission of radio signal from transmitter to receiver. FMCS Flight management computer system. FMD Frequency Modulation FMS Flight Management System FNPT Flight Management System FOCA Federal Office for Civil Aviation (Swiss CAA - see BAZL) FOD Foreign Object Damage FOG Fiber-optic gyro. FORE, FORWARD Towards the front. Used such as: "...the forward edge of the rib.. .", or as in: "...with fore and aft movement...." FOREIGN AIR CARIER means the carriage by aircraft of persons or property for com pensation or hire, or the carriage of mail by aircraft, or the operation or navi gation of... FOREIGN AIR CARRIER means any person other than a citizen of the United States, who undertakes directly, by lease or other arrangement, to engage in air transpo rtation FOREIGN AIR TRANSPORTAION means the carriage by aircraft of persons or property as a common carrier for compensation or hire, or the carriage of mail by aircraf

t, in commerce b... FORWARD ELEVATION A control surface used to tilt an airplane up or down and moun ted on the front rather than the rear of an airplane. FORWARD-LOOKING INFRARED (FLIR) Sensor equipment used to supplement AGR, extend the aircraft visual search capability and provide position information for guida nce and navigation upd... FPA Flight path angle FPL Flight Plan (for ATC) FPM Feet Per Minute. Unit of measure, used for ROC or sometimes speed. FREEDOM OF INFORMATION ACT (FOIA) The Freedom of Information Act (FOIA) allows a ll U.S. citizens and residents to request any records in possession of the execu tive branch of the feder... FREIJAGD The use of Bf109s in independent, (usually high altitude), fighter swee ps over southern Britain to divert Fighter Command`s response. FREQUENCY CONTROL The FCC has allowed the 72MHz (72.010 - 72.990) band to be use d for R/C aircraft operations. This band is divided up into many different chann els in w... FREYA :;; (FuG 221) A series of German early warning long range radars. FSDM feet per minute (vertical speed) FSDO Flight Standard District Office (FAA USA) FSS Flight Service Station FT feet (approx 0.3 Meters) FTD Flight Training Device (lower category "simulator") FTO Flight Training Organization (Flight School) FUA Flexible Use of Airspace FUEL The methanol/nitro methane/lubricant mix used to fuel aircraft engines. A h elicopter fuel mix has a higher concentration of lubricant to counter the l... FUG (FUNK GERT) a series of airborne homing devices used to illuminate MANDREL, M ONICA, H2S and ASV. Later modifications permitted their use as search radars for nigh... FULL DE-ICE Complete anti - and/or de-ice equipment installed on wings, tail, pr ops, and windshield. FULL PANEL All gyros necessary for instrument flight. FUSE Fuselage, main body FUSELAGE The body of an airplane. FVS Fliegerische Vor-Schulung G Acceleration force unit (1G = Earth Gravity G-H British two-station radio direction finding system used as a bombing aid G/S Glide slope receiver and indicator. G/S SEL Groundspeed select GA Go around GA General Aviation and Aerial Work (all non-commercial civil aviation) GAC General Aviation Center GAFOR General Aviation Forecast (Weather) GAIN Gyro sensitivity. When too low, the tail will not hold position well. When too high, the surface being dampened by the gyro will tend to wag, or hunt ... GAL Gallons (usually US 3.78 liter, may be Imperial 4.54 liter) GALLEY On-board meal service equipment. GAMA General Aviation Manufacturers Association (USA) GARDENING RAF codeword for mine laying by aircraft GAS DISCHARGE A type of luminescent digital display. GASSER Slang for a aircraft using a gasoline engine as a power plant. GAT General Air Traffic GATT General Agreement on Trade and Taxes GAUSSIAN RADIUS OF CURVATURE Radius of the earth for the best fitting sphere at a given position; Synonyms: earth radius best sphere; Symbols: rho sub G; Typica l Units: ft; Dimens... GBAS Ground Based Augmentation System (DGNSS/DGPS/LAAS) GCA Ground Controlled Approach ("Talk-down") GCI Ground Communication Infrastructure

