AIR INDIAAVIONICS SUB SYSTEMS

Submitted by :SHIVI SHARMAA4717209007

PROXIMITY SENSORTo detect presence of nearby

objects.Emits an electromagnetic field or

a beam of electromagnetic radiation

Looks for changes in the return signal.

Applications : 1. Doors2. Landing Gears3. Flight Controls

Significance :1. Safety2. Realiability3. Life

As defined by International Civil Aviation

Organization (ICAO)

INSTRUMENT LANDING SYSTEM (ILS)

LOCALIZER TRANSMITTER frequency range :108.10MHz to 111.95MHz ,provide horizontal data.

GLIDESCOPE TRANSMITTER frequency range : 329.15MHz to 335MHz provide vertical guidance data.

OUTER MARKER - normally located 4-miles from the runway threshold. Give two Dashes/second.

MIDDLE MARKER is located 0.5-miles from the runway threshold. Give a Dot-Dash pair 95 times/minute.

INNER MARKER is located 0.1-miles from the runway threshold. Give six Dots/second.

RETRACTABLE LANDING LIGHTS

S.No. PARAMETER IDEAL VALUE

ACTUAL VALUE

1 Extension angle 88o-90o 89o

2 Extension ProcessA). Time TakenB). Motor current consumptionC). Lamp current consumption

<10 seconds<2.4

Amperes<6.5

Amperes

8 seconds1.2 Amperes5.9 Amperes

3 Retraction ProcessA).Time TakenB).Motor current consumption

 10 seconds

1.95 Amperes

9 seconds1.6 Amperes

•Quantity : 2•Power : 600W•Range : 1.5-2 Kms (approx.)•Location: Beneath wings, near fuselage.

DISTANCE MEASURING EQUIPMENT (DME)

Ground Based + Airborne Equipment to measure the distance of the aircraft from a ground station

For Position Fixing, Approach to an Airport and Figuring Ground Speeds.

The Airborne DME consists of a Receiver-Transmitter (RT), a Control Unit, a Distance Indicator and an Antenna.

OPERATIONThe RT of the airborne DME transmits.The ground station receives these pulse pairs,

delays 50 µs, and then transmits a coded reply pulse pairs back to the airborne DME-RT.

D = {(T – 50 µs)/12.359} WhereT = Time in µs b/w transmission of

interrogation pulse pair an reception of corresponding reply pulse pair.

50 µs = Delay at ground station b/w reception of DME interrogation & transmission of reply.

12.359 = Time in µs for RF energy to travel one nautical mile and return.

EMERGENCY LOCATOR TRANSMITTER (ELT)

Device to detect the aircraft after it has been crashed.

Gets activated automatically with the longitudinal thrust of 5g for 55ms.

Transmits the standard swept tone on 121.5MHz and 243.0MHz. The 406.025MHz transmitter turns on every 50 seconds for 440 milliseconds (standard short message) or 520 milliseconds (optional long message).

406MHz transmitter produces a much more accurate position(1 to 2 Km).

Other information transmitted : Type of the aircraft.Address of the owner etc.

AIR CONDITIONING SYSTEM

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