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Airbus 320 > Flight Controls > Flashcards

Flight Controls Flashcards

1
Q

Which spoiler surfaces are used for roll control?

A

2,3,4,5

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2
Q

Which spoiler surfaces are used as ground spoilers?

A

All spoilers. 1,2,3,4,5

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3
Q

Which spoiler surfaces are used as speed brakes?

A

2,3,4

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4
Q

How many flight control computers are there?

A
  1. 2 ELAC
    3 SEC
    2 FAC
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5
Q

How many computers are required to control the aircraft in roll and pitch?

A

1 ELAC or SEC

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6
Q

Which hydraulic systems power the elevators?

A

All three systems

Left elevator: Green and blue
Right elevator: Yellow and blue

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7
Q

What is the normal operating mode for the servojack NOT in active mode on the elevator?

A

Damping mode

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8
Q

What happens to the elevator servojacks if neither is controlled hydraulically?

A

Both revert to centering mode

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9
Q

How is the THS driven?

A

Driven by 2 hydraulic motors powered by green and yellow systems.

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10
Q

When is manual control of the THS available?

A

Whenever green or yellow system pressure is available

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11
Q

Which hydraulic system powers the ailerons?

A

Green and blue

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12
Q

How much is the aileron droop?

A

5° with flaps extended

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13
Q

Which hydraulic system powers the spoilers?

A

All three systems

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14
Q

What happens to the associated spoiler panel in case of SEC failure?

A

Panel is retracted and held down

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15
Q

What happens to the associated spoiler panel in case of hydraulic failure?

A

Panel blown down aerodynamically

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16
Q

Where is yaw damping and turn coordination calculated?

A

ELAC 1

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17
Q

How is the rudder deflection limited?

A

Function of speed

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18
Q

What happens in case of failure of rudder travel limiting system?

A

Deflection limit stops at last value.

Full authority restored on slat extension

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19
Q

Can the rudder be trimmed with the autopilot engaged?

A

No

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20
Q

When are the speed brakes inhibited?

A
  • Configuration Full
  • Thrust lever above MCT
  • Alpha floor active
  • AOA protection active
  • SEC 1 and 3 faults
  • Elevator fault
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21
Q

How is speed brake extension affected with the autopilot engaged?

A

Max deflection reduced, reached at 1/2 speed brake lever travel.

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22
Q

When will ground spoilers deploy on RTO?

A 
If armed:
- Thrust levers at idle
- >72 kts 
Not armed:
- >72 kts
- Reverse selected
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23
Q

How is the THS controlled electrically?

A

Driven by one of three electrical motors which control the two hydraulic motors

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24
Q

When do the ground spoilers deploy on landing?

A 
If armed:
- Touchdown of both main gear
- Thrust levers at idle
Not armed:
- Touchdown of both main gear
- Reverse selected
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25
Q

What are the 3 normal law pitch modes?

A

Ground
Flight
Flare

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26
Q

What protections are provided by the flight control system in normal law?

A
  • Load factor protection
  • Pitch attitude protection
  • AOA protection
  • High speed protection
  • Low energy warning
  • Bank angle protection
  • Pitch compensation
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27
Q

How are the flight controls positioned in ground mode?

A

Direct stick-to-surface relationship

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28
Q

How is tail strike protection provided?

A

Max elevator deflection reduced from 30° to 20° above 75 kts on takeoff

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29
Q

When is the transition from ground to flight mode?

A

Gradually over a 5 second period on takeoff (>8° NU)

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30
Q

What happens to the THS in ground mode?

A

Automatically set to 0°

31
Q

How does normal law in pitch function in flight?

A

Load factor-demand mode.

Elevator and THS set to maintain load factor proportional to stick deflection.

32
Q

When does the auto trim reposition the THS?

A

For a sustained elevator deflection

33
Q

For how much bank angle is pitch compensation provided?

A

33°

34
Q

When is flare mode entered?

A

Descending through 50’

35
Q

What happens in flare mode?

A
  • Modified pitch normal law
  • Direct stick-to-elevator relationship
  • Memorizes pitch at 50’, starts reducing to -2° at 30’
  • Autotrim not available
36
Q

What is the load factor protection flaps up?