GCLP Guidance control law parameter GCR Ground clutter rejection. GEAR Landing gear, the undercarriage and wheels of an aircraft. GEE RAF navigational aid which could provide the navigator with a fix from pulse s transmitted by three ground stations. Range approximately 300 miles. GEN General GENDEC General Declaration Customs Form see full size, download zipped form, GENERAL AVIATION That portion of civil aviation which encompasses all facets of aviation except air carriers holding a certificate of public convenience and nec essity ... GENERAL ELECTRIC (GE) Engine Mfr. GEO Geostationary Earth Orbit (Satellite) GEOCENTRIC LATITUDE Latitude measured with respect to horizontal through mass ce nter of the earth; Compare: astronomical latitude, geodetic latitude; Symbols: P hi sub C; ... GEODETIC LATITUDE Latitude measured with respect to normal to reference ellipsoi d; Compare: astronomical latitude, geocentric latitude; Symbols: Phi sub T; Typi cal Unit... GESCHWADER Luftwaffe formation approximately equivalent to a Wing, comprising 90 -120 aircraft divided into Gruppen, each of 20-30 aircraft. GFT General Flight Test (JAR-FCL) GHZ Gigahertz (1`000 MHz or 1`000`000`000 Hertz) GIMBALED INERTIAL SENSOR Accelerometers mounted to a platform which is free to r otate, with gyroscopes to measure rotation and servomotors to maintain a fixed a ttitude with re... GISELA German intruder operation when the night fighters followed the British bo mbers back to their bases GLD Glider GLIDESCOPE Angle approach a runway; Symbols: Gamma; Typical Units: rad, deg; GLITCH Momentary radio problem that never happens unless you are over trees or a swamp. GLOBAL POSITIONING SYSTEM (GPS) A navigation sensor based on satellites; A Globa l Positioning System (GPS) provides highly accurate navigation data: position, v elocity, and time refe... GLONASS Global Orbiting Navigation Satellite System (Russian GNSS) GLOW FUEL A Methanol based fuel, with a lubricating agent, used in most aircraft engines. Most aircraft fuels also use a percentage of nitro methane. GLOW HEATER This is the plug that is used to help ignite the fuel in a aircraft engine. The combustion of the fuel in the engine keeps the element hot between c yc... GLS GPS Landing System GLU GNSS landing unit. Provides precision GPS guidance to the runway in Category III operations. GM-P10 GM=Morocco, P10=Prohibited Area No. 10. GND Ground GNSS Global navigation satellite system. GO AROUND (GA) A basic guidance mode, providing lateral guidance, longitudinal g uidance and vertical guidance to climb then to accelerate, while maintaining a w ings-... GOLD CROWN Trade name owned by King Radio Corp. GPA Groupe Parlementaire pour l`Aviation GPADIRS Global positioning, air data, inertial reference system. GPH Gallons (US) per hour GPS Global positioning system GPS-DNS Global Positioning System GPS-INS GPS using INS GPWS Ground Proximity Warning System GRAS Ground Proximity Warning System GRAVITATIONAL ACCELERATION Acceleration caused by the force of gravity; Symbols: g; Typical Units: ft/s-squared, g; Dimensions: Length / Time-squared;

GRAVITY Force exerted by gravity; gravity sometimes includes effects of the eart h`s rotation; gravity is often treated as a constant, but for greater accuracy.. . GRID NORTH Standard aviation term. GRIVATION Symbols: nu sub g ; Typical Units: rad, deg; GROSS-BATTERIEN Large batteries of German anti-aircraft guns. GROUND AIR A/C unit to cool aircraft while on the ground. GROUND EFFECT The cushion of air that the aircraft rides on when close to the gr ound. This will decrease the amount of elevator needed to maintain a constant al titu... GROUND GROCER A jamming device used to interfere with FuG 202 and 212 AI radar GROUND SPEED The speed of an aircraft relative to the surface of the earth. GROUND TRACK ANGLE (GTA) Direction of ground speed vector with respect to true n orth; Synonyms: true track; Symbols: eta; Typical Units: rad, deg; GROUND VISIBILITY prevailing horizontal visibility near the earth`s surface as r eported by the United States National Weather Service or an accredited observer GROUNDSPEED The speed over the ground; earth speed projected to a horizontal pla ne; Symbols: V sub g; Typical Units: kt, ft/s; Dimensions: Length / Time; GROUNDSPEED