The friction brake is within the mechanism of the right shaft assembly, between the flight deck floor and the right side of the nose gear wheel well. Access is through the MEC, then along the right side of the nose gear wheel well.
Functional Description
As the right shaft assembly turns, the friction brake creates a resistive force of about 2 lb (0.9 kg) at the rudder pedals. This resistive force is in addition to the force of the feel and centering mechanism.
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RUDDER CONTROL -FRICTION BRAKE
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RUDDER CONTROL -PEDAL DAMPER
Purpose
The pedal damper absorbs rudder pedal vibrations and brings the rudder control system to rest with minimum oscillation.
Physical Description
The pedal damper is an LRU and weighs about 1.6 lb (0.7 kg).
The pedal damper is identical to the wheel damper and the two column dampers. There are four of these identical dampers on the airplane.
The damper is on the structure of the right shaft assembly mechanism. A pair of cranks and a control rod connect the damper shaft to the right shaft assembly. The control rod is not adjustable.
The pedal damper has an input shaft. The pedal damper uses fluid to absorb vibrations that go to the shaft. A window on the pedal damper shows the position of the fluid level indicator.
The damper crank, on the damper shaft, has a pair of rivets. These shear out in case of a jam of the damper.
Location
The damper is on the side of the mechanism of the right shaft assembly, between the flight deck floor and the right side of the nose gear wheel well. Access is through the MEC, then along the right side of the nose gear wheel well.
Functional Description
As the right shaft assembly turns, it turns the shaft of the damper which absorbs the vibration of the rudder pedal control system. The damper adds a small force to the rudder pedal control system.
Training Information Point
Insert a pin through the inspection hole in the damper crank to check the rivet condition.
If the fluid level indicator shows a green band width of 1/16 inch or less, the fluid level is low. Then it is necessary to replace the pedal damper.
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RUDDER CONTROL -MODAL ACCELEROMETERS
Purpose
The modal accelerometers measure the lateral acceleration of the aft fuselage. They send an analog signal to the ACEs.
The modal suppression function of the primary flight control system helps improve the quality of passenger ride in the forward and aft sections of the cabin.
Physical Description
There are two identical modal accelerometers. They are LRUs. Each accelerometer weighs about 0.8 lb (0.36 kg).
An electrical cable connects to a connector on each modal accelerometer.
Each modal accelerometer attaches to a support bracket.
Location
The modal accelerometers are on a cabin floor beam of the aft fuselage. One accelerometer is at each outboard side of the beam.
To get access to the modal accelerometers, it is necessary to remove the sidewall liners of the bulk cargo compartment. The modal accelerometers are outboard of the sidewall stanchions of the bulk cargo compartment.
Functional Description
Lateral movement of the aft fuselage causes a change of the analog signal from the modal accelerometer to the ACE.
Indications
There is no flight deck indication if one or both modal accelerometers are defective.
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RUDDER CONTROL -GUST SUPPRESSION PRESSURE TRANSDUCERS
Purpose
The gust suppression pressure transducers measure the pressure difference between both sides of the vertical stabilizer. They also supply an electrical analog signal to the ACEs.
The gust suppression function helps improve the quality of passenger ride in the aft portion of the fuselage.
Physical Description
There are two identical pressure transducers and four identical pressure ports. The transducers and the ports are LRUs. Each transducer weighs about 2 lb (0.9 kg). 中國航空網 m.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：777 AMM 飛機維護手冊 飛行操縱 Flight Controls 1(52)
