CHANNEL SELECTION Output driver control.
Each channel’s selection logic interrogates the channel-health 32-bit word, received over the CCDL, in order to select the healthiest channel as active.
The output drivers are disconnected in the stand-by channel, but if a fault is detected in the active channel, the ECU changes the channel in control, provided that the other channel has no faults with a higher priority.
If the channel selected as active also has a fault, but of a lower priority, the channel disconnects the corresponding driver output and the ECU loses electronic control of that function.
In this case, a null current is supplied to the torque motor, or solenoid driver of the pilot valve in the HMU. The pilot valve will then hydraulically move the valve (VSV, VBV, HPTC, etc) to a position, which protects the engine.
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
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EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 58
Nov 02
CFM56-5B TRAINING MANUAL
WARNING INDICATIONS
WARNING
INDICATIONS
FAULT DETECTION
& ANNUNCIATION
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION Page 1 Nov 02
CFM56-5B TRAINING MANUAL
WARNING INDICATIONS
Depending on the data transmitted from the engine, messages are generated on the :
- Upper ECAM : Engine Warning Display (EWD). - Lower ECAM : Systems Display (SD).
- Master caution, or warning.
- Audible chimes and oral warnings.
These messages are used to run the engine under normal conditions throughout the operating range, or to provide warning messages to the crew and maintenance personnel.
The aircraft computers that impact the engine are :
- 2 System Data Acquisition Concentrators (SDAC).
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