Flight Controls Flashcards
The primary flight controls consist of:
Ailerons
Elevators
Rudder
Which flight control switch is a maintenance function only?
SPOILER switches
The ailerons are powered by which hydraulic system?
Both ailerons are powered by both system A and system B
Can the ailerons be actuated with the loss of hydraulic systems A and B? Explain.
Yes. They will require higher forces due to friction and aerodynamic loads.
This is known as manual reversion
Aileron trim indication is shown where?
On top of the yoke
Why is use of the aileron trim with the autopilot engaged prohibited?
The autopilot overpowers the trim, prevents the indication on the yoke, and can result in an out of trim condition and autopilot disconnection
How many flight spoilers are on each wing? How are they powered?
4 per wing
System A powers two on each wing while System B powers two on each wing
What is the purpose of the “spoiler mixer”
The spoiler mixer deploys spoiler panels proportional to aileron movement. They deploy when the control wheel is displaced more than approximately 10 deg. They deploy on the aileron up side of the aircraft and remain stowed on the aileron down side.
Can any spoilers be used with a loss of hydraulic system A and B?
No. There is no manual reversion on the ground or in flight.
What is the purpose of the “aileron transfer mechanism”?
To isolate the aileron system from the flight spoilers if a jam occurs.
The ailerons are connected to whose control wheel, such that if a jam occurs in the spoilers, this pilot could continue to fly utilizing the aileron controls?
The captain
The spoiler system is connected to whose control wheel, such that if a jam occurs in the ailerons, this pilot could continue to fly utilizing the flight spoilers?
The First Officer
Which hydraulic systems power the elevators?
Both system A and B
With a loss of all hydraulic systems, how can the aircraft be controlled with the elevator?
The elevators can be mechanically controlled by the pilots control columns. This is known as manual reversion
What does the “Elevator Feel Computer” do?
The computer provides simulated aerodynamic forces to the control column by using data from the elevator pitot system and stabilizer position.
The elevator feel computer uses which hydraulic system for power?
System A or B, whichever pressure is higher
What does the FEEL DIFF PRESS light indicate?
Either hydraulic system or elevator feel pitot system has failed, or excessive differential pressure is sensed in the elevator feel computer
The stabilizer trim is powered by what?
A single electric trim motor
How can the stabilizer trim be adjusted?
The stabilizer trim switch on either control wheel
Autopilot trim
Manually, by rotating the stabilizer trim wheels
What is the procedure to combat a control column jam?
Apply force against the jam in the control columns. After the breakout the control column that moves freely will provide adequate elevator control for the remainder of the flight
What is the purpose of the stabilizer trim cutout switch?
The switch deactivates stabilizer trim anytime the direction of trim is opposite of pressure on the control column
The rudder is powered by which hydraulic system(s)?
Systems A and B
How many PCU (power control units) power the rudder? What are the names?
2
The main PCU (powered by hydraulic systems A and B)
The standby PCU (powered by the standby system)
Above _____ kts the hydraulic system A and B pressure is reduced by approximately 25% inside the main PCU. What is the purpose of this?
135 kts
This limits full rudder authority in flight, while preserving full authority during takeoff and landing
What happens to the rudder if either system A or B is jammed or disconnected?
The FFM (force fight monitor) automatically turns on the standby hydraulic pump and opens the standby rudder shutoff valve to pressurize the standby rudder PCU
What flight deck indications display to show the standby rudder is in use?
How can this be manually activated?
Master Caution illuminates with FLT CONT indicating
STBY RUD ON light on the flight control manel illuminates
Activated manually by either A or B switches placed to STBY RUD on the FLT CONTROL panel
How will the Rudder Trim Indicator display that it is inoperative? Can the rudder trim still be used?
There will be an OFF flag in the left side of the rudder trim window. With the rudder trim indicator inoperative, the rudder trim can still be used.
The yaw damper system consists of ___ yaw dampers
2
Main and standby
The yaw damper is capable of providing:
Roll prevention
Gust damping
Turn coordination
Which yaw damper inputs are shown on the yaw damper indicator?
Only main yaw damper inputs
During normal operations, the main yaw damper uses hydraulic system ___.
B