Flight Controls Flashcards
Does the failure of a single hydraulic system affect primary flight controls
a single hydrau lic system failure does not affect operation
With autopilot engaged how are flight controls operated
With the autopilot engaged, the flight controls are hydraulically operated by signals from the Automatic Flight Control System (AFCS). Stabilizer trim, yaw damping and turn coordi-nation are provided by the Flight Augmenta- tion System (FAS
If total hydraulic failure occurs what flight controls will still operate
If hydraulic pressure is not available, the aile-rons, rudder, and elevator can be operated by direct mechanical control and the stabi- lizer can be operated via an alternate electri- cal mode.
When will aileron servo tab unlock and what is their function
A servo tab at each aileron is locked during normal operation. If one aileron actua tor becomes depressurized, the servo tab will unlock to assist in manual operation of the affected aileron. If hydraulic pressure is not available, both servo tabs are unlocked and are operated by the control wheel move-ment. The ailerons are then operated by the servo tabs. An aileron trim wheel is located at the pedestal.
Does aileron trim require hydraulic pressure
No
What is the normal source of pressure for the rudder? If it fails
The rudder is normally operated by hydraulic system 2. If system 2 hydraulic pressure is not available the rudder will be operated by hydraulic system 1
What happens to the rudder when you pass 200 kts
Rudder authority at high speed is reduced by a rudder limiter, and pressure is 1100 psi
What can you do if a rudder limiter failure occurs
In the event of a rudder limiter failure, the system will default to the low speed mode if the landing gear is down and to the high speed mode if the landing gear is up. When the rudder limiter p/b is depressed to MAN, the low or high speed mode can be manually selected via the speed p/b.
What is the normal source of hydraulic pressure pressure for the elevators
The elevators, which are mechanically inter- connected, are normally powered by a dual hydraulic actuator. The left actuator is pow- ered by system 1, the right actuator by sys- tem 2. Either system is capable of operating the elevator
What would be the obvious difference if elevator hydraulics totally fail
Elevator would be 5 times heavier
How is the stab trim normally controlled
Stabilizer position is normally controlled by the Flight Augmentation System (FAS
When is the stab trim wheel eased for trimming
If the FAS fails, the stabilizer trim wheel at the pedestal can be used to position the stabilizer
When can you use alternate electric trim
If hydraulic pressure is not available, the stabilizer can be operated by an electric motor. The motor is controlled by the alternate stabilizer trim switch located at the pedestal.
What does the flight control lock effect
The ailerons can be locked in the neutral position and the elevator in the control col- umn forward position by a mechanical sys- tem operated from a lever at the rear of the pedestal.
What flaps position may be selected
Flap travel is from 0 degrees to 42 degrees
If hydraulic pressure to the flaps fails how can the flaps be operated
The flaps are normally operated by hydraulic pressure; alternately, the flaps can be operated by an electric motor
What happens when flap asymmetry occurs? Can it be reset
As soon as an asymmetry between the LH and RH flap positions is detected, hydraulic operation will be de- activated and an alert will be presented. Normal hydraulic flap operation cannot be re- established in flight. During alternate operation asymmetry protection is not provided, i.e. when an asymmetry is detected, the alert is presented, but alternate operation is not de- activated.
What is flap disagreement? What can be done about it.
Disagreement between the position of the flap selector and the flaps after flap travel will be detected, and an alert presented
Will a flap disagreement alert be presented in whilst in alternate operation
During alternate flap control, the disagreement alert will be inhibited.
Is there any speed restrictions on the use of speed brake? How does airspeed affect brake deployment
No
When does automatic speed brake retraction occur
Automatic retraction occurs when: - The TOGA triggers are activated, - A thrust lever is advanced beyond MIN TO with landing gear up, - Maximum forward thrust position is selected (wind shear recovery). - The landing gear is selected up with both thrust levers set above MIN TO (manual go-around), In the event of an electrical failure, an extended speed brake will retract automatically but very slowly. In the event of a hydraulic failure the speed brake will remain in the selected position. If the speed brake was extended, IN selection will cause the speed brake to retract by the aerodynamic airload, but at a slower than normal rate
What indication is there of speed brake operation
Speed brake extension is indicated by two speed brake lights at the main instrument panels
When do you arm the lift dumpers? What is the armed indication
Before take off
Before landing
When will lift dumpers automatically extend? Is there back up for this
If Rto
When will lift dumpers disarm ? How do you know they didn’t
At lift off, it will show up on the MFDU
When can you arm the lift dumpers on approach
After selecting landing gear down
If you get LIFTD UNSAFE alert, what can you do
It means system is unsafe , turn it off, level 3 alert, check landing distance
What does the stall prevention system consist off
2 Angle of attack vanes 2 stall protection computers 2 stall protection enhancement units 2 stick shakers A stick pusher
What activates the stick pusher
Both stall protection computers must detect a stall condition to activate the stick pusher
How is the stick pusher disconnected ? Can it be reset inflight
By operating the disconnect handle located at the pedestal, Cannot be reset inflight
How do you check if the T/O config is correct
The take-off configuration may be tested prior to take-off with the parking brake set by depressing the TAKE OFF CONF test button at the pedestal. If the take-off configuration is satisfactory not alerts will be presented and a T-O CONFIG NORM memo message is displayed.
What are the take- off warning alerts
Flaps not in TO position or in the alternate mode - Stabilizer not in TO range - Parking brake set - Speed brake not in - Life dumper unlocked - Flight Control lock on - One elevator hydraulic system depressurized
Can the take-off warning be cancelled
The take-off configuration alerts cannot be cancelled by depressing the MWL
