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When both T/R sleeves are 90 percent extended, the EEC sends a signal to the AIMS to change the amber REV indication to a green REV indication. This tells the flight crew that the T/R is fully extended. The EEC will permit maximum thrust based on the command from the flight crew.
The EEC does a rate check, range check, crosscheck and signal noise on the position data to make sure the RVDT data is valid.

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T/R INDICATING AND FAULT DETECTION -FUNCTIONAL DESCRIPTION -EEC INPUTS

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T/R INDICATING AND FAULT DETECTION -FUNCTIONAL DESCRIPTION -PSEU INPUTS

General

The proximity sensor electronics unit (PSEU) gets data from these sensors to make sure the actuators and valves are in the correct positions:
*
Directional control valve (DCV) proximity sensor

*
Actuator lock proximity sensor

*
Sync lock proximity sensor.

 

The PSEU sends signals to the airplane information management system (AIMS) through the systems ARINC 629 data buses.
Sensors Show Not Locked

If any of the locks are not locked and the sleeve is in the retracted position, the AIMS shows advisory and status messages.
If the directional control valve (DCV) is in the extended position without an extend command, the AIMS shows advisory and status messages.
Sensor Failure

If there is a single failure in a sensor, or in a sensor circuit, the AIMS shows the ENG REVERSER SNSR L(R) status message. The AIMS also makes a central maintenance computer system (CMCS) maintenance message.
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details. 

 

T/R INDICATING AND FAULT DETECTION -FUNCTIONAL DESCRIPTION -PSEU INPUTS

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