Noorul Islam College of EngineeringShort & Long Questions

Department of Aeronautical EngineeringAE-1012 Aircraft Transportation and maintenance management

April - 2011SHORT QUESTIONS

1. What does Annex.18 and Annex.13 of ICAO stand for?Annex.18 states “The Safe Transport of Dangerous goods by Air”.Annex.13 states “Aircraft Accident and Incident Investigation”.

2. What do you mean by SARP?It means “Standard and Recommended Practices”. SARP’s cover all technical and operational

aspects of international civil aviation such as safety, personnel lisensing, operation of A/C,aerodynamics etc.

3. Draw the structural diagram of ICAO.UN

ICAO

(1) Assembly (2) Council of limited (3) Secretariate isMembership Bureau of

(189 country) (36 states)

Air Technical Air Legal Administration

4. Draw the structural diagram of Airlines operational management.

They contribute to Airlines and Airlines gives service to passengers and transport goods.

A/C manufacturer

Leasing Companies

Air traffic control

Airport

Government Authorities

AIRLINES Passengersand Goods

5. What do you mean by “Open skies” agreement?Open skies means unrestricted access by any carrier into sovereign territory of country without

any written agreement.Thus in theory when the skies are open, any foreign airline can choose any route and can land any

aircraft at any airport, with no restrictions. (eg.) EU (Europe) i.e. Common Air space under commonsecurity and safety rules.

6. What do you mean by Cambotage?Cambotage means right to move passengers on a route from a home country to destination country

that uses more than one stop along which passengers may be loaded and unloaded.

7. What do you mean by On demand Air transportation?On demand Air transportation: The transportation of passengers and cargo by aircraft from one

point to another when requested or needed. It is a non scheduled Air transport.

Personal / Business /Cargo

8. What does DGCA, BCAS and AAI stands for?DGCA – Director General of Civil Aviation.BCAS – Bureau of Civil Aviation Security.AAI – Airport Authority of India.

9. Define Airworthiness.Airworthiness means meeting the civil Aviation authority established standards for safe flight and

equipped and maintained in a condition to fly.

10. What is the concept of international multi- media transport?The concept of international multi-modal transport covers the door-to-door movement of goods

under the responsibility of a single transport operator. Combining different mode of transport such asrail, road, sea, Air etc. we can boost the global economy by reducing time.

11. Differentiate between amortization and depreciation.Amortization is intangable assert (valuable goods) cost over the duration of its useful life.

(Intangable – good will, brand etc.)Depreciation is a process by which a company allocates a tangible assert cost over the duration of

its useful life. (Tangable – machines, building, land etc.)

12. What is the role of Civil Aviation authorities? Name any five.

CivilAviation

CommercialAir Transport

GeneralAviation(commercial& private)

NonScheduled

The CAA is the name for the national body governing civil aviation in a number of countries.CAA provides: Personal Licensing / Flight Operations / Airworthiness / Aerodromes / Air traffic

services / Safe sky etc.Eg. (i) DGCA – India

(ii) EASA (European Aviation Safety Agency) – EU (European Union)(iii) FAAT (Federal Agency of Air Transport) – Russia(iv) FAA (Federal Aviation Administration) – USA(v) CASA (Civil Aviation Safety Authority) – Australia

13. What do you mean by AMO, TC and EO?“AMO” means Aircraft Maintenance Organization.“TC” means Task Cards.“EO” means Engineering Order.

14. Differentiate between functional and operational checks.Functional Check: A quantitative check to determine if each function of an item performs within

specified limits. This check require use of auxiliary (outside) equipment.Operational Checks: A task to determine if an item is fulfilling its intended purpose. This is a

failure – finding task and does not require outside equipment.

15. What do you mean by “Bottom up” and “Top down” approach for maintenance?“Bottom up” approach: It looks at the component as the most likely causes of equipment

malfunction.“Top down” approach: It looks at the consequence of failure i.e what caused the problem.

16. What is AOG?AOG means Aircraft on ground. An aircraft out of service (i.e. grounded) waiting for a part or

parts before it can be returned to service.

