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Both ECU channels are able to control torque motor and solenoid output loads, but only the active channel supplies control outputs during normal operation and the standby outputs are not used.
The ECU turns the two engine igniters on, or off, using relay-controlled switches, internal to the ECU.
Each channel of the ECU also provides excitation voltages for the throttle control system resolvers.
 

EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION ECU SIGNALS
FAULT DETECTION
& ANNUNCIATION Page 14
Nov 02
  
 
  CFM56-5B TRAINING MANUAL
 

 
ENGINE
FMV HPTC LPTC VSV VBV TBV BSV SAV FRV 1
IGNITERS
 

 
CTC-231-017-00 ECU OUTPUTS
 
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION ECU SIGNALS
FAULT DETECTION
& ANNUNCIATION Page 15
Nov 02
  
 
  CFM56-5B TRAINING MANUAL

THIS PAGE LEFT INTENTIONALLY BLANK
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION ECU SIGNALS
FAULT DETECTION
& ANNUNCIATION Page 16
Nov 02
  
 
  CFM56-5B TRAINING MANUAL

FAULT DETECTION
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 1 Nov 02
  
 
  CFM56-5B TRAINING MANUAL

 
FAULT DETECTION Signal processing.
Within the ECU, the various inputs from sensors, switches and the aircraft pass through several stages of checks before the values received are finally selected to be used in the control law calculations.
Both ECU channels validate their inputs, process the data and check their outputs identically.
After they have been converted to a digital format, the parametric/discrete values and the ARINC datawords must first pass through a signal and range check logic.
The values are then compared across the CCDL before being selected for control low calculations. The control laws are entirely managed by the ECU software and will not be described here as they have no impact on fault detection.
After the values have been calculated and processed in the control law logic, they pass through to the output stage for transmission to engine, or aircraft systems.
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION
 
  CFM56-5B TRAINING MANUAL

LOCAL CHANNEL
CCDL
CTC-231-018-00 SIGNAL PROCESSING
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
　
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