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Deploy switches.
The ECU interfaces with 8 deploy switches (1 double switch per T/R door), connected in 2 identical series circuits of 4 switches. Each circuit of 4 deploy switches provides 1 input to the ECU. Both ECU channels have direct hardwired access to both series circuits inputs. The input is designated TRD.
Detection.
The ECU detects failures in the position switch circuits
by comparing the 6 available inputs and identifying inputs which disagree. A position status is assigned based on :
- the 6 inputs (stow and deploy switches), when in
reverse, or on ground.
- the 4 stow inputs, when in flight, or forward on ground.
 
Based on the 6 inputs, a maintenance status is assigned. The ECU detects failures of the position switch circuits by determining the position of the thrust reverser from those inputs that agree.
When a decision cannot be made, the ECU assigns an indeterminate status to the T/R selected position parameter. In this state, the logic will continue its attempts to move the doors to the proper position.
The thrust reverser maintenance status parameter indicates the most probable location of any switch circuit failure.
Typical fault message.
STOW SW, J5/J6, ECU DEPL SW, J5/J6, ECU DPLSTW SW, J5/J6, ECU
 

EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 48
Nov 02
  
 
 
CFM56-5B TRAINING MANUAL
 

 
CTC-231-041-00 STOW/DEPLOY SWITCHES
 
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 49
Nov 02
  
 
  CFM56-5B TRAINING MANUAL

THRUST REVERSER Deploy failures.
During a normal thrust reverser deployment cycle, the 4 doors should move from the fully stowed position to fully deployed.
An open circuit in the TRDV 28Vdc supply circuit will prevent the thrust reverser from deploying when commanded.
Likewise, a failure in a door lock, or actuator, may prevent deployment of that door.
Typical fault messages.  TR LOCK, TR ACT EIU, HCU
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 50
Nov 02
  
 
 
CFM56-5B TRAINING MANUAL
 

 
CTC-231-042-00 DEPLOY FAULTS
 
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 51 Nov 02
  
 
  CFM56-5B TRAINING MANUAL
　
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