How are the ailerons, elevators and rudder actuated?
They are controlled by a network of cables, pulleys, push/pull rods, and levers that transmit control inputs to the respective hydraulic power control unit (PCU)
Which control wheel is connected to the right aileron?
First officer’s
Which control wheel is connected to the left aileron?
Captain’s
Which control column is connected to the right elevator?
First officer’s
Which control column is connected to the left elevator?
Captain’s
What is the purpose of the multifunction spoilers (MFS)?
Assist with roll control (spoilerons) Act as spoilers in flight Assist with ground lift dumping after landing
Are the MFSs operational at any speed?
Yes
How are the MFSs controlled when used for roll assistance?
The first officer’s control wheel position sends an electrical signal to the left MFS panels which are hydraulically operated by PCUs. The captain’s control wheel position sends an electrical signal to the right MFS panels which are hydraulically operated by PCUs
What happens after the ROLL DISC handle is pulled?
The aileron and cable pulley systems are separated at the torque tube
What happens if a ROLL SEL switch light is not pressed after the ROLL DISC handle is pulled?
The pilot with the unjammed side will only have control of onside aileron, and cross side multifunction spoilers. NOTE: 20 seconds after the ROLL DISC handle is pulled, both amber ROLL SEL switch lights will illuminate and the SPOILERONS ROLL caution will appear on EICAS to prompt the pilots to select the side with the operable aileron.
What does pressing either ROLL SEL switch light accomplish?
The amber ROLL SEL switch lights will extinguish The green PLT ROLL or CPLT ROLL switch light will illuminate to indicate which side was selected. The PLT ROLL CMD or CPLT ROLL CMD advisory message will be displayed on EICAS. The selected pilot’s control wheel will control the left and right MFSs.
What protection is provided for an aileron PCU runaway?
When the pilot flying applies 9 lbs of force in the direction opposite the runaway, the bungee breakout system will separate the control wheels and the Spoiler Stabilizer Control Unit (SSCU) associated with the aileron that has not runaway will illuminate either the PLT ROLL or CPLT ROLL switch light, display the appropriate ROLL CMD advisory message, and automatically command both set of MFSs to respond to inputs from the control wheel connected to the operable aileron.
What is occurring when the pilots trim the aileron or rudder?
The control surfaces are 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 control gust locked?
Hydraulic fluid is trapped in the PCUs and flutter dampers during shutdown.
How is the Yaw Damper engaged?
YD1 and YD2 engage switchlights on the center pedestal
How is the Yaw Damper system disengaged?
By pressing the DISC button on the center pedestal
What controls the yaw dampers?
Flight Control Computer 1 (FCC1) control Yaw Damper 1 (YD1) Flight Control Computer 2 (FCC2) controls Yaw Damper 2 (YD2)
How are the flaps operated?
2 electric Power Drive Units (PDUs) mounted on a flap gear box
How many flap segments does the CRJ have?
4 (2 on each wing)
What degree of Slat/Flap deployment will the emergency flap switch command?
25 degrees slats/20 degrees flaps
Emergency flap switch inhibit speed
220 KIAS
What protection is provided to prevent flap asymmetry?
If the flap segments differ by more than 5 degrees, the flap brakes are applied and the flaps will remain at the current position. The Flap Electronic Control Unit (FECU) will prevent the flaps from being reset during flight
How is STAB TRIM operated?
A split switch on the control wheels operates two electric motors that turn a jack screw to change the horizontal stabilizer angle of incidence
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Boxed Memory Items98
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Speed Limitations17
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EMERGENCY EQUIPMENT18
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COMMUNICATIONS5
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AVIONICS AND FLIGHT INSTRUMENTS21
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AUTOMATIC FLIGHT CONTROLS SYSTEMS17
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AUXILIARY POWER UNIT13
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FUEL SYSTEM20
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AIR CONDITIONING/PRESSURIZATION18
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ICE AND RAIN PROTECTION10
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FIRE PROTECTION18
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ELECTRICAL25
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HYDRAULIC SYSTEMS15
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FLIGHT CONTROLS26
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LANDING GEAR, BRAKES, NOSE WHEEL STEERING15
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DIMENSIONS6
