FLIGHT CONTROLS Flashcards
WHAT DO THE PRIMARY FLIGHT CONTROLS CONSIST OF?
Primary Flight Controls consist of: ➢ Ailerons ➢ Spoilerons ➢ Rudder ➢ Elevator
WHAT PROVIDES LATERAL ROLL CONTROL?
Ailerons and Spoilerons provide lateral roll control. Two separate roll systems are provided.
HOW IS THE ROLL CONTROLLED AND HOW DOES THE SYSTEM WORK?
▪The Pilot’s control wheel operates the left aileron and right spoileron.
▪ The Co-Pilot’s control wheel operates the right aileron and left spoileron.
• Spoilerons only move up on the wing that is low in a commanded roll.
▪ Both systems are normally connected together via a torque tube and there is simultaneous and coordinated movement of all roll control surfaces from either pilot station
WHAT WOULD HAPPEN IF A JAM WERE TO OCCUR?
Should a jam occur in the roll system, the ROLL DISC can be pulled and isolate the right from left system.
• Once the systems are isolated, the pilot with roll control will select their ROLL SEL switchlight and the green PLT/CPLT ROLL Light will provide that side with the other spoileron for roll assist.
• If either switchlight is not selected within 20 seconds of pulling the ROLL DISC, the amber ROLL SEL will illuminate on both pilots switchlights.
WHAT IS ANOTHER POSSIBLE MALFUNCTION THAT COULD OCCUR WITH THE AILERON SYSTEM?
Another possible malfunction with the aileron system is a PCU runaway. When a single aileron actuator by extending or retracting towards the limit, an unwanted aileron deflection occurs.
• As the pilot inputs opposite control the tension is released by a regulator/break device (Bungee breakout). The aileron system will then provide dual spoileron control to the correct side and automatically illuminate the appropriate PLT/ CPLT ROLL Switchlight.
HOW IS YAW CONTROL PROVIDED?
Yaw control is provided through a single rudder by three independently powered hydraulic actuators.
IF THE RUDDER JAMS, WHAT CAN BE DONE?
In the case of a single jam, the remaining two actuators will be able to override it. Additional force will be required to move the rudder pedals.
HOW MANY YAW DAMPERS DOES THE CRJ 200 HAVE?
Two Yaw Dampers operate continuously during flight to alleviate Dutch Roll tendencies and improve directional stability and turn coordination.
HOW IS PITCH CONTROL PROVIDED?
Two independent elevators provide pitch control. Each elevator is powered by 3 independent hydraulic systems. The left and right elevators are controlled by each pilot respectively. Under normal operations both systems are interconnected by a torque tube like the ailerons.
WHAT WOULD HAPPEN IF YOU WERE TO HAVE A ELEVATOR JAM?
Should one side of the elevator jam, it can be isolated by pulling the PITCH DISC handle. This allows the operable side to control the remaining elevator.
WHAT PROVIDES PITCH TRIM AND HOW DOES IT FUNCTION?
Pitch Trim is provided by 2 independent motors that actuate a jackscrew and moves the whole horizontal stabilizer. The trim DOES NOT move the elevators.
▪ At least on pitch trim motor is required for autopilot engagement.
▪ There is also a MACH TRIM that becomes active above .40 Mach. Its purpose is to aid in increasing longitudinal stability when the auto pilot is not engaged.
DESCRIBE THE FLAP SYSTEM.
Flaps do what flaps should do… They are powered by 2 PDUs and a flex drive. Should a PDU fail they will then move at half speed.
WHAT ARE FLUTTER DAMPERS?
Flutter dampers are installed on the ailerons and elevators to prevent flutter in-flight. They also provide a gust lock function when on the ground.
HOW MANY FLIGHT SPOILERS DO WE HAVE AND WHERE ARE THEY LOCATED?
A single flight spoiler is located on the upper surface of each wing inboard of the spoileron. The third spoiler out.
HOW MANY GROUND SPOILERS DO WE HAVE AND WHERE ARE THEY LOCATED?
There are 4 total ground spoilers, 2 on the inboard upper area of each wing.
