Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

ATPL AASA > Aircraft Systems > Flashcards

Aircraft Systems Flashcards

1
Q

The type of alternating current used by a typical large aircraft electrical system is

A

115 VAC 400Hz

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

In the event of failure of the active sources of AC power generation in a large jet transport category aircraft, the component of the electrical system which supplies AC power is

A

The static inverter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Batteries are often connected in parallel in an aircraft electrical system to

A

Increase the total amp hour capacity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

The function of a transformer/rectifier unit (TRU) in an aircraft electrical system is

A

To convert AC to DC at a lower voltage

*Its TRU that AC/DC was a band and you don’t like their music so you need to LOWER their volume

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

The type of rectifiers normally used in large aircraft AC generators to provide DC for field excitation of the main generator are

A

Full wave bridge rectifiers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

When a generator field breaker (generator field relay) trips, the associated generator

A

Excitation field is disconnected from the voltage regulator

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

A constant speed drive on an AC generator in a large transport aircraft is required to maintain a constant generator RPM over a wide engine speed range. If the constant speed drive is disengaged during flight

A

The CSD may only be re-engaged on the ground

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

An advantage of constant frequency alternators in an aircraft electrical system is

A

Load sharing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

In a shunt wound generator, as load increases, output voltage

A

Decreases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

The KVAR meter in an aircraft electrical system measures

A

Reactive mode

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Real load in a large aircraft AC electrical system is expressed as

A

KW

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Total load in a large aircraft AC electrical system is expressed as

A

kVA

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

The circumstance which would prevent the connection of ground AC power to the electrical system of a large jet transport category aircraft is

A

A generator connected to its bus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Of the following, the consideration which is not an advantage of a NICAD battery over a lead acid battery would be
A. Reduced corrosion hazard
B. Better discharge chatacteristics
C. Lighter weight
D. Lower purchase price

A

Lower purchase price

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Correct bonding of the fuselage components in a large jet transport category aircraft is necessary to

A

Ensure an even electrical potential throughout the fuselage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

A bus bar in the electrical system of a large jet transport category aircraft is

A

A main point receiving electric current from generator or battery

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

In the event of a failure of the active sources of 115V AC power generation in a large jet transport category aircraft, the component of the electrical system which supplies DC power is

A

Battery

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Batteries may be connected in series in an aircraft electrical system to

A

Increase the total EMF

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

The function of a static inverter in an aircraft electrical system is

A

To convert DC to AC at a higher voltage

*Opposite of TRU

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

The component of an electrical system in which diodes would be found is a

A

Rectifier

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

When a generator breaker (generator control relay trips, the associated generator

A

Is disconnected from it’s bus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

A constant speed drive on an AC generator in a large transport aircraft is required to maintain a constant generator RPKKM over a wide engine speed range. If the constant speed drive is overheating

A

The CSD temperature must be monitored and the drive disconnected if necessary

*Then it can only be reengaged on the ground

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

An advantage of constant frequency alternators in an aircraft electrical system is

A

Paralleling

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

In a series wound generator, as load increases, output voltage

A

Increases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

The KW meter in an aircraft electrical system measures

A

Real load

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

An advantage of a lead acid battery over a NICAD is

A

Reduced risk of thermal runaway

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

Generator output in a large AC electrical system is expressed as

A

KVA

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

An APU generator will not connect to the electrical system during

A

Overvolt, undervolt, overspeed and underspeed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

Correct bonding of the fuselage components in a large jet transport category aircraft is necessary to

A

Ensure an even electrical potential throughout the fuselage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

A bus bar in the electrical system of a large jet transport category aircraft is

A

A main point receiving electric current from generator or battery

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

Batteries in a large aircraft are usually connected in parallel to

A

Increase the amps at constant voltage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

A generator breaker in the electrical system of a large transport category aircraft will trip when

A

The generator develops a fault

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

A trip free circuit breaker is one which

A

Will trip if an overload exists even if the reset button is held in

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

In an electrical system, diodes would be found in

A

A transformer rectifier unit (TRU)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

An advantage of AC over DC power for electrical systems in large jet transport category aircraft is

A

Weight and space savings

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

Hydraulic pumps in large aircraft hydraulic systems may be powered by

A

Engine, electrical system, bleed air or ram air turbine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

The term ‘hydraulic jack stalling’ means

A

Air pressure is preventing full extension of a particular jack

38
Q

Compared to hydraulic actuating systems, pneumatic systems of the same operating pressure

