Systems - Flight Controls Flashcards
Flap lever indication and actual flap slat configurations for each stage? Both on ground and in flight?
Selector going from 0 to 1:
Below 100kt = 1+F
Above 100kt = 1 (no flap)
Selector going from 2 to 1:
Below 210kt = 1+F
Above 210kt = 1 (no flap)
Flaps 2 = slats 2, flaps 2
Flaps 3 = slats 2, flaps 3
Flaps full = slats 3, flaps 4
At higher speeds with Flaps 1 selected, flaps will automatically extend when slowing through 100kt.
At lower speeds with Flaps 1 selected, flaps will automatically retract when accelerating through 210kt.
In air (GA):
When position 1 is selected in flight from flaps 2 or greater, slats and flaps both retract to 1+F (if below 210kt)
What is A-LOCK/Speed lock/slat alhpa?
Prevention of the slats retracting, even if selected, in high angle of attack (above 8.5 °)/slow airspeed (below 148kt) situations. “A-LOCK” pulses while slat retraction is inhibited.
Once the slats alpha/speed lock function is active, the slats retract to 0 when:
‐ The AOA is less than 7.6 ° and
‐ The speed is above 154 kt
Which flight control computers are still powered in the emergency electrical configuration?
The ones on the CA’s side of the overhead panel.
What are the flight control modes and laws?
Ground mode/flight mode:
Normal law
Alternate law
Direct law
Others:
Abnormal law (for recovery from non-normal pitch bank scenarios caused by an external force)
Mechanical backup
What is mechanical backup control? (flight controls)
Backup control is provided to control the aircraft using the manual pitch trim wheels, the rudder pedals, and engine thrust in the case of a total electrical failure or if all 7 flight control computers fail (hyd pressure must still be available).
Normal law pitch protections:
-Maneouvre protection
-Pitch attitude protection
-High speed protection
-Alpha protection (aoa)
What is Alpha Floor?
An autothrust feature (if functioning), availbe from immediately after TO to 100ft RA on landing/approach in normal law only. Automatically activates between Alpha Prot and Alha Max (whenever the AoA is excessive or rapidly increasing) and will command the engines to TOGA thrust (can activate at any airspeed). Once AoA is recovered, TOGA thrust must be deactivated by the pilot.
What does forward and aft stick movement command?
A change in load factor
What does left and right stick movement command in normal law? What are other roll features?
A roll rate (15deg/sec for full stick).
Bank Angle Hold and Auto Pitch Trim
At or less than 33deg AoB, the aircraft will hold the selected AoB, and automatically apply elevator to hold a level turn.
Positive Sprial Stabilty
Above 33deg (but less than 67deg), if the sidestick is released the aircraft will correct the AoB to 33deg, then hold 33deg. If Alpha or High Speed protection becomes active, PSS will be available at any AoB, and will return the A/C to 0 AoB.
Pitch and bank limits in Normal Law
AoB is limited to 67deg, or 45deg if either Alpha Prot or High Speed Prot are active.
Pitch limited to 30deg nose up, 15deg nose down.
What does landing mode do? (flight controls)
Memorises the attitude at 50ft RA, then commands a gentle nose down input at 30ft RA requiring the pilot to counter and thus simulating the feeling of flaring.
When does alternate law become active?
Alternate law automatically becomes active when any systems affecting flight control performance experience multiple failures.
In alternate law, which protection always exists and which ones depend on the failures present?
Always availbale in alternate law:
Load Factor Limitation
Depend on the failure(s):
Pitch Attitude Limitation
High Speed Stability
Low Speed Stability
