Flight Controls

Question 1

What controlls the pitch?

Answer 1

• Two elevators
• a movable stabiliser with two trim moduales controlled hydraulically
• Autopilot trims at 1/2 the rate of manual trim
• left AP uses the left modual
• Right AP uses right modual
• Center AP uses the left modual and then the right if the left is inop
• if only one AP is conected then operating the manual trim switch will disconect the AP
• During autoland or GA with multipule AP’s engaged then the trim is disconected

Question 2

What controls the Roll?

Answer 2

• Four ailerons ( 2 each wing)
• Twelve spoilers (6 each wing)

Question 3

What controls the Yaw?

Answer 3

• 1 rudder
• 2 Yaw dampers

Question 4

Explain the spoilers?

Answer 4

• 12 in total
• 6 each wing
• use all three hydraulic systems and are symetrically paired
• used to supliment roll controll
• speedbrakes use all spoilers
• auto speed brakes need = Speed brakes armed

= Thrust levers idle

= hydraulic pressure to gear til actuators

= sensors detect airplane is on the ground

note: speed brakes auto stow when thrust is applied.

Question 5

Explain the flaps and slats?

Answer 5

• Normal = Hydraulically
• Alternate = electrically
• 3 power drive units operated by center hyd system
• 1 PDU operated TE flaps which are all mechanically linked
• 1 PDU operates the inboard slats which are mechanically linked
• 1 PDU operates operates the outboard slats.
• Flap 1 selection just moves the slats to the midrange position.
• Flap load releif works when flaps are 25 or 30 and the flap limit speed is exceeded. The flaps ‘blow back’ to flaps 20 and return to selected flap when speed is reduced.

Question 6

Explain the alternate flap and slat system?

Answer 6

• electric motor driven
• can individually select and manually operate the slats and flaps.
• procedually limited to flap 20 due to no flap load releif
• no flap assymitry protection
• takes a much longer time
• FCTM = do not move speed bug until flaps are in commanded position.
• around 3 min from “up” to “20”

Question 7

Explain 1,2,3,4 and 5?

Answer 7

1 =

Illuminated (amber) –
• a flap disagree exists
• a flap asymmetry exists
• the flap load relief system is not operating when required

2 =

Illuminated (amber) –

• a slat disagree exists
• a slat asymmetry exists

3 =

Indicates flap position.
UP – the slats and flaps are retracted.
Between UP and 1 – the slats are between the retracted and midrange position. 1 to 30 – the flaps are in the indicated position.

4 =

NORM – normal flap operation, alternate system not in use. UP – the slats and flaps are retracted.

1–
• the slats extend to the midrange position

• the flaps remain retracted

5 to 20 –
• the slat sremain in the mid range position
• the flaps extend to the commanded position

Alternate flaps switches must be in ALTN for the slats and flaps to move.

5 =

ALTN –
• arms the selected LE slator TE flap alternate drive unit
• shuts off hydraulic power to the selected LE slat or TE flap drive system.

Off (ALTN not visible) – alternate flaps and slats command inactive.