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Retract the thrust reverser sleeves
Location
Each thrust reverser half has an upper non-locking actuator. The actuator is attached to the thrust reverser torque box at the gimbal assembly and the thrust reverser sleeve with the actuator rod end.
You get access to the hydraulic connections, the sync shaft tubing, and the gimbal assembly through the fan cowl panels.
You get access to the actuator rod end that attaches to the thrust reverser sleeve through the small, circular access panels on the side of the thrust reverser sleeve.
Physical Description
The non-locking actuators have these parts and connections:
*
Retract pressure connections
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Sync shaft and tubing connections
*
Gimbal assembly
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Rod end
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Rotary variable differential transducer (RVDT).
The non-locking actuator weighs approximately 27.3 pounds
(12.4 kilograms). Fully retracted, the actuator length is 44.9 inches (1140 millimeters). Full extension stroke for the actuator is approximately 30 inches (762 millimeters).
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.
Retract Pressure Connections
The upper retract pressure connection on the upper actuator gets retract pressure from the directional control valve (DCV). The lower retract pressure connection sends retract pressure to the center actuator.
EFFECTIVITY BEJ ALL 78-34-00
Page 34
D633W101-BEJ May 05/2003
TRAS -NON-LOCKING HYDRAULIC ACTUATORS
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 shaft tubing makes a routing for the extend hydraulic pressure. The center actuator sends extend pressure to the upper actuator through the sync shaft tubing.
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.
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.
T/R Position Transducer (RVDT)
The rotary variable differential transducer (RVDT) attaches to the upper sync shaft and tubing connection. The drive mechanism in the upper actuator turns the RVDT. The RVDT sends thrust reverser sleeve position data to the EEC for control and indication functions. See section 78-36 for more information. 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(39)