A

Exert less force

*Hydraulic exert more force than pneumatic
*Think of king air hydraulic wheels needing more force to come down than pneumatic blowing up ice boots

39
Q

In a hydraulic system with an operating pressure of 3000psi, an actuator measuring 10 inches by 10 inches would exert a force of

A

300,000 lbs

*10x10x3000

40
Q

A restrictor valve fitted to the landing gear hydraulic system of large jet aircraft is to

A

Prevent hydraulic cavitation during gear extension

41
Q

The purpose of the shuttle valve in the hydraulic system of a large jet transport category aircraft is

A

To allow hydraulic pressure form the alternate system to pressurise the lines in event of a failure of the normal system

42
Q

With a constant velocity type hydraulic pump, the system component which controls fluid flow to the using units is

A

The pressure regulator

43
Q

The component which is not common to both hydraulic and pneumatic systems is
A. Filter
B. Accumulator
C. Pressure regulator
D. Restrictor valve
E. Shuttle valve

A

Accumulator

*Accumulator is only in hydraulic system

44
Q

The component in the hydraulic system of a large jet transport aircraft which prevents fluid flow in the reverse direction to normal is

A

The check valve

45
Q

The component of a hydraulic system in a large jet transport category aircraft which acts as a surge suppressor is

A

Accumulator

46
Q

Bleed air from the engine compressors of a large jet transport category aircraft may be used for

A

Engine start, wing anti ice, engine anti ice, pressurisation, reverse thrust actuation

47
Q

In cruise at high thrust settings, bleed air for engine anti ice is normally supplied from

A

The LP bleed

48
Q

Anti ice systems on the wings of large jet transport category aircraft are usually

A

Pneumatic

49
Q

If a bleed duct leak is detected in the bleed air system

A

The leak should be isolated and the source shut off to prevent structural damage

50
Q

The statement which is not an advantage of a variable incidence tail plane with an elevator, compared to a conventional fixed tailplane with an elevator is
A. It allows the aircraft to be trimmed at any speed with full elevator travel available
B. It’s use reduces trim drag over a range of speeds and CG position
C. It allows a smaller and lighter elector than the conventional tailplane
D. It reduces control forces and is easier to overpower if out of trim

A

It reduces control forces and is easier to overpower if out of trim

51
Q

In an aircraft with a flying tail, as the pilot moves the control column

A

The tailplane moves and the elevator moves in the same direction

52
Q

In an aircraft with a hydraulically actuated system incorporating a hydraulic flap circuit or blow back valve (as an alternative to airspeed sensing) for overspeed protection, the mechanism which prevents the pilot from overspending the flaps when the aircraft is flying well in excess of the flap limit speed is:

A

The flaps can be selected but if an overspeed exists, the excessive air loads will cause hydralic pressure in the flap circuit to rise and be relived through the blow back valve, allowing the air loads to drive the flaps to a retracted position

53
Q

The aileron lockout system on the flight controls of a large jet transport aircraft operates

A

At high speeds to lock out the outboard ailerons

54
Q

Spoilers operate to assist roll control

A

Over all normal operating speeds except maximum cruise speed

55
Q

Safety switches in a jet transport undercarriage system are located

A

On the under carriage oleo strut

*They’d be no good on the handle because the wheels need to know where they actually are

56
Q

The condition when the use of differential braking (independent main wheel brake application) is permitted on a large transport aircraft to assist nose wheel steering and tighten the radius of a turn is

A

Only when the nose wheel becomes castoring past its normal angular travel

57
Q

The operation of the main landing gear doors on a large jet during landing gear retraction is controlled by

A

Sequencing valves

58
Q

Cam centering of the nose wheel steering system operates to straighten the nose wheel

A

Before landing gear retraction

59
Q

In an aircraft with multiple hydraulic systems, in the event of a hydraulic system pressure failure, alternate nose heel steering and anti skid brake protection is available for

A

All ground operations including landing and takeoff

60
Q

Thermal fuse plugs are found in some large aircraft

A

Wheels

61
Q

Antiskid braking system does not provide protection during

A

Lift off

*Provides protection during touchdown, hydroplaning, locked wheel and fail safe

62
Q

Prior to landing a large jet transport category aircraft, the auto brakes selector is set to level 3. Concerning pilot operation of the toe brakes during auto brakes operation in the landing roll

