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AILERON AND FLAPERON CONTROL -ANALOG AND DISCRETE INTERFACES
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777 AIRCRAFT MAINTENANCE MANUAL
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27-11-00
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AILERON AND FLAPERON CONTROL -FORWARD CONTROLS
General
The forward controls of the aileron and flaperon control system include:
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Control wheels
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Wheel drums and shaft assemblies
*
Wheel jam breakout mechanism
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Wheel position and force transducers
*
Wheel backdrive actuators
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Wheel damper
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Feel and centering mechanism
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Travel stops.
The forward controls are below the flight deck.
Control Wheels
Each pilot has a control wheel. The control wheels turn to supply manual input to the aileron and flaperon control.
Wheel Cable Drums and Shaft Assemblies
A pair of control cables connects each control wheel to a cable drum. The left and right cable drums bearing mount on their drive shaft assembly. The cable drums indirectly move the shaft assemblies through the force limiters and the force transducer. There is a lost motion device on each wheel cable drum.
Wheel Jam Breakout Mechanism
The wheel jam breakout mechanism has two identical force limiters and two lost motion devices. If the control wheel jams, the force limiters allow the other control wheel to continue roll control. The upper force limiter connects the two wheel cable drums. The lower force limiter connects the right and left shaft assemblies. The lost motion devices allow the control wheel cable drums to move the left or right shaft assembly in case of failure.
Wheel Position and Force Transducers
Six wheel position transducers, on the airframe structure, connect to cranks at the top of the left and right shaft assemblies.
The wheel force transducer connects the left cable drum to the left crank.
Wheel Backdrive Actuators
Two wheel backdrive actuators connect to the cranks on the left and right shaft assemblies. The backdrive actuators are part of the autopilot system. See the autopilot flight director system section for more information on the backdrive actuators (SECTION 22-11).
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AILERON AND FLAPERON CONTROL -FORWARD CONTROLS
Wheel Damper
The left shaft assembly connects to a wheel damper. The wheel damper absorbs control wheel vibrations.
Feel and Centering Mechanism
The feel and centering mechanism is at the bottom of the left shaft assembly. The aileron trim actuator connects directly to the feel and centering mechanism.
Travel Stops
Travel stops are at the bottom of the shaft assemblies. They limit the shaft assemblies, cable drums and position transducers movement to 65 degrees of control wheel travel.
Spoiler Control Quadrant
The spoiler control quadrant is at the bottom of the right shaft assembly. The spoiler control quadrant connects by a pair of cables to the controls of spoilers 4 and 11.
See the spoiler and speedbrake control section for more information (SECTION 27-61).
Training Information Point
You use four rig pins to adjust the system.
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AILERON AND FLAPERON CONTROL -FORWARD CONTROLS
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AILERON AND FLAPERON CONTROL -CONTROL WHEEL
Purpose
The flight crew uses two control wheels for roll control command.
Physical Description
The control wheels are 12.25 inch diameter cast assemblies. They are conventional in design. The outboard side of each wheel contains the pitch trim switches and the autopilot disconnect switches. An aileron trim indicator placard is on the top of the control wheel.
A maintenance access cover on the control column permits inspection of the cables.
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