EFFECTIVITY BEJ ALL 78-34-00
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D633W101-BEJ May 05/2003
TRAS -LOCKING HYDRAULIC ACTUATORS
The actuators have an internal lead screw and worm wheel which are concentric with the piston. The lead screw turns through a nut that is fastened to the head end of the piston. The piston moves axially and independently from the lead screw. As the piston extends or retracts, the nut on the piston causes the lead screw and worm wheel to turn which turns the worm shaft. The worm shaft is connected to the sync shafts which are connected to the other actuators. The sync shafts synchronize the operation of the other actuators.
Extend Pressure Connections
The extend pressure connection on the center actuator gets extend hydraulic pressure from the directional control valve (DCV).
The extend pressure connection on the lower actuator has a cap. The lower actuator does not use the extend pressure connection. It gets extend hydraulic pressure from the center actuator through the sync shaft tube.
Retract Pressure Connections
The upper retract pressure connection on the center actuator gets retract hydraulic pressure from the directional control valve (DCV) through the upper actuator. The lower actuator gets retract hydraulic pressure from the center actuator.
EFFECTIVITY BEJ ALL Sync Shaft and Tubing Connections
The sync shaft connects the worm shafts of the actuators together. There are connections on both the top and bottom of each actuator. The sync lock/manual drive unit connects to the sync shaft connection on the bottom of the lower actuator. The sync shaft tubing makes a routing for the extend hydraulic pressure.
Gimbal Assembly
A gimbal assembly attaches the head end of the actuator to the forward side of the thrust reverser torque box. You must open the fan cowl to get access to the gimbal assembly.
Lock Release Lever and Lever Lock Pin
The lock release handle turns the internal lever which pulls the lock sleeve against spring force to release the lock keys in the actuator. The lever lock pin holds the lever and the handle in the not locked position. This permits the manual movement of the thrust reverser sleeve.
Actuator Lock Proximity Sensor
The actuator lock proximity sensor uses a target mounted on the lock release handle to sends lock position data to the T/R indicating and fault detection system. The signal from the sensor will indicate target NEAR for the lock position and target
FAR for the unlock position. See section 78-36 for more
information.
78-34-00
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TRAS -LOCKING HYDRAULIC ACTUATORS
Rod End
The rod end of the actuator attaches to the thrust reverser sleeve. You get access to the rod end through the access panels on the side of the thrust reverser sleeve. 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 发动机排气 Engine Exhaust PW 777 AIRCRAFT MAINTENANCE MANUAL(37)