SELECT (G/S SEL) A basic guidance mode, providing longitudinal guida nce to an operator selected groundspeed; GRUPPE subdivision of a geshwader, each group having 20-30 aircraft assigned GS Groundspeed. GSC Ground Speed GSM General Standard for Mobile Communication (Mobile phones) GTA Ground track angle GTWO Gross Take off Weight GUIDANCE System, usually software, that determines state errors of desired state minus current state, typically three states: heading, altitude, and speed; GUIDANCE CONTROL PARAMETER (GCLP) One of several parameters for the guidance con trol laws, generated by individual guidance modes; See Also: altitude error scal e factor, altitude integ... GUSTAV Nickname for the Bf109G GYRO A mechanical or electronic device which helps to stabilize the orientation of the aircraft by sensing rotation, and moving the appropriate servo to co... GYRODYNE a rotorcraft whose rotors are normally engine-driven for takeoff, hover ing, and landing, and for forward flight through part of its speed range, and w. .. GYROPLANE A rotorcraft whose rotors are not engine-driven, except for initial st arting, but are made to rotate by action of the air when the rotorcraft is movin ... GYROSCOPE (GYRO) An inertial device for measuring change of attitude (pitch rate , roll rate, and yaw rate); gyroscopes usually consist of a gimbled, rotating ma ss; gyr... H Helicopter (JAR-FCL) H24 Operating 24 hours H2S ? HACK An aircraft used for communications or recreational purposes. HAPPY VALLEY ; RAF nickname for the Ruhr industrial area. HB- Swiss nationality marks for aircraft registration HDG Heading HDG SEL Heading select HEADER TANK This is a small fuel tank used in line between the main tank and the carburetor. The purpose of the header tank is to ensure that the fuel fed to th e ... HEADING Direction on a compass that aircraft is pointed, measured with respect t o true north or magnetic north; Symbols: psi; Typical Units: rad, deg; HEADING ERROR A basic output from guidance to flight director, indicating the di fference between actual heading and desired heading; Symbols: DELTA psi; Typical Uni... HEADING HOLD This describes a type of Gyro which senses rotation, and maintains

direction. This is accomplished by sensing the rate of motion, and the time of m oti... HEADING LOCK Slang term for Heading Hold Gyro. HEADING SELECT (HDG SEL) A basic guidance mode, providing lateral guidance to an operator selected heading (magnetic heading or true heading, again, operator se lectable); HEALTH Equipment status HEINRICH German transmitter introduced to jam GEE. HEL Helicopter HELICOPTER A rotorcraft that, for its horizontal motion, depends principally on its engine-driven rotors. HELIPORT an area of land, water, or structure used or intended to be used for th e landing and takeoff of helicopters HELLE NACHTJAGD ILLUMINATED NIGHT HUNT; German night fighter system backed by se archlights HEO High Earth Orbit HERTZ (HZ) Cycles per second, used to describe radio frequencies; usually with t he prefix k for kilo (one thousand), M for mega (one million) or G for giga (one ... HF High Frequency radio equipment. HF COM High Frequency Communication. HG High Frequency HIGE Hover In Ground Effect HIGH-PASS FILTER (HPF) A filter that allows frequencies above a cutoff frequency to pass while attenuating frequencies below the cutoff frequency; HIMMELBETT FOUR POSTER BED; German radar-backed night fighter system. HIRF High intensity radiated field. HIRL High Intensity Runway Lights HIS Horizontal Situation Indicator HIT (OR TO BE HIT) Sudden radio interference which causes your aircraft to fly i n an erratic manner. Most often caused by someone turning on a radio that is on your freq... HITS Highway In The Sky (Flight/NAV display concept) HJ Operating hours during daylight HMI Human Machine Interface HOGE Hover Out of Ground Effect HOL Holidays (MON-TUE-WED-THU-FRI-SAT-SUN-HOL) HOLD To maintain some aspect (s) of aircraft state, such as heading, airspeed, a ltitude, pitch HOOK In the US Navy, a target cursor; HORIZONTAL STABILIZER (STAB) The horizontal tail surface at the back of the fuse lage which provides