A

The auto brakes will disarm

63
Q

An aircraft landing gear tyre replacement is essential after

A

Thermal fuse plug melt

64
Q

The minimum speed for hydroplaning risk can be determined by

A

9x the square root of the tyre pressure in PSI for a rotating wheel and 7x the square root of the tyre pressure in PSI for a non-rotating wheel

65
Q

The purpose of chines on an aircraft tyre is to

A

Deflect water and slush

66
Q

The purpose of a marstrand aircraft tyre is to

A

Reduce the nose wheel shimmy

67
Q

The inputs required to enable operation of a typical jet transport category aircraft pressurisation system in automatic mode would be

A

Landing airfield elevation and cruise altitude

68
Q

The function of positive pressure relief valves in the pressurisation system of a large jet transport category aircraft is to

A

Limit the maximum positive pressure differential

69
Q

The function of negative pressure relief valves in the pressurisation system of a large jet transport category aircraft is to

A

Limit the cabin altitude to a value below or equal to the aircraft altitude

70
Q

The purpose of ram air doors (cooling doors) in the air conditioning system of a large jet transport category aircraft is to

A

Regulate the volume of air passing through the heat exchangers

71
Q

The function of the mixing valves in the air conditioning system of a large jet transport category aircraft is to

A

Regulate the mixing of cold and hot air for distribution into the passenger and crew cabins

72
Q

The air conditioning system of a large jet transport category aircraft has a water separator designed to

A

Remove water which condensed in the system during the cooling process

73
Q

2 main types of cooling systems used in the air conditioning system of a large jet transport category aircraft

A

Air cycle and vapour cycle

74
Q

The purpose of the cabin compressor in a light pressurised twin engined aircraft is to

A

Pressurise the cabin air

75
Q

Humidifiers are fitted to some aircraft air conditioning and pressurisation systems to

A

Increase the humidity of the air flowing to the passenger cabin by replacing the water removed during the cooling process

76
Q

If fitted to the air conditioning system of a large jet transport category aircraft, humidifiers are used

A

Always at high altitude

77
Q

The valve in the air conditioning and pressurisation system in a large jet transport category aircraft which controls the cabin pressure is

A

The outflow valve

78
Q

Cabin pressure differential is the difference between

A

Cabin pressure and ambient pressure

79
Q

The component which controls the operation of the outflow valve in the normal mode of operation in the air conditioning and pressurisation system of a jet transport category aircraft is

A

The pressure controller

80
Q

The most important parameter to monitor in the pressurisation system of a large jet transport category aircraft is

A

Cabin altitude

81
Q

The cabin altitude warning siren will be activated when the cabin altitude exceeds

A

10,000ft

82
Q

The component in the airconditioning and pressurisation system of a large jet transport aircraft which prevents the maximum cabin pressure differential from being exceeded is

A

The positive pressure relief valve

83
Q

The component of the air cycle machine in the airconditioning system of a large jet transport category aircraft, in which the coldest air is found is

A

The expansion turbine

84
Q

A pressurised aircraft is in cruise at FL330 with the cabin altitude at 8000ft. A climb is then made to FL350. regarding the operation of the pressurisation system in an isobaric mode

A

The differential pressure will increase to maintain a constant cabin altitude

85
Q

The ram valve in a pressurisation system is used to

A

Provide cooling and ventilation by ram supply into the cabin in unpressurised flight

86
Q

The amount of fresh air an aircraft air conditioning system should supply to each passenger for comfort is

A

One lb/min

87
Q

On an EICAS display with multiple pages of messages, pushing the cancel switch will

A

Pg 18 of 34 // 311

88
Q

The function of the Recall switch in the EICAS is to

A
89
Q

With reference to the cancellation of GPWS warnings and alerts when in the excessive terrain closure rate mode and not in the landing configuration

A

Q3

90
Q

The warning systems on the flight deck of a modern transport category aircraft generate a variety of sounds to alert the crew to specific problems The sound which indicates an engine fire warning is

A

4

91
Q

The GPWS will provide no indication for

A

5

92
Q

A GPWS has different modes of operation to protect an aircraft from premature or unintentional ground contact. The aural messages provided under various circumstances can often be a soft warning or hard warning, depending on the seriousness of the situation and the speed of the response required for corrective action. An example of a soft warning (caution or alert) and a hard warning

A

ATPL AASA (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions