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The actuator lock proximity sensor is on the forward part of center and lower locking hydraulic actuator of each thrust reverser half. The proximity sensor uses a target on the lock release lever.
The sync lock proximity sensor is on the thrust reverser sync lock/manual drive unit. The sync lock/manual drive unit is installed opposite the sync shaft connection to the lower, locking hydraulic actuator on each thrust reverser half. The proximity sensor uses a target on the lock release lever.
The directional control valve proximity sensor is mounted in the directional control valve (DCV). The proximity sensor senses the position of the auxiliary slide in the valve.
The thrust reverser hydraulic pressure switch is mounted on the TRAS PRESS port on the isolation valve.

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T/R INDICATING AND FAULT DETECTION -COMPONENTS

EFFECTIVITY BEJ ALL  78-36-00 
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T/R INDICATING AND FAULT DETECTION -HYDRAULIC PRESSURE SWITCH AND DCV PROXIMITY SENSOR

Hydraulic Pressure Switch

The hydraulic pressure switch monitors the pressure out of the isolation shutoff valve. It sends a signal to the EEC when the isolation valve is open. If the isolation valve is open when there is no command to extend or retract the reverser, the EEC sends a signal to the AIMS to show an alert or status message.
The hydraulic pressure switch is on the forward, left side of the isolation valve. It is near the hydraulic tube that connects to the DCV.
DCV Proximity Sensor

The DCV sensor monitors the position of the directional control valve. The position data goes to the PSEU. If the DCV is in the extend position when there is a retract command, the PSEU sends a signal to the AIMS for fault indication on the flight deck.
The DCV sensor is on the left side of the DCV.

The sensor is a proximity switch. It monitors the position of the spool valve in the DCV (not shown). When the DCV is in the extend position, the spool valve is away from the sensor. When the DCV is in the retract position, the spool valve is near the sensor.
Training Information Point
The hydraulic pressure switch is a LRU. To replace the switch, you do not have to remove the isolation valve or disconnect any hydraulic tubes.

EFFECTIVITY BEJ ALL  78-36-00 
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T/R INDICATING AND FAULT DETECTION -HYDRAULIC PRESSURE SWITCH AND DCV PROXIMITY SENSOR

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

General

The actuator lock proximity sensor monitors the position of the locking sleeve in each locking hydraulic actuator. It sends the position data to the proximity sensor electronic unit (PSEU).
　
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