The actuator lock proximity sensors are on the forward end of each locking hydraulic actuator. You open the fan cowl panels to get access to the sensors.
Physical Description
There two parts: a proximity sensor and a target. The proximity sensor is mounted in a flange on the body of the actuator. The target is part of the lock release lever for the locking actuator. An electrical connector is connected to the end of the sensor.
Functional Description
When the locking actuators get deploy hydraulic pressure, the locking sleeve in the actuator moves to the unlock position which also moves the lock release lever to the unlock position. The target on the lever moves away from the proximity sensor. This sends a signal to the proximity sensor electronic unit (PSEU). The signal from the sensor will indicate target NEAR for the lock position and target FAR for the unlock position.
If the locking sleeve is not locked when the thrust reverser is in the retracted position, fault indication shows on the flight deck and a maintenance message is latched.
Training Information Point
The gap between the proximity sensor and the target is 0.030 –
0.035 inch (0.0076 – 0.0089 mm) for new actuators. The in-service limit for the gap between the proximity sensor and the target can be 0.022 -0.043 inch (0.0056 -0.0109 mm) after replacement of the proximity sensor on actuators in-service.
EFFECTIVITY BEJ ALL 78-36-00
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D633W101-BEJ May 05/2003
T/R INDICATING AND FAULT DETECTION -ACTUATOR LOCK PROXIMITY SENSOR
EFFECTIVITY BEJ ALL 78-36-00
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D633W101-BEJ Sep 05/2002
T/R INDICATING AND FAULT DETECTION -SYNC LOCK PROXIMITY SENSOR
General
The sync lock proximity sensor monitors the position of the sync lock which attaches to each lower locking hydraulic actuator. It sends the position data to the proximity sensor electronic unit (PSEU).
Each thrust reverser sleeve has one sync lock proximity sensor.
Location
The sync lock/manual drive unit is the same identical unit on the left and right thrust reverser half. When the sync lock/manual drive unit is installed on the left thrust reverser half, the lock release lever, proximity sensor and the electrical connections are between the unit and the forward torque box. When the unit is installed on the right thrust reverser half, the lock release lever, proximity sensor and the electrical connections are away from the forward torque box. You open the fan cowl panels to get access to the sensors.
Physical Description
There are two parts: the sync lock proximity sensor and a target. The target is mounted on the lock release lever on the sync lock/manual drive unit. 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(52)