aerodynamic pitch stability to the airplane. HOT START An engine which has been running will tend to remain hot for a short t ime. During this period, it is possible to restart the engine by turning the cra ... HOUGH A standard model for computing earth data HOURS FLOWN The airborne hours in domestic and international scheduled and non-s cheduled revenue service, computed from the moment an aircraft leaves the ground u... HOVER The art of flying without moving. This can also be an illusion, depending on wind speed. For airplanes, this is a 3D maneuver also known as a "hanger"... HOVER HOLD (HVR SYM) A basic guidance mode, providing lateral guidance and longi tudinal guidance to maintain an operator selected north velocity and east veloci ty; if the ... HP Horsepower HPA High-power amplifier. HPF High-pass filter HQ Horsepower HUD Heads-up display HVR SYM Hover hold

HX Head-Up Display HYDRAULIC LOCK Hydraulic lock happens when the engine becomes flooded with fuel, to the point where the piston cannot compress it in the combustion chamber. Thi s can... HYSTERESIS A function in which the algorithm for computing output changes at def ined events or thresholds, such that output follows one path as input increases a... IACA International Air Charter Association IAF Initial Approach Fix IAOPA International Council of Aircraft Owner and Pilot Associations IAOPA-EUR IAOPA European Region IAS Indicated airspeed IAS-TFB Indicated Air Speed IATA International Air Transport Association IAWP Initial Approach Waypoint IBC Ils Back Course IBIT Initiated built-in-test IC Interrogator Codes (II and SI codes) ICAO International Civil Aviation Organization (a UN-Suborganisation) ICD Interface Control Document ID Identification IDL Interface Definition Language IDLE THRUST the jet thrust obtained with the engine power control level set at t he stop for the least thrust position at which it can be placed IDS Infrared Detecting Set IFF IDENTIFICATION FRIEND OR FOE. Equipment carried by aircraft of both sides wh ich issued a signal identifying it as friendly. IFPS Integrated Flight plan Processing System of Euro control IFPUV IFPS Validation System (offline Route Verification by Internet) IFR Instrument Flight Rules ("all" weather operations rules) IG (al) Imperial Ga llon (4,54 Liter) IFR AIRCRAFT/IFR FLIGHT An aircraft conducting flight in accordance with instrum ent flight rules. IFR CONDITIONS weather conditions below the minimum for flight under visual flig ht rules IFR OVER-THE-TOP with respect to the operation of aircraft, means the operation of an aircraft over-the-top on an IFR flight plan when cleared by air traffic co ntrol t... II Interrogator Identity (Code) - (Mode S Transponder) IINTERSTATE AIR COMMERCE the carriage by aircraft of persons or property for com pensation or hire, or the carriage of mail by aircraft, or the operation or navi gation of aircr... ILS Instrument Landing System. A precision instrument approach system, generally used to land at fields experiencing weather. ILS APPROACH Instrument Landing System ILS BACK COURSE (IBC) Operation of ILS in which the runway is approached in reve rse direction, giving only lateral guidance; Compare: ILS Front Course; ILS FRONT COURSE Operation of ILS in which the runway is approached in forward d irection, giving lateral, longitudinal, and vertical guidance; sometimes called ILS Com... IM Instrument Landing System IMC Instrument Meteo Conditions (weather requiring IFR flight) IMMELMANN A maneuver originally used to reverse direction in combat. The airplan e noses up and over onto its back. It then rolls upright and continues in the di ... IN inch IN-LINE ENGINE An engine in which the cylinders are mounted in a straight line o r else in two, connected at an angle. INCIDENCE The angle of one portion of a aircraft when compared to another portio n of the aircraft. For example, if the stabilizer is perfectly parallel to the g

