Flight Controls Flashcards
How are control surfaces actuated?
Hydraulically or electrically
Primary flight controls:
elevator
rudder
ailerons
Which controls are equipped with control disconnects?
elevator & ailerons
Which control has an anti-jam mechanism?
rudder
In the event of total electrical failure, which hydraulic pump is powered by the ADG?
3B
What unit moves the ailerons?
PCU’s
Are ailerons & MFS’s operated by the opposite yoke?
Yes
How many PCU’s per aileron?
2
SSCU’s
Spoiler Stabilizer Control Units
What are the flutter dampers for in flight?
Prevent aileron flutter when all hydraulic fluid is lost to the PCU
What are the flutter dampers for on the ground?
Gust lock function
Does pulling the ROLL DISC allow all ailerons & MFS’s to be available to one yoke control?
Yes
Selecting the ROLL SEL switch button on the glareshield allows the flying pilot to have control over the other:
spoileron
If the bungee breakout switch is actuated, what control is now available to the flying pilot?
Should the ROLL DISC handle still be pulled?
MFS’s
Yes
What provides rudder gust lock?
Trapped hydraulic fluid
How many yaw damper systems?
2
Is the yaw damper independent of the autopilot system?
Yes
FCC’s
Flight Control Computers
If both yaw dampers fail, does the autopilot disengage?
Yes
CA operates the ___ elevator:
FO operates the ___ elevator:
Left
Right
What happens if the PITCH DISC handle is pulled?
Reduced pitch control (1 elevator only)
Secondary Flight Controls:
slats flaps MFS's GLD devices aileron, rudder, horizontal stabilizer trim
How are the slats/flaps & trim actuated?
electrically
How are the flight/ground spoilers actuated?
hydraulically
Will changing aileron trim deflect the controls?
Yes
Will changing rudder trim deflect the controls?
No
Horizontal Stabilizer Trim AOI range?
+2 / -13 degrees
Where are the PITCH TRIM DISC switches located?
On each pilot’s control wheel
AFCS
Autopilot Flight Control System
SFECU
Slat/Flap Electronic Control Unit
How many slats?
How many flaps?
3 per wing
2 per wing
Which yoke connected to left aileron?
Right aileron?
Captain
FO
How are ailerons, elevators, & rudder actuated?
Yoke & pedals operate system of cables/pulleys that connect to push/pull rods at the flight control which operate a hydraulic PCU (power control unit) that hydraulically actuates control surfaces
What is purpose of MFS’s?
To assist with roll control & serve as a spoiler in flight/on landing
What is the flight deck indication of a jammed aileron cable?
Both yokes will be jammed
What happens after the ROLL DISC handle is pulled?
Aileron cable/pulley systems disconnected through torque tubes.
20 seconds later, if operable side has not been selected amber ROL SEL switchlight illuminates.
How is operable side selected?
Pushing the ROL SEL/PLT ROL switchlight on the unjammed side
What does pushing the ROL SEL/PLT ROL switchlight accomplish?
Allows pilot with operable aileron to control opposite side MFS’s
What is the flight deck indication of an aileron PCU runaway?
Aircraft begins uncommanded roll & PLT SEL switchlight on side w/o PCU runaway illuminates automatically because of the bungee break-out signal
What is occurring when pilots trim ailerons or rudder?
Control surface being repositioned. There are no trim tabs
What panels are part of the GND LIFT dumping system?
Inboard & outboard ground spoilers, all 4 MFS’s
How are flight controls gust locked?
Hydraulic fluid trapped during shutdown
How is Yaw Damper engaged?
YD1 & YD2 engage switchlights on the center pedestal
How is Yaw Damper disengaged?
DISC button on center pedestal
What controls yaw damper?
FCC
Is it necessary to disconnect yaw damper on landing?
No
How are flaps operated?
Electrically
How many flap segments does CRJ have?
4, 2 on each wing
Is there any asymmetrical protection within the flaps?
Yes, if flap segments differ by >5 degrees, brakes applied & flaps remain at current position
How is STAB TRIM operated?
Electrically.
Split switch on control yoke operates 2 motors & jackscrew changing horizontal stabilizer AOI
What systems can operate STAB TRIM?
CA trim switch
FO trim switch
Autopilot
MACK trim
What is priority of STAB TRIM control?
CA
FO
Autopilot
MACH trim
