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The ECU performs input conversion checks (resolver sine and cosine signals to TRA degrees) and the input is rejected if a conversion fault is detected, or the value is outside the minimum/maximum range limits.
Validated channel A & B inputs are compared across the CCDL and if they are in agreement, the average is selected. The comparison difference is 3.0 degrees.
If there is a cross channel signals disagree for more than 1 second, the ECU generates a fault message and
TRA selection is a function of flight/ground status and the selected throttle position at the time of fault detection.
Typical fault message :
TLA SNSR, J3, ECU in conjunction with
TLA SNSR, J4, ECU
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION
 
  CFM56-5B TRAINING MANUAL

STATUS SELECTED THROTTLE POSITION AT THE TIME OF FAULT DETECTION
 REVERSE IDLE THRU MAX CONT FLX/DRT TAKEOFF MAX TAKEOFF
GROUND SELECT TLA CLOSEST TO, BUT NO GREATER THAN FORWARD IDLE SELECT TLA = FORWARD IDLE SELECT LARGER TLA SELECT LARGER TLA
FLIGHT NOT IN APPROACH PHASE : SELECT TLA CLOSEST TO, BUT NO GREATER THAN MAX CONT.
IN APPROACH PHASE : SELECT TLA = FORWARD IDLE. NOT IN APPROACH PHASE : SELECT TLA CLOSEST TO, BUT NO GREATER THAN MAX CONT.
IN APPROACH PHASE : SELECT TLA = FORWARD IDLE. SELECT LARGER TLA SELECT LARGER TLA

TYPICAL FAULT MESSAGE
"TLA SNSR, J3, ECU" IN CONJUNCTION WITH "TLA SNSR, J4, ECU"
CTC-231-028-00 TRA SIGNALS DISAGREE
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 23
Nov 02
  
 
  CFM56-5B TRAINING MANUAL

SIGNALS DISAGREE BSV switch disagree.
The ECU checks the Burner Staging Valve switch positions for a signals disagree.
A fault message is generated if ;
- Switch 1 signals disagree between channels A & B, or,
- Switch 2 signals disagree between channels A & B, or,
- Switch 1 signals disagree with switch 2 signals.
Typical fault message.  BSV, J11/J12, ECU
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 24
Nov 02
  
 
  CFM56-5B TRAINING MANUAL

CTC-231-029-00 POSITION SIGNALS DISAGREE (BSV)
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 25
Nov 02
  
 
  CFM56-5B TRAINING MANUAL

 
OUTPUTS Wraparound.
　
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