17. Define “Down time”.The length of time lost during an operation because of non – scheduled stoppages such as failure,

delay etc.

18. What do you mean by “MRO”?MRO means maintenance Repair and Overhaul.

19. Write a brief note on line personnel.They include everyone directly involved in producing or selling an airline services. Mechanics (M & E) Dilects (Flight operations) Flight attendants Sales & Marketing

20. What do you mean by span of control in level of management?This concept states that a supervisor or manager can effectively supervise or control three to

seven people.

21. What do you mean by deregulation? After deregulation, what still remains regulated?Deregulation means freedom to operate by anyone. It gives free market competition. It was

applied to Air Cargo and passengers.What remains regulated:

Bilateral agreements between international air services. Open sky agreements. Safety can never be deregulated. Its always under full control of government.

22. What is GDP and GNP and how its related to transportation?GDP is gross domestic product. It is a measure of the total value of goods and services

produced by a domestic economy during a given period, usually one year.GNP is gross national product. It is the total market value of goods and services produced

during a given period by labor and capital supplied by residents of a country, regardless of where thelabor and capital are located.

In many developed countries, transportation accounts for between 6% and 12% of theGDP. And transportation contributes about 20% of the total GNP of the nation.

23. Differentiate between Macro and Micro economics.Macro economic: The importance of transportation for a whole economy.Micro economic: The importance of transportation for specific parts of the economy.

24. What do you mean by yield management?The process of finding the right mix of fares for each flight is called as inventory or revenue

management. When to do discount When to do overbooking Should we have First class, Business class and Economy class etc.

25. What do you mean by code sharing agreements?Code sharing agreements can be between a larger airlines and reginal airlines or foreign airlines.

It allows two different airlines to offer better co-ordinated services to their customers. In this acarrier simply hands off passengers to another carrier to get the passenger to destination under samecode.

26. What is fleet assignment and A/C routing?Planning process of large airline companies require fleet assignment and A/C routing. First,

flight schedule is determined based on forecasts of passenger demand, available airports and otherinformation. Then specific type of A/C is assigned to the individual flights of the schedule providingrotation of flights in each fleet. This process is termed as fleet assignment and aircraft routing.

27. Differentiate between “Airline Revenue” and “Airline Cost”.Airline Revenue – “where the money comes from” i.e. passengers / cargo / domestic travel /

international travel.Airline Cost – “where the money goes” i.e. flying operations as fuel / maintenance / ATC /

promotion passenger service / Administration / Depreciation / Amortization.

28. What do you mean by budgeting?Budgeting is to minimize airline cost i.e. where money goes and to “increase airline revenue”.

The material manager of M & E organization along with CEO of airlines makes the budgeting forairlines.

29. Explain Fixed and Variable direct operating cost. How are they related to indirect operating cost?Direct costs in airline are those which are related to the A/C. They are “fixed” (depreciation,

internet, insurance) and “variable” (crew, fuel, maintenance, ATC charge etc.)Indirect costs are those related to the airline itself (sales, advertising, passenger service)

30. What is utilization?Utilization is total flying per year or total flying per day. A high amount of utilization will result

in low hourly charges for depreciation and make it easier to earn profits or to cut fares.

31. Explain different types of international tariffs.International tariffs are framed by IATA but big Giant Airlines do make their own tariff.

Types of international Tariffs are, First class fares Business class fares Economic class fares Preferential fares Promotional fares

32. What is the difference between Airline production and Load factor? How does CRS affect the loadfactor?

Airline production = Seats offered x Distance = Seat – Km.Passenger load factor = Passenger – Km

Seat – KmComputer reservation systems (CRS) have raised the average load factor expected by scheduled

service airlines.

33. Who should have control of material – maintenance or finance?Maintenance of M & E organization.

34. How is material in airlines functioning?Material is one of the key units within an airline’s M & E organization.Its function involve, Ordering of parts and supplies. Storing of parts and supplies. Controlling of parts and supplies. Handling of parts and supplies.

35. What is the relation between budgeting and material?Material is the one the spends the most money in Airlines. It formulates budget with respect to

inventory control, stores, purchasing, shipping and receiving. Material under the control of M & Eorganization makes budgeting.

