CTC-231-069-00 EIU MAIN MENU
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION CFDS MESSAGE
INTERROGATION
FAULT DETECTION
& ANNUNCIATION Page 9
Nov 02
CFM56-5B TRAINING MANUAL
CENTRALIZED FAULT DISPLAY SYSTEM (CFDS). ENGINE SYSTEMS - ECU.
Data retrieval.
The ECU interfaces with the CFDIU over ARINC429 databuses, through the EIU, for all fault reporting and maintenance operations.
When using the MCDU to interrogate the Last Leg Report, the data displayed is retrieved from the CFDIU memory.
When using the MCDU to interrogate the System Report/ Test- FADEC 1 A/B & FADEC 2 A/B, the data displayed is retrieved from the respective ECU memory.
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION CFDS MESSAGE
INTERROGATION
FAULT DETECTION
& ANNUNCIATION Page 10
Nov 02
CFM56-5B TRAINING MANUAL
CTC-231-070-00 ECU MAIN MENU
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION CFDS MESSAGE
INTERROGATION
FAULT DETECTION
& ANNUNCIATION Page 11 Nov 02
CFM56-5B TRAINING MANUAL
CENTRALIZED FAULT DISPLAY SYSTEM (CFDS). ENGINE SYSTEMS - ECU.
ECU fault class assignments.
The ECU automatically determines the criticality level of the fault, or combination of faults to establish the dispatch state of the control/indication system, to comply with the engine and aircraft safety objectives.
The ECU assigns different fault classes to those of the aircraft. The ECU fault classes are :
- Class 1 ‘NO GO’.
- Class 2 ‘ TIME LIMITED’.
- Class 3 ‘UNLIMITED’.
- Class SM (Scheduled Maintenance) ‘LONG TIME’.
Class 1 NO GO faults.
This condition does not satisfy dispatch criteria and should be corrected prior to aircraft dispatch. However, there may be possible maintenance, or operational procedures that allow dispatch with the fault(s) and the maintenance manual refers to these particular cases.
Class 2 TIME LIMITED faults.
These conditions are system faults that have no immediate direct impact on the loss of thrust control and satisfy the engine and aircraft safety objectives during the time limitation. The aircraft can be dispatched with these faults, but they should be cleared at an interval that is not greater than the time limitation specified in the Aircraft Maintenance Manual.
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