Flight Controls Flashcards
How is manual control input information sent to the control surface in the normal mode
Pilot control input - ACE’s - PFC - ACEs - control surface
How is Autopilot control input information sent to the control surface
a/p - PFC - ACEs - Control surface
How many spoilers
14
When do flaperons operate
In proportion to the flaps
When to the ailerons begin to move down for increased lift (droop)
Flaps 5, 15 and 20
What are locked out at high speed on the wing to prevent high loads
Ailerons, spoilers 5 and 10
When is the rudder aerodynamically effective
60kts
What are the modes of operation of primary flight controls
Normal, Secondary and Direct
What modes can be manually selected
Normal and Direct
What is envelope protection is available in Normal mode
- Stall Protection
- Overspeed protection
- Bank angle protection
What functions are lost in secondary mode
- Autopilot
- Auto speedbrakes
- Envelope protection
- Gust suppression
- Tail strike protection
- Thrust assymetry compensation
- Yaw dampening
How are control inputs sent to the control surface when in the secondary mode
Same as normal mode, PFC use simplified commands
What is lost in the direct mode
- All secondary mode losses
- Manual rudder trim cancel switch
What changes when when in the direct mode as far control input signals
PFCs no longer used
How is the aircraft controlled if complete electrical failure occurs
Cable operated spoilers and stabiliser
Up to what angle of bank will PFCs automatically maintain altitude
30 degrees
In flight pitch trim is achieved by changing the _________ reference speed
Trim
The alternate stab trim levers are linked to the stab control modules by ________
Cables
How does stall protection work
- Trim reference speed inhibited in the nose up direction at approx. min maneuvering speed
- Constant collum pressure at higher than normal force
How does overspeed protection work
At Vmo Mmo-
- Trim reference speed inhibited in the nose down direction
- Constant collum pressure at higher than normal force
In normal mode automatic pitch trim is provided for what configuration changes
- Thrust changes
- Gear config changes
- turbulence
- flap and speed brake changes
- turns up to 30 degrees AoB
In secondary and direct mode, how is the stabilizer trimmeed
Directly
In normal mode how is the stabilizer trimmed
Using the trim reference speed
What hydraulic system is the stabilizer control
Center and right systems
In normal mode with stab trim cutout switches in cutout can pitch trim on the control column be used
yes, trims the elevator using the PFCs
What is the purpose of the stab position indicator
- Indicates the stab position, green band for take off
- position verified by the nose wheel oleo
Is airleron trim available with autopilot on
No
Which spoilers are mechanically operated
4 and 11
How does bank angle protection work
- If 35 AoB exceeded control wheel force attempts to return the aircraft below 30 AoB
- A/P disengage bar disables protection
- Can be over ridden by the pilot
What happens automatically to rudder deflection as airspeed increases
Reduces to prevent over stressing
When will the TAC activate
- More than 10% thrust difference between engines
On the ground will the TAC compensate for the full yaw of an engine loss
No, to allow pilot recognition of an engine failure
In flight will the TAC compensate for the full yaw of an engine loss
Yes
When is TAC not available
- Less than 70kts on the ground
- Reverse thrust is applied
- Automatically disengaged due system fail or loss of engine data
What does the wheel to rudder crosstie do
- Control wheel inputs can deflect the rudder 8 degrees - In flight below 210kts
What do yaw dampers do
- Provide coordination
- Prevent dutch roll
Will gust suppression result in rudder pedal movement
No
In secondary and direct mode which spoilers are not available
4, 5, 10, 11
When will spoilers deploy
- In ARMED position when main gear wheels on ground and not tilted, with thrust levers idle.
- Automatically when reverse thrust IDLE regardless of lever postion
When will spoilers retract
- At selection to DOWN
- Automatically if either thrust lever is advanced to take off position
Automatic speed brakes are available in which modes
Normal only
When is flap and slat operation inhibited in flight
- over 275kts
- above 20,000ft
What are the secondary flight control modes of operation
Primary, Secondary and Alternate
When is flap load relief activated
- Flaps 15 or higher
- 1 knot above placard speed
- Until 5kts below the placard speed
What load relief is available in secondary mode
Slats only will retract to the mid position if airspeed reach 256kts
When will the auto slat system activate
- Signal from the stall warning system will extend slats to the full position
- Retracts a few seconds after signal is removed