36. Define Human Factor.Human factor is the scientific discipline concerned with the understanding of the interactions

among humans and other elements of a system, starting from design process to the human use.

37. Define LPG and how it affects global economy?LPG means Libralization, Privatization and Globalization.

More airlines, more compitition, more air traffic, more GDP, Technology growth all because ofLPG.

38. Differentiate between proportional fares and preferential fares.Preferential fares are low type of fares offered to children, young people and senior citizen and to

military personnel, diplomats etc.Proportional fares are special schemes given by airlines to passengers in proportion to demand.

39. What costs are involved in flight operations?Flying operation involves,

Crew salaries and expenses. Fuel and oil. Insurance.

40. Differentiate between flight crew and ground crew. How do they assist each other?Ground crew is the support crew supplying the A/C with fuel and maintenance.Flight crew are pilots, flight attendants, flight engineers etc. who fly with A/C.

Both are two pillars of airlines.

41. Differentiate between visual and transit checks.Visual check: An observation to determine if an item is fulfilling its intended purpose. This is a

failure finding task.

42. How do hourly checks differ from letter checks?Daily checks: A maintenance check performed every day or any time the aircraft has sat on the

ground for more than 4 hours. For recent A/C models, this has been changed to a 48 hour interval.Letter checks: Standard check cycles done after certain flight hours, flight cycles or calendar

time. Usually named as A, B, C, D.

43. Differentiate between MEL and MMEL.MEL (minimum Equipment List) – A list of equipment that flight crews agree to accept as in

operative for short periods. Operators create the MEL.MMEL (Marter Minimum Equipment List) – Marter list of MEL items. Includes all related items

available for the A/C type whether installed on operator’s vehicle or not. Manufacture creates theMMEL

44. Differentiate between routine maintenance and non routine maintenance items.

The basic maintenance checks have task requirements for various inspections, functional checksand operational checks of A/C equipment. They are called routine maintenance items and requirefixed amount of time to be carried out.

The requirements in skill, parts, supplies and time can vary considerably depending on the natureof the malfunction found. These are called non routine items and by nature can extend the down timeneeded.

45. Define Redundancy and Reliability. How are they related to each other?Redundancy: The use of two or more items in parallel to ensure full support in case one unit fails.Reliability: The probability that an item will perform a required function, under specified

condition without failure, for a specified amount of time. With redundancy the reliability increases.

46. Talking about parts availability, what is “Chasing parts” and “JIT”?Chasing parts: Depending on which parts and supplies will be needed for routine and non routine

work, the mechanic has to do the chasing of parts.JIT: Material delivers parts and supplies it to hanger Just In Time (JIT) for maintenance to use

them.

47. What is “MCC”? Also define “PIREPS”.MCC – Maintenance Control Center. The hub of maintenance activities on the flight line for in-

service aircraft.PIREPS – Pilot report i.e. a log book entry or other report by a flight crew member concerning

an aircraft malfunction.

48. What does abbreviation “A & P”, “AC”, “AD”, “SB”, “SD”, “SL” stands for? “A & P” means Airframe and Power plant. “AC” means Advisory Circular. “AD” means Airworthiness Directive. “SB” means Service Bulletin. “SD” means Standard Deviation about mean value. “SL” means Service Letter.

49. Differentiate between “TC”and “C of A”.“TC” – Type certificate is a certificate issued by Civil Aviation Authority of country of

manufacturing the A/C.“C of A” – Certificate of Airworthiness (in India) or AC (Airworthiness certificate, FAA). C of A

is issued by DGCA to each aircraft built to assure that it was built to TC standard.

50. Differentiate between NDI and NDT.NDI – Non Destructive Inspection is an inspection technique that does not change the unit being

inspected.NDT – Non Destructive Testing is a testing technique which does not change the unit under test.

51. What are the structural damage the A/C go through? Environmental deterioration. Accidental damage. Fatigue damage.

52. What is flight plan? How are they scheduled?Flight plan are document filed by pilots with local Civil Aviation Authority prior to departure.

