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- the absolute value of the difference between the
demand and valid position is greater than 5%.
- there is not a wrap fault on the local channel. - N2 is greater than 22%.
- the channel is active.
Typical fault message.  VSV ACT, J11, ECU

EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 36
Nov 02
  
 
  CFM56-5B TRAINING MANUAL

SECONDARY COILS FEEDBACK
CTC-231-035-00 VSV CONTROL
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 37
Nov 02
  
 
  CFM56-5B TRAINING MANUAL

 
CONTROL LOOPS Primary excitation groups.
The LVDT, RVDT and resolver primary excitation windings are wired together in groups.
It is possible, therefore, that a fault registered on one primary winding may be caused by a fault on another winding in the same group.
Channel A.
Group 1. Resolver 1 (TRA)
Group 2. Resolver 2 (FMV), HPTC
Group 3. VBV, VSV
Group 4. LPTC, TBV
Channel B.
Group 1. Resolver 1 (TRA)
Group 2. Resolver 2 (FMV), VSV
Group 3. VBV, LPTC
Group 4. HPTC, TBV
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION
 
  CFM56-5B TRAINING MANUAL

 

 CHANNEL A CHANNEL B
GROUP 1 RESOLVER 1 (TRA), RESOLVER 1 (TRA),
GROUP 2 RESOLVER 2 (FMV),
HPTC RESOLVER 2 (FMV),
VSV
GROUP 3 VSV, VBV VBV, LPTC
GROUP 4 LPTC, TBV HPTC, TBV

 
CTC-231-036-00 PRIMARY EXCITATION GROUPS
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 39
Nov 02
  
 
  CFM56-5B TRAINING MANUAL

 
IGNITION MONITORING
The ECU has 2 independent 115 Vac inputs from the airframe, one dedicated to each ignition system.
- The Emergency bus supplies System 1
(J1 - Ch A - upper ignition box ) Right. - The Normal bus supplies System 2
(J2 - Ch B - lower ignition box) Left.
The ignition power supply is automatically disconnected by the EIU if the master lever is selected off, or in case of fire emergency procedure.
Ignition power supply is failsafed to ‘ON’, in the case of a failed EIU.
Each ECU channel has a software-operated ignition on/off switch to operate one exciter/ignitor. Each channel can control the operation of both of these switches.
　
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