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Ground School Systems 2 > PC-21 Flight Control Systems (FCS) > Flashcards

PC-21 Flight Control Systems (FCS) Flashcards

1
Q

What axes are the flight control systems meant to control the attitude of the aircraft around?

A

Roll, pitch and yaw

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2
Q

What are the primary controls?

A

Aileron, rudder, elevator

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3
Q

What are the secondary controls?

A

Airbrake

Flaps

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4
Q

How is the PC-21 wing attached to the fuselage?

A

By its center section

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5
Q

What is the PC-21 wing dihedral, sweep back angle?

A 
Sweep = 12.3 deg
Dihedral = 4.5 deg
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6
Q

What is the high speed profile?

A

Aerodynamic profile of the wing that allows it to travel at high speeds

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7
Q

What is max roll rate with powered ailerons and roll spoilers?

A

200 deg/s

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8
Q

What material is the leading edge made of?

A

Glass fiber for bird strike protection

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9
Q

What does the stall strip do and where is it located?

A
  • Improve effectiveness of TE control surfaces at high AOA.

- Located on leading edge of A/C

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10
Q

How many turbulators are there and what is their purpose, where are they located?

A
  • 9 on each LE of wingwing
  • Prevent a high-speed stall in roll.
  • Leading edge of A/C
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11
Q

What are the wingtip spoilers manufactured from? What is their purpose?

A
  • Carbon fiber
  • To reduce the A/C’s drag by partial recovery of the tip vortex energy.
  • Improve A/C handling characteristics
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12
Q

What do the ailerons have that isn’t functional?

A

Anti-balance tabs

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13
Q

What material are the roll spoiler manufactured from?

A

Carbon fiber composite material

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14
Q

What are roll spoilers designed to do?

A

Increase the roll rate.

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15
Q

What flaps does the PC-21 have?

A
  • Single-slotted Fowler flap

- Flaps augment the wing surface and consequently the lift

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16
Q

What does the airbrake do?

A

Increase drag and reduces airspeed in flight.

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17
Q

What is the tailplane made from?

A

Aluminum

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18
Q

What is included on elevators to provide mass balancing?

A

Horn balance

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19
Q

What do balance and trim tabs do?

A

1) Reduce aerodynamic moment due to elevators

2) Trim A/C in the pitch axis

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20
Q

What does the vertical stabilizer have?

A
  • Rudder with horn

- Trim tab

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21
Q

What does the Auto Flight Control System (AFCS) do?

A

Controls the A/C in roll, pitch and yaw by means of servos and trim actuator

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22
Q

What does the AFCS consist of?

A
  1. Flight Guidance Computer
  2. Pitch and roll servos
  3. Rudder trim actuator
  4. RIOCs 3 and 4
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23
Q

What sub-systems does the AFCS consist of?

A

1) Autopilot and Flight Direction System (AFDS) which controls pitch and roll axes of the A/C by using autopilot servos
2) Trim-Aid Device (TAD) which provides automatic rudder trim to reduce pilot input requirements to control for left turning tendencies.
3) These systems operate independently.

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24
Q

What does the flight control system comprise of?

A
  1. Control column and rudder pedals
  2. Flap selection lever
  3. HOTAS switches on the control column and the PCL
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25
Q

Where is the rudder trim switch located?

A

Front side of the PCL in each cockpit

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26
Q

What is the pitch and roll trim switches located?

A

Control column in each cockpit.

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27
Q

Where is the airbrake selector switch located?

A
  • On the top of each PCL.
  • Pulling it back extends the airbrake
  • Pulling it forward retracts the airbrake
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28
Q

What does the TTI do? What are the green indications?

A
  • Set of gauges which show the setting for roll, pitch and yaw.
  • Green markers indicate the TO trim positions
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29
Q

What does the artificial feel unit do?

A

Gives pilot sensation of force feedback

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30
Q

What drives the aileron movement?

A

Hydraulic Servo actuator connected to drive rods.

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31
Q

How are the roll spoilers driven, and how are they powered?

A

Hydraulically driven

Each roll spoiler has its own hydraulic actuator, powered from the main hydraulic system.

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32
Q

When will roll spoilers start to move?

A
  • Aileron reaches 4 deg of deflection, spoilers will start to move.
  • When aileron reaches the 13 deg up position, spoilers are fully deflected
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33
Q

How are the elevators operated?

A

Via cables and drive rods

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34
Q

What is installed on the output lever of the forward control column to reduce the control force required to pull high g maneuvers?

A

Bob weight

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35
Q

How is the bobweight balanced?

A

By a balance spring that is attached to the forward cable turning lever.

36
Q

What does each elevator have at its inboard trailing edge?

A

Balance tabs

37
Q

How is the rudder controlled?

A

Via control cables and tie rods

38
Q

What system is used to control trim in roll pitch yaw

A

Electrical actuators?

39
Q

What do the elevator balance/trim tabs do when the primary control surface is moved in any direction?

A

Moves in the opposite direction

40
Q

What does the balance/trim tab help to decrease?

A

The hinge moment of the control surface, to decrease the force the pilot has to apply in pitch and yaw.

41
Q

What type of flap does the PC-21 have? Where are they? How are they operated?