... INCIDENCE METER Used to measure the angle of attack of an airfoil, can be used t o measure blade pitch, or paddle pitch. INCIDENT An occurrence other than an accident associated with the operation of a n aircraft, which affects or could affect the safety of operations. INDICATED AIRSPEED "" means the speed of an aircraft as shown on its pitot stati c airspeed indicator calibrated to reflect standard atmosphere adiabatic compres sible flo... INDICATED AIRSPEED (IAS) The speed of an aircraft as shown on its pitot static a irspeed indicator calibrated to reflect standard atmosphere adiabatic compressib le flow at sea ... INDICATED ALTITUDE The altitude as shown by an altimeter. INERTIAL Based on inertia, such as with an INS or an AHRS INERTIAL NAVIGATION SYSTEM (INS) A totally self-contained system which requires no information from outside references. Provides aircraft position and navigatio n information in respon... INERTIAL NAVIGATION UNIT (INU) A self-contained Inertial Navigation System; INFRARED DETECTING SET (IDS) Forward-Looking Infrared; INHG inches of Mercury (unit of pressure) INITIALIZATION A basic control to a data source from controls and displays for i nitializing a device. Initiated by power-on, operator, driver, or MC; During ini tiali... INITIATED BUILT-IN-TEST (IBIT) Self tests running internal to a device initiated external to the device, usually an operator, causing the device to temporarily cease normal operatio... INNER MARKER Innermost marker beacon on an ILS INS Inertial Navigation System INSTRUMENT means a device using an internal mechanism to show visually or aurall y the attitude, altitude, or operation of an aircraft or aircraft part INSTRUMENT FLIGHT RULE (IFR) A set of rules governing the conduct of flight unde r instrument meteorological conditions. INSTRUMENT LANDING SYSTEM (ILS) Inertial Navigation System INSTRUMENT METEOROLOGICAL CONDITIONS(IMC) Meteorological conditions expressed in terms of visibility, distance from clouds, and ceiling less than minima specifi ed for visual meteorological con... INSTRUMENT OPERATIONS Arrivals or departures of an aircraft in accordance with a n IFR flight plan or special VFR procedures or an operation where IFR separation between air... INSTRUMENTATION Hardware to measure and to monitor a system INT Interior INTAKE An air inlet on an aircraft. You can have a carburetor intake, cooling in take, air conditioning intake (on full-size aircraft), and so on. Named becau... INTEGRATE To combine multiple systems; Also, to compute to integral of; INTEGRATED AVIONICS COMPUTER(IAC) Central processor of a Honeywell integrated co ckpit system. INTEGRATED AVIONICS PROCESSINGSYSTEM (IAPS) Central processor of a colins integr ated cockpit system INTEGRATOR A function that integrates; Many types of integrators exist; in fact, they constitute entire books. Avionics software usually relies on rectangular, s... INTERNATIONAL A standard model for computing earth data INTERPOLATE Function to determine intermediate values from two or values in a ta ble; usually linear but can be higher order; endpoints are either extrapolated o r ... INTERROGATION A request of data INTERSTATE AIR TRANSPORTATION means the carriage by aircraft of persons or prope rty as a common carrier for compensation or hire, or the carriage of mail by air craft in commerce: (... INTLIM Path integral limit

INTMAGLIM Altitude integral limit INTRASTATE AIR TRANSPORTATION means the carriage of persons or property as a com mon carrier for compensation or hire, by turbojet-powered aircraft capable of ca rrying thirty or mor... INTVAL Path integral value INU Inertial Navigation Unit INVALID An indication that data from a device is bad and cannot be trusted INVERTED Flying upside down. Note that elevator and rudder seem to work backward from the ground, as elevator, aileron and rudder inputs are all based upon the. .. IPG Inertial Navigation System IPPL National (ICAO) Private Pilots License (AOPA internal abbreviation) IR Instrument Rating IRE Instrument Rating Examiner ISA ICAO Standard Atmosphere ITC Investment tax credit. ITU International Telephone Union, refers to certain HF channels. ITW Initial Training Wing (Ground School) IVSI Instantaneous vertical speed indicator. JAA Joint Aviation Authorities (CAA of Europe) JABO (JAGDBOMBER) Bf 109s converted to carry 250Kg bombs and carry out