*
Non-locking.

Each thrust reverser half has two locking actuators and one non-locking actuator.
Sync Shafts and Tubing

There is an upper and lower sync shaft and tubing on each thrust reverser half.
The sync shaft tubing contains the sync shaft. The tubing also makes a routing for the TRAS extend hydraulic pressure to go from the center actuator to the upper and lower actuators.
EFFECTIVITY BEJ ALL  78-34-00 
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D633W101-BEJ  May 05/2003 

TRAS -HYDRAULIC ACTUATORS, SYNC SHAFTS AND TUBING -INTRODUCTION

EFFECTIVITY BEJ ALL  78-34-00 
Page 29 
D633W101-BEJ  May 05/2003 

TRAS -LOCKING HYDRAULIC ACTUATORS

General

The thrust reverser actuation system (TRAS) uses six hydraulic actuators to extend and retract the T/R sleeves for each engine. There are four locking actuators for each engine.
The sync shafts make sure the actuators on each sleeve move together.
Purpose
The locking hydraulic actuators have these functions:
*
Extend the thrust reverser sleeves

*
Retract the thrust reverser sleeves

*
Lock the thrust reverser sleeves in the retracted position.

Location

Each thrust reverser half has a center and lower 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 electrical connector for the actuator lock proximity sensor, the actuator lock lever and lock pin, 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 locking actuators have these parts and connections:
*
Extend pressure connections

*
Retract pressure connections

*
Sync shaft and tubing connections

*
Gimbal assembly

*
Lock release lever and lever lock pin

*
Actuator lock proximity sensor

*
Rod end.

The locking actuator weighs approximately 31.9 pounds (14.5 kilograms). Fully retracted, the actuator length is 47.8 inches (1214 millimeters). Full extension stroke for the actuator is approximately 30 inches (762 millimeters).
The locking actuator contains an internal lock mechanism that prevents piston movement. When the actuator is stowed and locked, an internal lock spring positions a lock sleeve that holds the lock keys radially in slots in the piston. When deploy hydraulic pressure is applied, the lock sleeve moves in the opposite direction from the piston, against the spring force, which releases the keys. As the piston extends, the piston forces the lock keys radially outward and a lock spring follower on the lead screw prevents the keys from engaging during the piston extension and retraction.
　
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