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(M) Technical and Resource Knowledge > Flight Control System > Flashcards

Flight Control System Flashcards

1
Q

(B) What is the only primary flight control that is not Fly-By-Wire?

A

Ailerons (Ailerons are mechanically actuated)

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2
Q

(B) What is the difference between normal mode and direct mode?

A

Normal mode has FCM data which provides higher level functions, Direct mode has no protection.

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3
Q

(B) What are the higher level functions associated with pitch?

A
  • Gain on Airspeed
  • Elevator Thrust Compensation
  • AOA limiting
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4
Q

(T) Is there a back-up battery for the FBW system?

A

A dedicated lead acid battery charged by the DC ESS

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5
Q

(T) How much time can the FBW back-up battery provide

A

At least 15 minutes

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6
Q

(T) Can the FWB back-up batteries provide power back to the buses?

A

No. Internal Rectifier assures isolation in case of failure of the main electric power system and has its own heater to meet the minimum guaranteed temperature.

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7
Q

(T) How is Elevator Thrust Compensation Function (ETC) computed?

A
  • N1
  • Mach
  • Pressure Altitude
    Through the FADEC by TLA angle
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8
Q

(B) What are the higher level functions associated with yaw?

A
  • Yaw Damper
  • Turn Coordination
  • Gain on Airspeed (as airspeed increases, rudder deflection decreases
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9
Q

(B) What is the priority for the trim system?

A

1 - Back-up
2 - Captain
3 - First Officer
4 - Autopilot

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10
Q

(B) How is roll controlled?

A

Ailerons and multi-function spoilers

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11
Q

(B) How many multi-function spoilers are on each wing? What are their functions?

A
  • Total 5 on each wing
  • 3 MF Spoilers : Roll, Speed Brake, Ground Deployment
  • 2 Ground Spoilers: Dedicated for ground only
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12
Q

(I) When will the speed brakes automatically close even if the lever shows deployed?

A

This is a climb protection

  • Slat/Flap 2 or more
  • TLA greater than 70º
  • Below 180 Knots
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13
Q

(I) What is the flap/slat extension/retraction sequence?

A
  • Slats extend first and Flaps retract first
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14
Q

(B) Will lose of airspeed data cause the flight controls to go into “Direct Mode”?

A
  • Yes ( No data sent to the FCM to provide protection)
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15
Q

(B) Can a FCM override pilot input?

A
  • No, the pilot always has supreme control
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16
Q

(B) What happens to artificial feel if flight controls are disconnected?

A
  • Artificial feel is felt at 1/2 the normal load
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17
Q

(B) Will the multi-function spoilers function in DIRECT MODE?

A
  • Yes, for roll only and at a defaulted fixed gain
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18
Q

(B) What happens to the flight control system when the RAT is the only AC power source?

A
  • Horizontal stab trim operates at 1/2 speed
  • Slat/Flap system operates at 1/2 speed
  • Slat/Flap is limited to position 3 to allow adequate airspeed for the RAT
19
Q

(I) Which flight controls are electrically actuated?

A
  • Slat/Flaps (using Power Driver Units)

- Horizontal Stabilizer (2 DC motors)

20
Q

(T) What is the function of the standby PCU?

A
  • Incase of an active PCU failure

- Acts a damper to avoid flutter

21
Q

(T) What kind of flaps does this aircraft have?

A
  • Double-slotted Flaps
22
Q

(T) How many flap actuators?

A
  • 4 per side
23
Q

(T) How many Actuator Control Electronics

A
  • 9 ACE
24
Q

(I) How is the electrical P-BIT performed? and for how long?

A
  • Automatically during power up by any AC source

- 3 minutes

25
Q

(T) How is the electrical P-BIT test interrupted?

A
  • If any electric hydraulic pump is turned ON

- Another power source is introduced

26
Q

(I) How is the hydraulic P-BIT test performed?

A
  • Only on the ground, when all three hydraulic systems are pressurized above 10°C
27
Q

(I) How is the hydraulic P-BIT interrupted?

A
  • Movement of the yoke and rudder pedal
28
Q

(I) Can the hydraulic P-BIT perform with hydraulic reservoir temperature below 10ºC/50ºF?

A
  • No
29
Q

(T) How many FCM units?

A
  • 4 independent units
30
Q

(I) How do you slow the aircraft in flight and which panels operate, specifically?

A
  • The use of speed-brakes

- 3 (on each side) MF spoilers

31
Q

(T) What happens when you move the speed break levers?

A
  • Electronic signal sent to MAU
32
Q

(T) Higher level functions of Horizontal Stabilizer?

A
  • Keep airplane trimmed via the AP and deployment of speed breaks
  • Prevent structural damage at high speeds
33
Q

(I) When do the spoilers automatically retract during landing?

A
  • 5 seconds below 45 knots

- TLA beyond 35°s

34
Q

(T) How many degrees up when full speed breaks are deployed in flight?

A

30°

35
Q

(I) Spoilers in direct mode, what is not available?

A
  • Ground spoilers

- Speed brakes

36
Q

(T) How can you turn with the speed brake?

A

FCM computes roll and speed brake commands to provide a composite command

37
Q

(T) How many degrees does the MF and GRD spoilers deflect upon landing?

A

Multi-Function spoilers - 40°s

Ground spoilers - 60°s

38
Q

(B) How are the Slat/Flaps operated?

A

Electronically commanded and Electrically powered

39
Q

(T) What controls the Slat/Flap movement?

A

The Slat/Flap lever

SF-ACE 1 and 2 which command 2 power drive units (PDU)

40
Q

(T) What is PDU and what does that do?

A

Power Drive Units - gearbox and 2 electric motors

It moves the surface of the slat/flaps via transmitting drive lines

41
Q

(I) How do you know if the SLAT/FLAPS are in symmetry?

A

via Four PSU’s (Power Sensing Units)

42
Q

(T) How many actuators does each flap panel consist of?

A

2 Actuators/ 2 Flap panel per side = Total 4

43
Q

(T) What provides skew protection?

A

Electronic skew sensors send date to SF-ACE which will stop the movement

44
Q

(T) How many SLAT actuators are there for each panel?

A

2 actuators/4 Slat panel per side = Total 8

(M) Technical and Resource Knowledge (15 decks)

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