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CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 11 Nov 02
  
 
 
FEEDBACK LOOPS RVDT/LVDT.
The ECU checks the output voltage validity and generates a fault message if :
- V1 or V2 is out of range.
or,
- the sum of V1 + V2 is out range.
or,
- the calculated position is out of range.
Typical fault message.  VSV ACT, J11, ECU VBV SNSR, J12, ECU
 
CFM56-5B TRAINING MANUAL
Resolver.
The ECU checks the output voltage validity and generates a fault message if :
- V1 or V2 is out of range.
or,
- the sum of V12 + V22 is out range.
or,
- the calculated position is out of range.
Typical fault message.
J7, HMU(FMVRES), ECU
 

EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 12
Nov 02
  
 
  CFM56-5B TRAINING MANUAL

TYPICAL FAULT MESSAGE: "VSV ACT, J11, ECU"
TYPICAL FAULT MESSAGE: "J7, HMU (FMVRES), ECU"
CTC-231-023-00 FEEDBACK LOOPS
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 13
Nov 02
  
 
  CFM56-5B TRAINING MANUAL

 
OSG VALIDATION Overspeed governor switch.
During startup, the ECU checks the state of the mechanical overspeed governor switch in the HMU.
The OSG switch is closed at zero engine speed. The overspeed governor begins to translate at 5554 RPM and the OSG switch should be open by 7000 RPM.
A fault message is generated and a fault flag set if :
- the N2 signal is valid,
and,
- the aircraft is on ground,
and,
- the fault persists for more than 1 second,
and either,
- the local channel OSG switch indicates open at
3000 RPM,
or,
- the local channel OSG switch indicates closed at 7500 RPM.
Typical fault message.
HMU (OSG), J7
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION
 
  CFM56-5B TRAINING MANUAL

TYPICAL FAULT MESSAGE "HMU (OSG), J7"
CTC-231-024-00 OSG SWITCH
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 15
Nov 02
  
 
  CFM56-5B TRAINING MANUAL

IDENTIFICATION PLUG VALIDATION
The information contained in the engine ID plug is coded by a combination of open/closed discretes and includes identification and configuration for :
　
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