They include information such as departure and arrival point, estimated time en – route, alternateairport etc. Flight plans are scheduled according to the availability of routes in coordination withATC.

53. Differentiate between scheduled and unscheduled maintenance.Scheduled Maintenance: Simple maintenance and / or servicing activities designed to maintain

the inherent level of safety and reliability of a system and done at specified intervals.Unscheduled Maintenance: Maintenance performed to restore an item that has failed or

deteriorated beyond usable levels to its inherent level of reliability and safety.54. What is NFF?

NFF means No Fault Found while shooting.

55. What do you mean by LRU?LRU means Line Replaceable Unit. An LRU is a component or system that has been designed in

such a manner that the parts that most commonly fail can be quickly removed and replaced on thevehicle.

56. What do you mean by Lubrication?An act of replenishing oil, grease or other substances used for the purpose of maintaining the

inherent design capabilities of a unit or system by reducing friction and / or removing heat.

57. What is overhauling?The disassembly, inspection and / or check of an A/C, component, engine or appliance to an

extent necessary to determine that it is in satisfactory condition to operate one complete overhaulperiod.

58. Differentiate between MSI and SSI.MSI means (Maintenance Significant Item) – An item, determined by the manufacturer, would

be hidden from the flight crew, or would have an operational or economic impact.SSI means (Structurally Significant Item) – Any detail element or assembly which contributes

significantly to A/C loading and whose failure could affect the structural integrity necessary forsafety of the aircraft.

59. Differentiate between inspection, visual inspection and zonal inspection.Inspection: An examination of an item and comparison against a specific standard.Visual inspection: A visual examination that will detect obvious, unsatisfactory conditions or

discrepancies.Zonal inspection: Several visual inspection tasks performed in a specific area (zone) of the A/C.

60. What is “Back shops”?Another name for overhaul shops for maintenance and repair of off - A/C equipment.

61. Differentiate between block time and flight time (flight hours)?Block time (Block hours) – Hours measured for the time A/C leaves the gate to the time A/C

stops at the destination gate.

Flight time (Flight hours) – Actual flight time measured from take off to landing.

62. What do you mean by reliability centered maintenance (RCM)?

Failure rate

(1) (4)

Time

(2) (5)

(See Page No.10)

(3) (6)

1,2,3 follow HT & OC 4,5,6 follow CMi.e. Hard time and on condition i.e. condition monitoring

63. Which among HT, OC, and CM is unscheduled maintenance? Give example for each.HT is scheduled and failure preventive [e.g. landing gear overhaul]OC is scheduled and failure preventive [e.g. boroscopic inspection of engines]CM is unscheduled and until failure [e.g. navigation and communication equipment]

64. What is walk around inspection?At stations where no maintenance is available, the flight crew will do a walk – around inspection

i.e. they will perform a transit check consisting of oil check, visual inspection.

65. What are the five objectives of an airline maintenance program?(i) To ensure safety and reliability level of equipment.(ii) To restore safety and reliability level of equipment.(iii)To obtain necessary information, data etc for adjustment of maintenance program when

inherent levels are not met.(iv)To obtain information for design improvement.(v) To do this maintenance at minimum cost.

66. How is “no data” related to false alert?Some time “no data” i.e. when equipment was not in service, is taken as no failure. The no

failure gives us the overall mean value or false. And thus getting false alert level.(e.g.) weather radar work only two months and is not needed for 10 months.(See page 203)

67. What do you mean by “Economic useful life of A/C or engine”?Economic useful life of A/C or engine is the period of time over which it is physically and

economically feasible to operate it in its intended role.

68. Differentiate between A/C operating cycle and total flight time.A/C operating cycle: A complete flight sequence including taxi, take off, flight en-route and

landing. For engines it is starting, accelerating to maximum rated power, decelerating and stopping.Total flight time: is the operating time that an A/C, engine or component has accumulated since

new.

69. What is dispatch reliability?Dispatch reliability is a measure of the overall effectiveness of the airline operation with

respect to on-time departure.

70. What is the data for reliability? Flight time and cycles of each A/C. Cancellation and delays over 15 minutes. Unscheduled component and engine removals. IFSD PIREPS etc.