A
  • Single slotted Fowler flap
  • Inboard trailing edge section of each wing
  • Connected mechanically and are operated by a single hydraulic actuator through flaps lever
42
Q

What are the 3 degree positions of the flaps?

A 
Up = 0 deg
TO = 18.5 deg
LDG = 34 deg
43
Q

Where is the airbrake switch located?

A

Situated on PCL.

44
Q

How is airbrake powered?

A

Hydraulically powered

45
Q

What is extended degree position of the airbrake?

A

65.5 deg

46
Q

What sensor senses the position of the airbrake?

A

Proximity sensor

47
Q

What does the TAD do?

A
  • Provides automatic rudder trim to reduce prop torque effects and to compensate for the side effects of the prop slipstream.
48
Q

What RIOCs provide TAD functions?

A

RIOC 3 and 4

49
Q

Does the TAD completely remove requirement for pilot to rudder trim?

A

No

50
Q

What two speeds is the TAD moved at?

A
  • @ airspeed < 250 kts, tab is moved at 3.83 deg/sec

- @ airspeeds > 250 kts, tab is moved at 1.15 deg/sec

51
Q

Which rate does manual trimming move the rudder trim tab?

A

Lower rate 1.15 deg/sec

52
Q

What does the TAD do to provide neutral trim for take-off?

A

Moves the rudder trims to a preset TO position when WOW

53
Q

What occurs when aircraft is airborne?

A

TAD is in air-mode

54
Q

What parameters does TAD consider?

A
  • Engine torque
  • Airspeed
  • AoA
  • Underwing stores if fitted
55
Q

What does TAD switch show when TAD is opeational?

A

Unlit switch

56
Q

What does tad show when switch has been deactivated?

A

Cyan OFF on TAD switch.

57
Q

What occurs when TAD has been switched off?

A

TAD is deactivated, manual trimming is still available.

58
Q

Where is the powered ailerons and the roll spoilers status showsn?

A

MFD HYD

59
Q

What indications are shown when airbrake is out/not fully stowed?

A

Amber AIRBRAKE indication appears on PFD and EMD

- OUT inidication is shown on MFD HYD

60
Q

Which displays show a flaps position indication when in TO or LDG?

A

All three displays

61
Q

Where are flaps indication continually shown?

A

MFD

62
Q

Where is rudder pedals adjustment lever is installed?

A

Centre console in each cockpit, in order to allow the pilot to adjust the rudder pedals.

63
Q

What does the gust lock do?

A

Prevents the primary flight controls from moving in gusty conditions.

64
Q

What indication is shown when flaps are in transition?

A

Flaps indicator on all MFD, PFD, EMD shows a hollow white circle.

65
Q

What are the airspeed and g limits with flaps not fully retracted?

A

180 KIAS

+4 to 0 g

66
Q

How long on PFD and EMD are flaps indication show after reaching the up position?

A

9 seconds

67
Q

Which displays show flaps position when not retracted?

A

PFD, EMD, MFD HYD

68
Q

How can the pilot extend retract the airbrake?

A

Airbrake switch on PCL

  • Aft lowers the airbrake
  • Forward retracts the airbrake
69
Q

What indication is shown as soon as airbrake leaves stowed position?

A

Amber AIRBRAKE on PFD, MFD, EMD

70
Q

What aerodynamic effect occurs when airbrake is extended? How is this compensated?

A

Pitch-up moment

Counteracted by automatic pitch trimming system

71
Q

What is degree of aileron trim available?

A

+4 to -4 deg

72
Q

What degree of elevator trim is available?

A

+- 7.5 deg

73
Q

What degree of yaw trim occurs?

A

19 deg right and 4 deg left.

74
Q

What occurs when opposing trim selections are made in front and rear cockpit?

A

Trimming will stop until trim actuator is released.

75
Q

How is the TAD activated? How is it selected off?

A
  • Automatically when aircraft is powered
  • Can be selected off by using the TRIM AID switch (Manual trimming still available)
  • TRIM/AIL PWR switch also can deactivate it (manual trimming will not be available.
76
Q

Are aerobatic maneuvers allowed with flaps extended?

A

No

77
Q

What is the maximum demonstrated crosswind component for landing in clean configuration?

A

24 kt

78
Q

When does amber FLAP caution occur?

A

If the flaps have not moved to the selected position within 16s when airbone or 20 s when on ground.

79
Q

What does TRIM AID caution mean?

A

TAD failure

80
Q

How can TAD be reset?

A

Turning off then on.

81
Q

What can pilot do when there is a trim runaway?

A

Turn TRIM/AIL PWR to off

82
Q

Are trim functions available when TRIM/AIL PWR switch has been turned off?

A

No

83
Q

What does amber OVERSPEED FLAP advisory mean?

A

Flaps are not in UP position and speed > 183 kias.

84
Q

What does a grey FLAP ALRT mean?

A

Flap alert function is not available.

85
Q

The left and right elevators operate together. However, when one elevator becomes damaged what component allows the undamaged elevator to operate normally?

A

Torque tube

86
Q

If the electrical power from the BATT BUS, GEN 1 and GEN 2 busses fail, what will occur to the flaps?

A

Retract automatically.

Ground School Systems 2 (19 decks)

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