nuisance raids. A very effective tactic. JAGD GESCHWADER Luftwaffe day fighters JAGDSCHLOSS Rotating long range early warning radar JAR Joint Aviation Recommendation (as used in some JAA documents, reported false !) JAR-1 JAR on Definitions and abbreviations JAR-145 JAR on Approved Maintenance Organizations JAR-147 JAR on Maintenance Training JAR-22 JAR on Sailplanes and Powered Sailplanes JAR-25 JAR on Large Airplanes JAR-36 JAR on Aircraft Noise JAR-APU JAR on Auxiliary Power Units JAR-AWO JAR on All Weather Operations JAR-E JAR on Engines JAR-FCL JAR on Flight Crew Licensing JAR-MED JAR on Medical JAR-OPS JAR on Flight Operations JAR-P JAR on Propellers JAR-TSO JAR on Technical Standard Orders JAR-VLA JAR on Very Light Airplanes JERK Rate of change of acceleration, either scalar or vector, often with subscri pts such as ENU or XYZ to denote the coordinate frame; time derivative of a... JET PROP Describes aircraft using turbine engines to drive propellers. JET STREAM A migrating stream of high-speed winds present at high altitudes. JET-A1 Jet Fuel type A1 JOSTLE British airborne jamming device to disrupt enemy RT transmissions. JPPL JAR-FCL Private Pilots License (AOPA internal abbreviation) JSA Joint Steering Assembly (JAA) JUG Nickname for the P-47 JURG Joint User Requirement Group K Airspace Euro control Project Class K (all traffic known) KALMAN FILTER A filter for putting together multiple data sources, of different types, to return an estimate better than any one source; KALTINT Altitude integral advantage. KAMMHUBER-LI RAF nickname for the zonal system of air defense set up by General Joseph Kammhuber. KAMPF GESHWADER; Luftwaffe Bomber wing KIAS Knots Indicated Air Speed; IAS, in knots. KINT Path integral gain

KIT A Kit is an unassembled aircraft, it arrives as packages of parts it must be assembled, as opposed to an ARF; Almost Ready to Fly, which is mostly pre... KITE means a framework, covered with paper, cloth, metal, or other material, int ended to be flown at the end of a rope or cable, and having as its only sup... KLA Reference Acceleration Gain. KNICKEBEIN German radio beam/beams used to guide bombers to their targets. KNOT One nautical mile/hour, which is about 1.15 stature miles/hour. KNOWN ICING FAA certified to fly into icing conditions. KORFU (FuG 351) German ground radar often used to produce fixes on the bombers H 2S equipment. KOSIF knots Indicated Air Speed. KPH Kilometers/hour KPI Key Performance Indicator (KPI) KT(S) knots true air speed (KT) KTAE Track angle error gain (KTAE) KTAS Knots True Air Speed (KTAS). TAS, in knots. KVSF Velocity error scale factor (KVSF) KXTKD Cross track deviation gain (KXTKD) KXTKR Cross track deviation rate gain (KXTKR) KZSF Altitude error scale factor (KZSF) L-BAND A radio frequency between 890 and 1550 MHz. LAAS Local Area Augmentation System (LAAS) LAHSO Land And Hold Short Operation. (to cross intersecting runway). LANDING GEAR (LG) The assemblies this includes the wheels and the wheel struts. LANDING GEAR EXTENDED SPEED the maximum speed an aircraft can be safely flown wh ile the landing gear is extended LANDING GEAR OPERATION SPEED the maximum speed at which landing gear can be exte nded or retracted safely. LANDING SKID The rail type landing equipment used aircrafts which have no wheels . LAPLACE TRANSFORM A mathematical relationship to model. A continuing function in the complex frequency domain (S-plane). Laplace transforms are usually used by systems ... LARGE AIRCRAFT Aircraft of more than 12,500 pounds. Maximum certificated takeoff weight LASER IRS An inertial reference system getting angular rate information by measu ring doppler shift between two counter-rotating light beams. LASER OBSTACLE AVOIDANCE/TERRAINAVOIDANCE SENSOR (OA/TA) A sensor that warns for long, thin objects (IE: like wires); it has at least a 20deg x 30deg FOV. Itis both velocity tracked and pitch stabilized; it ... LAT Latitude LATERAL Related to latitude; across an aircraft left to right LATERAL AXIS The axis about which an aircraft pitches, extending out along each wing. LATERAL CONTROL The ability to make an airplane roll, or turn around its l