1.11 Flight Controls Flashcards
What are the primary flight controls for the PC-21?
- Ailerons
- Roll spoilers
- Elevator
- Rudder
What are the secondary flight controls of the PC-21?
- Flaps
- Airbrake
What controls have trimming systems?
- Elevator
- Aileron
- Rudder
What does the gust control lock do?
Prevents the ailerons, elevator and rudder from moving when the aircraft is parked on the ground.
How can hydraulic power to the aileron and roll spoiler actuators be isolated?
By selecting the TRIM AIL PWR switch to OFF
What cautions come on when the TRIM AIL PWR off switch comes on?
SERVO and SKID cautions
What does the artificial feel unit for lateral movement of the control column?
It is provided to Centre the column and gives increasing resistance to movement when the control column is deflected laterally.
Does each aileron have a balance tab? Are they functional at the moment on RAAF PC-21 aircraft?
Yes
No
Are the elevators supplemented by hydraulic power?
No, they are controlled just through a system of push pull rods, cranks and cables.
Are the two elevators connected? By what?
Yes by a torque tube
What happens if one elevator is damanged?
The torque tube will shear, disconnecting the damaged surface and enabling the undamaged elevator to operate normally.
What does the bob weight do?
Reduces the control force required to pull high g maneuvers
What do the balance trim tabs do on each elevator?
When the elevator trim tab moves, the balance trim tab moves in the opposite direction. This decreases aerodynamic moment about its hinges and reduces force required to deflect the elevator.
Does the rudder have hydraulic augmentation?
No it s a conventional manually-operated rudder.
If opposing trim selections are made simultaneously in the front and rear cockpits, what happens?
The associated trim actuator will stop until one or bother trimmers are released.
What can the pilot do if there is an uncontrolled runaway of a flight control?
The pilot can select the TRIM/AIL PWR switched to inhibit the trim functions.
What do the green indications mean on the TTI?
Take-off position for the trims.
What supplies power to the trim systems?
BATT BUS
What does the TAD do?
Provides automatic rudder trim to compensate for aircraft yawing conditions resulting from changes in engine torque and AOA
What does the TAD do on the ground?
It commands the rudder to a fixed TO position (7.5 deg nose right) in order to counteract the effects of prop slipstream and engine toque left yaw effects during TO roll.
Does the TAD eliminate the need of the pilot to manually control yaw on TO and in dynamic flight maneuvers?
No
How is the TAD powered?
GEN 1 BUS
How can the TAD be switched off?
- By pressing the TAD button OR
- Selecting TRIM AIL PWR switch to OFF
How are the secondary flight controls controlled and powered?
Electrically controlled and hydraulically powered.
How type of flaps are on the PC-21?
Single slotted Fowler Flaps
If the main hydraulic system fails, how can the pilot select the flaps to down?
By pulling the EMER LDG GR handle and then selecting the flap position
After pulling the EMER LDG GR handle, and the flaps have been selected to TO or LDG, can they be retracted?
No
If electrical power from the BATT, GEN 1 and GEN 2 busses fail fail, what will happen to the flaps?
They will automatically retract and the pilot will be unable to extend the flaps.
If the main hydraulic system fails, can the airbrake be extended or retracted?
No it can’t be extended or retracted.
What powers the airbrake?
GEN 2 BUS
What counteracts the nose up pitch moment caused by the extension of the airbrake?
A pitch compensation system which automatically commands the elevator trim to move to counteract the pitch up moment.
If a hollow white circle appears in flap position on MFD, what does that mean?
Flaps are in transition
What does a solid yellow circle in flap position mean on MFD?
Flap has malfunctioned.