71. What do you mean by hanger deluge system?Hanger deluge systems are with tanks of fire retardant chemical buried in the ground or beneath

the hanger floor. This chemical mixes with water to form a foam and disperses it throughout thehanger.

72. What do you mean by inherent reliability?The “designed-in” reliability of a component or system is called inherent reliability.

73. How are MPRB, MRB and MRBR related?MPRB is maintenance program review board.MRB is maintenance review board.MRBR is MRB report.

74. Differentiate between hidden and evident failure.Hidden Failure: A failure of an A/C system or component that is not evident to the flight crew.Evident Failure: A failure of an A/C system or component that is noticeable to the flight crew.

75. How is CM related to HT and OC monitoring?Condition Monitoring (CM) – A primary maintenance process for items that do not have

characteristics that would allow the establishment of HT or OC intervals to determineserviceability. CM items are operated to failure.

76. What is a critical failure?

Failures involving a loss of function or secondary damage that could have an adverse effect onoperating safety.

77. What is EROPS?EROPS means extended range operation. Flight operations at a distance more than 60 minutes.

flying time with one engine inoperative from the route to enroute airport. EROPS works regardlessof number of engines. It has been replaced by ETOPS (Extended Twin Engine Operations) whichworks only for two engine A/C.

78. Differentiate between Accidental Damage, Environmental Deterioration and Fatigue Damage.Accidental Damage: The physical deterioration of an item caused by contact or impact.

E.g. Rough landing caused impact on landing gears.Environmental Deterioration: The physical deterioration of an item’s strength or resistance to

failure as a result of chemical interaction with its environment.Fatigue Damage: The initiation of a crack or cracks due cyclic loading and subsequent

propagation of such cracks.

79. What is the normal aging life of A/C?20 years of economical life.

80. What is “TBO”? How is it expressed?The maximum time that an item is permitted to operate between overhauls. TBO’s are usually

expressed in flight hours, cycles or calendar increments.

81. What is progressive maintenance program?Progressive maintenance program is one which provides for the complete inspection of an A/C

with in each 12 calendar months, in compliance with manufacturing and CAA.

82. Draw block diagram showing equipment and tools for A/C maintenance.(Refer to question no.88)

83. What is the function of maintenance safety?Maintenance safety: Makes safety program. Health matters. Safety equipment.

84. What do you mean by inventory control?Inventory control maintains proper stock levels in stores and initiates recorder on proper time.

85. Differentiate between line station and out station.Any maintenance activities at stations that are not the home base of airline are called out

stations or line stations. Line stations have limited personnel and skills, limited availability ofparts and supplies, limited facilities. E.g. hanger space etc.

Out stations include the contracting of maintenance personnel on site for effecting repairs andfor servicing the A/C.

86. What do you mean by production control?The PP & C planners control the production by two factors:

Part knowledge of work to be done. Parts, manpower and facilities available when needed.

87. What is Quick Engine Change (QEC)?A QEC is a collection of components and accessories such as pumps, generators, thrust

reverser, nose cowl, fluid lines installed etc. on to a bare engine to speed the eventual installationof the entire power plant on to an A/C.

88. Name some ground support equipments.

Some GSE are: Wheel chocks / Tow bars / Jacks / Pneumatic air start unit / Battery chargingequipment / O2 servicing equipment etc.

89. What is “Shop Visit”?An engine removal is classified as shop visit.

90. Give the guidelines for human factor design.(i) Design the system to be compatible with human abilities, capabilities, need and strength.(ii) Design the system to compensate for human failings and deficiencies to avoid human errors.(iii) Provide human elements of the system with sufficient education and training.

91. What is mid time or mid life or half time or half life?Mid time or half time implies that,

The status of scheduled inspection or overhaul is midway through. The item has been in service for one half of their life limits.

92. What are basic elements of continuous maintenance program?

Ground support equipment & tools

Facilitation ofmaintenance

Airport &TerminalEquipment

Airlineequipment

Linemaintenance

Managermaintenance

Servicing andhandling of A/C

A/C inspection. Scheduled maintenance. Unscheduled maintenance. Repair and overhaul (Engine). Structural inspection and overhaul Airframe). Maintenance manual.