A

+2.5 G -1.0 G

37
Q

What is the load factor protection flaps down?

A

+2.0 G -0 G

38
Q

What is the pitch attitude protection config 0-3?

A

30° NU (reducing to 25°)

15° ND

39
Q

What is the pitch attitude protection config full?

A

25° NU (reducing to 20°)

15° ND

40
Q

How does AOA protection function?

A
  • At Alphaprot, control law reverts AOA-demand
  • Full stick back, speed can reduce to Alpha Max
  • Releasing stick will return speed to Alphaprot
41
Q

Which protection has priority over all others?

A

AOA protection

42
Q

How is the bank angle limit changed when high speed protection is active?

A

Reduced from 67° to 40°

43
Q

Where is positive spiral stability introduced with high speed protection active?

A

0° bank angle

44
Q

How is a high-speed upset controlled by high speed protection?

A

As speed increases, nose down authority is reduced and a nose up command i commanded.

45
Q

Is it possible to overshoot VMO/MMO with high speed protection active?

A

Yes

46
Q

What is maximum roll rate commanded with sidestick at full stop?

A

15°/sec

47
Q

What is the limit for positive spiral stability within the normal flight envelope?

A

33°

48
Q

What is the bank angle limit?

A

67°

49
Q

Up to which bank angle will turn coordination be provided?

A

67°

50
Q

Will the autopilot remain engaged with high speed protection active?

A

No

51
Q

What happens when pressing the rudder in normal law?

A

Flight control system attempts to zero the roll. Sideslip established

52
Q

What is the aircraft response to an engine failure?

A

Attempts to zero the roll rate, commands some rudder to minimise the sideslip

53
Q

When is the sideslip indication (yellow) changed to sideslip target (blue)?

A

Engine failure on takeoff or go-around

54
Q

Is there any difference in the alternate law ground mode?

A

No

55
Q

Is there any difference in the alternate law flight mode?

A

Similar load factor demand law but with reduced protection

56
Q

Is there alternate law for roll and yaw?

A

Alternate for yaw, only direct for roll

57
Q

What protection is provided in alternate mode with reduced protections?

A
  • Artificial low speed stability
  • Stall warnings
  • High speed stability
58
Q

Is automatic pitch trim available in alternate law and direct law?

A

Only in alternate law

59
Q

What happens when abnormal attitude law engages?

A
  • Pitch alternate law with no protection except load factor
  • Roll direct law
  • Yaw mechanical law
60
Q

Can the aircraft be controlled in the event of total electrical loss or loss of all ELACs and SECs?

A

Yes. Using THS for pitch and mechanical rudder for lateral control.

61
Q

How many SFCCs?

A

Two

62
Q

How are the flap/slat PCUs controlled?

A

Each SFCC controls one motor of flap PCU and one motor of slat PCU.

63
Q

How are the PCUs powered?

A

Two hydraulic motors with diff gearbox.
Slats PCU - Green and blue
Flaps PCU - Green and yellow

64
Q

What are pressure off brakes?

A

Hold the flaps/slats in selected position

65
Q

What activates the wingtip brakes?

A
  • Asymmetry
  • Mechanical overspeed
  • Symmetrical runaway
  • Uncommanded motion
66
Q

Can the slats still be moved with the flap WTB on?

A

Yes

67
Q

How will failure of one hydraulic system or one SFCC affect the flaps/slats?

A

Will operate at half speed

68
Q

At which speed will the flaps retract in config 1+F?

A

210kts

69
Q

How many slats on each wing?

A

5

70
Q

Is yaw damping provided in Yaw Alternate law?

A

Yes, with limited damper authority (+/-5°)

71
Q

How many electric motors control the hydraulic motor of the stabiliser?

A

3

72
Q

How is roll control provided if both ELACs fail?

A

Through the spoilers. Ailerons revert to damping mode.

73
Q

How is the bank angle limit changed when AOA protection is active?

A

Bank angle limit is set to 45°

Airbus 320 (15 decks)

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