CENTRALIZED FAULT DISPLAY SYSTEM (CFDS). ENGINE SYSTEMS - ECU.
Aircraft status - ECU memory.
Storage of internal and external fault data in BITE memory is a function of aircraft status.
NULL : No data is stored.
DC2 : Data for all internal faults only will be stored in appropriate areas.
DC1 : Data for all internal and external faults will be stored in appropriate areas.
Flight leg counting and storage processing is done at the start of the flight at the NULL to DC2 transition. The current flight leg (or, last leg if on ground) is identified by 00 on the menu mode display. The previous flight legs increment from 01 to 63.
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION CFDS MESSAGE
INTERROGATION
FAULT DETECTION
& ANNUNCIATION Page 16
Nov 02
CFM56-5B TRAINING MANUAL
CTC-231-073-00 A/C STATUS - ECU MEMORY FAULT STORAGE
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION CFDS MESSAGE
INTERROGATION
FAULT DETECTION
& ANNUNCIATION Page 17
Nov 02
CFM56-5B TRAINING MANUAL
CENTRALIZED FAULT DISPLAY SYSTEM (CFDS). ENGINE SYSTEMS - ECU.
Last leg report (Leg 00).
The last leg report format (class 1 and 2 faults only) contains the identity of each faulty LRU, the flight leg (always 00), the date and time at which the fault occurred and the ATA reference number.
A maximum of three faults are displayed per page and the faults are displayed in chronological order with the oldest fault first.
If no faults were recorded during the last flight, a ‘NO FAULTS RECORDED’ message is displayed.
When there is an NVM failure, the ECU will display a ‘DATA NOT RETRIEVABLE’ message.
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION CFDS MESSAGE
INTERROGATION
FAULT DETECTION
& ANNUNCIATION Page 18
Nov 02
CFM56-5B TRAINING MANUAL
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