EFFECTIVITY BEJ ALL  78-36-00 
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D633W101-BEJ  Sep 05/2002 

THRUST REVERSER (T/R) INDICATING AND FAULT DETECTION -INTRODUCTION

EFFECTIVITY BEJ ALL  78-36-00 
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D633W101-BEJ  Sep 05/2002 

T/R INDICATING AND FAULT DETECTION -GENERAL DESCRIPTION

General

The thrust reverser indicating and fault detection system monitors the thrust reverser actuation system (TRAS). It sends the linear position data for the thrust reverser sleeve, the position of the locks in the locking hydraulic actuators and the sync lock/manual drive unit and the position data for the directional control valve (DCV) and the isolation valve (IV) to the electronic engine control (EEC) and the proximity sensor electronics unit (PSEU).
EEC Data

The thrust reverser indicating and fault detection system sends this data to the electronic engine control (EEC):
*
Thrust reverser isolation valve (IV) position with the hydraulic pressure switch

*
Thrust reverser sleeve position with the rotary variable differential transducer (RVDT).

The electronic engine control (EEC) uses the isolation valve hydraulic pressure switch data to monitor the position (open or closed) of the IV. The electronic engine control (EEC) uses the RVDT data to make sure the thrust reverser sleeves are in the correct position before you can increase thrust from idle.
The electronic engine control (EEC) sends data to the AIMS for these indications:
* Normal extend and retract indication
* Alert, status, and maintenance messages if the position of the isolation valve or the thrust reverser sleeve is not correct.
PSEU Data
The thrust reverser on each engine has seven proximity sensors. They send this data to the proximity sensor electronics unit (PSEU):
*
Directional control valve (DCV) position (extend or retract)

*
Locking hydraulic actuator positions (locked or not locked)

*
Sync lock positions (locked or not locked).

The proximity sensor electronics unit (PSEU) sends the data to the AIMS to make alert, status, and maintenance messages for non-normal conditions.

EFFECTIVITY BEJ ALL  78-36-00 
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D633W101-BEJ  May 05/2003 

T/R INDICATING AND FAULT DETECTION -GENERAL DESCRIPTION

EFFECTIVITY BEJ ALL  78-36-00 
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D633W101-BEJ  Sep 05/2002 

T/R INDICATING AND FAULT DETECTION -COMPONENTS

General

All thrust reverser indication and fault detection components are on the forward torque box of the thrust reverser. You open the fan cowl panels to get access to these components.
Components

There is one thrust reverser position transducer or rotary variable differential transducer (RVDT) on the upper, non-locking hydraulic actuator of each thrust reverser half. The RVDT is installed opposite the sync shaft connection to the actuator.
　
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