Flight Controls Flashcards
Which yoke is connected to the right aileron?
First Officer’s
Which yoke is connected to the left aileron?
Captain’s
How are the ailerons, elevators, and rudder actuated?
Yoke and pedals operate a system of cables and pulleys that connect to pull and push rods at the flight control which operate a hydraulic PCU (Power Control Unit) which hydraulically actuates the control surface.
Which yoke controls the right elevator?
First Officer’s
Which yoke controls the left elevator?
Captain’s
What is the purpose of the Multifunction Spoilers (MFS)?
To assist with roll control and serve as a spoiler in flight and on landing
Are the Multifunction Spoilers operational at any speed?
Yes
How are the MFSs controlled when used for roll assistance?
The FO’s yoke position sends an electrical signal to the left MFS panels which are hydraulically operated by PCU’s. The CA’s yoke position sends an electrical signal to the right MFS panel which are hydraulically operated by PCUs.
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?
The aileron cable and pulley systems are disconnected through torque tubes. 20 seconds later, if the operable side has not been selected, the amber ROL SEL switch/light illuminates.
How is the operable side selected in an aileron jam?
Pushing the ROL SEL/ PLT ROL switch/light on the unjammed side
What does pushing the ROL SEL/ PLT ROL switch/light accomplish?
Allows the pilot to control the operable aileron to control the on-side MFS panels.
What is the flight deck indication of an aileron PCU runaway?
Aircraft begins an uncommanded roll and the PLT SEL switch/light on the side without the PCU runaway illuminates automatically because of the bungee break-out signal.
What is occurring when the pilots trim the ailerons or rudder?
The control surface is being repositioned there are no trim tabs.
What panels are part of the GND LIFT dumping system?
Inboard and outboard ground spoilers, all 4 MFS panels
How are the flight controls gust locked?
Hydraulic fluid is trapped during shutdown
How is the Yaw Damper engaged?
YD1 and YD2 engage switch/light on the center pedestal
How is the Yaw Damper disengaged
DISC button on the center pedestal
What controls the yaw damper?
The flight control computer (FCC)
Is it necessary to disconnect the Yaw Damper on landing?
No
How are the flaps operated?
Electrically
How many flap segments does the CRJ have?
4 total, 2 on each wing
Is there any asymmetrical protection within the flaps?
Yes, if the flap segments differ by more than 5 degrees, the brakes are applied and the flaps will remain in their current position
How is STAB TRIM operated?
Electrically. A split switch on the control yoke operates two motors and a jack screw changing the horizontal stabilizer angle of incidence
What systems can operate the STAB TRIM?
CA’s trim switches
FO’s trim switches
autopilot and MACH trim
What is the priority for STAB TRIM control?
CA
FO
Autopilot
MACH trim
What aids the crew in directional control during a jammed rudder condition?
Rudder system anti-jam/breakout mechanisms
The purpose of aileron flutter dampers is:
To prevent control surface flutter when hydraulic power is lost to the PCU’s
What are the takeoff flap settings?
8° and 20°
The elevators, rudder, and ailerons are
manually controlled and hydraulically actuated
What is the purpose of the Aileron Bungee Breakout Switch?
Provides automatic on-side MFS control to operable circuit during aileron PCU runaway
Who/what has the highest priority when trimming the horizontal stabilizer trim?
Captain
The horizontal stabilizer trim limits are
+2° to -13°
A SPOILERONS ROLL caution message, accompanied by amber ROLL SEL lights on the glare shield indicates
Roll disconnect handle has been pulled, but spoileron priority has not been established
What are the selectable flap positions?
0-1-8-20-30-45
What message appears on EICAS if one flap motor fails?
Flaps HALFSPEED
During landing or rejected takeoff, how does MFS deploy logic differ from the ground spoilers deploy logic?
MFS deployment requires R and L main landing gear WOW
In the event of total AC electrical power failure, the flight controls will remain operational because ACMP 3B is powered by the ADG Bus
True
Each elevator is hydraulically powered by ___PCU’s
3
A clacker will activate when the horizontal stabilizer is in motion for
3 seconds
