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Functional Description
When the sync lock gets hydraulic pressure from the sync lock valve, the sliding jaw disengages the locking jaw and moves the lock release lever to the unlock position. The target moves away from the proximity sensor. This sends a signal to the proximity sensor electronic unit (PSEU) that the actuator is not locked.
If the sync lock 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
When you install a new proximity sensor, you must do a check of the gap between the proximity sensor and the target. There is a nut on the lock release lever so you can adjust the gap.

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T/R INDICATING AND FAULT DETECTION -SYNC LOCK PROXIMITY SENSOR

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PW4000 SERIES ENGINES

 

777 AIRCRAFT MAINTENANCE MANUAL

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Page 14 D633W101-BEJ May 05/2003

T/R INDICATING AND FAULT DETECTION -T/R POSITION TRANSDUCER (RVDT)

General

The thrust reverser position transducer is the rotary variable differential transducer (RVDT). The RVDT sends the thrust reverser sleeve position data to the electronic engine control (EEC). The EEC will not permit more than idle thrust if the sleeves are less than 60 percent of full extension. The EEC also uses the position data to supply flight deck indication of when the sleeve is not in the fully retracted position, when the sleeve is fully extended, for fault detection and to determine the interlock relay command for the reverse thrust lever interlock actuator.
There is one RVDT on the upper, non-locking hydraulic actuator of each sleeve. Thus, each engine has two RVDTs.
Location

The RVDT is installed on the upper sync shaft flange on each non-locking actuator. You open the fan cowl panels to get access to the RVDTs.
Physical Description
The RVDT has two parts; the transducer and the gearbox. The RVDT is replaced as one unit. The RVDT weighs approximately
2.4 pounds (1.08 kg). The RVDT gearbox is a sealed housing that is installed on the upper hydraulic actuator. The RVDT gearbox in operation is filled with hydraulic fluid. When the RVDT is replaced, the packing between the backup rings on the gearbox must be replaced. The gearbox has a square drive shaft that engages the worm shaft in the non-locking actuator. Internal seals on the gearbox shaft prevents hydraulic fluid contamination of the transducer. The transducer has an electrical connector.
Functional Description
Each RVDT has two sets of coils for channel A and B. The EEC gives an excitation voltage to each channel and receives an output analog signal from the RVDT for that channel.
　
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