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RUDDER CONTROL -ANALOG AND DISCRETE INTERFACES
Rudder PCUs
Each of the three rudder PCUs receives analog and discrete electrical signals from the ACEs. The discrete signals go to:
*
The pressure reducer solenoid
*
The bypass solenoid
*
The damped solenoid.
The analog signal goes to the electrohydraulic servo valve (EHSV).
Each of the three rudder PCUs sends analog feedback signals to the ACEs. These signals are from the EHSV position LVDT, the actuator position LVDT, the actuator null LVDT and the differential pressure LVDT.
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RUDDER CONTROL -ANALOG AND DISCRETE INTERFACES
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RUDDER CONTROL -FORWARD CONTROLS
General
The forward controls of the rudder control system include:
*
The rudder pedal arms and jackshaft assemblies
*
The rudder pedal position transducers
*
The backdrive actuators
*
The feel and centering mechanism
*
The rudder trim actuator
*
The friction brake
*
The pedal damper
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The connection to the nose wheel steering
*
The travel stops.
Rudder Pedal Arms and Jackshaft Assemblies
The rudder pedal arms connect by control rods to the jackshaft
assemblies. The two jackshaft assemblies connect with a bus
rod. Each jackshaft assembly contains a rudder pedal
adjustment mechanism to permit each pilot to adjust the
pedals to the most comfortable position.
Each jackshaft assembly connects with control rods and cranks to the left and right shaft assemblies.
There is no jam override mechanism for the rudder pedals. However, the control rods that connect the pedals to the jackshaft assemblies each have a one-way pogo. These supply some relief from jams that may occur as a result of a bird strike through the forward bulkhead.
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Rudder Pedal Position Transducers
Four rudder pedal position transducers, installed on the airframe structure, connect to cranks on the left and right shaft assemblies.
Backdrive Actuators
Two backdrive actuators connect to a crank 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).
Feel and Centering Mechanism
The feel and centering mechanism is on the left shaft assembly.
Rudder Trim Actuator
The rudder trim actuator connects to the feel and centering mechanism. The rudder trim position transducer connects to the lever of the rudder feel and centering mechanism.
Friction Brake
A friction brake connects with a crank to the right shaft assembly. The friction brake supplies a resistance to the movement of the rudder pedal control mechanism.
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RUDDER CONTROL -FORWARD CONTROLS
Pedal Damper
A pedal damper connects with a crank to the right shaft assembly. The damper absorbs oscillations of the rudder pedal control mechanism.
Connection to Nose Wheel Steering
A crank and a connecting rod, from the right jackshaft assembly, supply the rudder pedal command to the nose wheel steering system. See the nose gear steering system section for more information (SECTION 32-51).
Travel Stops
Travel stops are at the aft end of the left and right shaft assemblies. They keep the movement of the rudder control system to a limit of 3.5 inches of rudder pedal movement in both directions.
Training Information Point
Rig pins lock the rudder forward controls during adjustment of the rudder control system.
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RUDDER CONTROL -FORWARD CONTROLS
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RUDDER CONTROL -PEDAL ASSEMBLY
Purpose
The rudder pedals get the pilot commands and transmit them to the rudder control system.
Physical Description
The rudder pedals are conventional in design. Each pilot has two pedals. The pedals of each pair move in opposite direction of each other. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：777 AMM 飞机维护手册 飞行操纵 Flight Controls 1(48)
