CTC-231-037-00 IGNITION MONITORING
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 41 Nov 02
CFM56-5B TRAINING MANUAL
THRUST REVERSER
In response to the throttle resolver setting (TRA), the ECU provides the following functions :
- Control of the thrust reverser deploy and stow.
- Thrust limiting during reverser transition and after a failure has been detected.
- Thrust reverser system monitoring, including the T/R shut-off valve (TRSOV), which isolates the T/R from system pressure.
- Fault identification for accommodation and communication, via ARINC outputs, to the aircraft systems.
The reverser logic is based on throttle lever position, flight/ground status, engine running status, mach number and reverser position.
Each ECU channel is able to monitor and control the thrust reverser.
The ECU causes the T/R to deploy by energizing both the T/R Directional Valve (TRDV) solenoid and the T/R Pressurizing Valve (TRPV) solenoid, when the A/C is on ground, the engine is running and the TRA is less than or equal to -4.3 degrees. When all four doors are detected fully deployed, the ECU de-energizes the TRPV solenoid.
The ECU causes the T/R to stow by energizing the TRPV and de-energizing the TRDV, when the A/C is on ground, the engine is running, the TRA becomes greater than -4.3 degrees, N1 is below 71% and either, the reverser position is indeterminate and the reverser system is inadvertently pressurized, or at least one door is detected unstowed.
Failure detection for the T/R control consists of :
- TRDV circuit failures,
- TRDV A/C inhibition switch circuit failures,
- TRPV circuit failures,
- pressurized switch failures,
- position switch circuit failures,
- lock failures,
- TRSOV failure.
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 42
Nov 02
CFM56-5B TRAINING MANUAL
STOW
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LEVER
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