93. What are ACARS and FANS? How are they related to future maintenance?ACARS means A/C communication addressing and reporting systems.FANS means Future A/C navigation systems.

They can monitor and report about A/C engines and system performance before hand to themaintenance department.

94. How is a typical 48 hours check followed for twin engine jet? Check brakes. Check oil level. Check main and more landing gear. Do operational check of stand by power. Test engine, APU. Do operational check of interior emergency lights. Do operational check of fire / overheat systems. Do operational check of TCAS. ETOPS check.

95. How is transit check followed for twin engine jet? Service engine oil. Check RAM air inlet / exhaust door and cabin pressure outflow valve. Check positive pressure relife valves. Check all movable flight control surfaces. Check more and main landing gear and wheels. Check navigation and communication antennas. Check static ports and probs. Check crew oxygen discharge for pressure. Check for leakage of fuel and / or hydraulic fluid. Check primary control surfaces. Check using tips and lower using surfaces for fuel leakage. Check engine cowlings etc.

96. What is IFSD?IFSD is inflight shut down of an A/C engine when one of the engines shut down because of

some malfunction. The malfunction is probably one of the most serious in aviation, particularly ifthe airplane only has two engines or even one.

97. Differentiate between QA and QC?QA (Quality Assurance) – The M & E organization responsible for setting standards of

operation and for monitoring the operator units to ensure that such standards are met.

QC (Quality Control) – The M & E organization responsible for conducting inspection ofmaintenance work and for calibration of tools and test equipment.

98. Define “BITE”? What is “EBU”?BITE means Built-in Test Equipment – Special equipment associated with certain systems to

monitor health and operation of those systems and to aid in fault location efforts.EBU means Engine Build Up – The process of adding components to a basic engine to

configure it for installation on a specific A/C and position.

99. What do you mean by Engine Cycle?Operation of the A/C engine from start-up to shut down.

100. Differentiate between process - oriented and task - oriented maintenance.The process oriented approach to maintenance uses Hart time (HT), On condition (OC) and

Condition monitoring (CM) to accomplish scheduled maintenance actions.The task - oriented approach to maintenance uses predetermined maintenance tasks to avoid

in service failures. Redundancy of equipment and system helps as a back up to avoid in servicefailure. Task oriented is applicable in few countries. It’s a future concept of A/C maintenance.

LONG QUESTIONS

1. What are the factors affecting General Aviation?2. What is the role of IATA and ICAO in Aviation industry?3. Explain the level of management of M & E organization for Airlines with a neat chart.4. What is the Chicago convention, for freedom of the air in respect of scheduled international air

services?5. Explain the Airport management system.6. What is the procedure for evaluation of new A/C and old A/C added to the fleet?7. What are the factors that effect cost of passenger fare?8. Explain production planning and control (PP&C).9. Explain fleet planning.10. Explain different way of leaving procedure for Airlines.11. Differentiate between “Equipment maintenance procedure of Airlines and “Equipmentmaintenance procedure of M & E organization.12. How is hub and spoke scheduling advantageous over point to point scheduling?13. How is A/C scheduled in line with A/C maintenance practices?14. What is line maintenance? How is it different from maintenance done in hanger?15. What is the procedure for selecting a computer system for airline maintenance?16. Explain reliability. How do you go about “Investigation of reliability alerts”?17. What is MSC? Explain Hard Time, On Condition and Condition Monitoring Maintenance.18. Differentiate between EROPS and ETOPS. Why we need ETOPS?19. What is the procedure for Ageing A/C maintenance?20. How do you define the maintenance intervals?21. What do you mean by materials? How is it related to product support and spares?22. What is maintenance sharing? How is it done?23. Explain NDT. How is it related to A/C maintenance in future? Explain Task-oriented maintenance

as the future of A/C maintenance.24. How is A/C weight and budgeting control done? What do you mean by onboard maintenance

systems?25. Explain Engine monitoring, Turbine engine oil maintenance, Turbine engine vibration monitoring,

in A/C. What is life usage monitoring?