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777 AIRCRAFT MAINTENANCE MANUAL
RUDDER CONTROL-GENERAL DESCRIPTION
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RUDDER CONTROL-COMPONENT LOCATIONS
General
The rudder control components are in three areas:
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The vertical stabilizer
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The flight deck
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Below the flight deck floor.
Tail Components
The rudder control surface and the rudder PCUs are on the vertical stabilizer. The rudder tab is aft of the rudder. Three PCUs directly connect to the rudder. Access to the PCUs is by access panels on the left side of the vertical stabilizer.
The two gust suppression pressure transducers are near the leading edge of the vertical stabilizer at about half span.
The two modal accelerometers are in the aft fuselage.
Flight Deck Components
The rudder pedals, the rudder pedal adjustment cranks, the rudder trim selector and the manual trim cancel switch are in the flight deck. The rudder trim selector and the manual trim cancel switch are on the P8 aft aisle stand. The TAC switch is on the P5 overhead panel.
Components Below the Flight Deck
The rest of the forward controls are below the flight deck floor and above the nose gear wheel well. These are the:
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Control rods
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Left and right jackshaft assemblies
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Bus rod
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Rudder Feel and centering mechanism
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Rudder trim actuator
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Rudder trim position transducer
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Rudder pedal position transducers
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Pedal damper
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Friction brake
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Backdrive actuators.
Access to these components is through the forward equipment center.
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777 AIRCRAFT MAINTENANCE MANUAL
RUDDER CONTROL-COMPONENT LOCATIONS
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RUDDER CONTROL -ANALOG AND DISCRETE INTERFACES
General
All of the rudder control electrical interfaces in the PFCS go through the ACEs. The ACEs have interfaces with these components:
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Thrust asymmetry compensation switch
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Rudder pedal position transducers
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Rudder trim selector
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Manual trim cancel switch
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Rudder trim actuator
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Rudder trim position transducer
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Gust suppression pressure transducers
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Modal accelerometers
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Rudder PCUs.
The rudder trim actuator connects mechanically with the rudder pedal control system.
Thrust Asymmetry Compensation Switch
The thrust asymmetry compensation (TAC) switch supplies a discrete signal to the C ACE. When the TAC switch is in the AUTO position, the PFCs automatically control the rudder trim actuator to make allowance for asymmetric thrust. TAC does not operate when the TAC switch is in the OFF position.
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Rudder Pedal Position Transducers
There are four rudder pedal position transducers, two for each rudder pedal set. Each transducer is a linear variable differential transformer (LVDT) that sends analog signals to the ACEs. These analog signals are in proportion to the rudder pedal position and their movement.
Rudder Trim Selector, Manual Trim Cancel Switch, Trim Actuator and Position Transducer
The rotary trim selector and the manual trim cancel switch supply discrete signals to the L1 and R ACEs. The ACEs transmit these signals to the PFCs. The PFCs then command through the ACEs the rudder trim actuator to move the rudder pedals and the position transducers. The rudder trim actuator sends a feedback signal to the ACE. The rudder trim position transducer also sends a trim position signal to the ACE.
Gust Suppression Pressure Transducers
Two gust suppression pressure transducers, in the vertical stabilizer, supply analog signals to the L1 and C ACEs. These signals represent the differential pressure across the vertical stabilizer. This is a measure of the aerodynamic force.
Modal Accelerometers
Two modal accelerometers, in the aft body, supply analog signals to the L2 and R ACEs. These signals represent the lateral acceleration of the aft body movement.
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