CLASS 1 NO GO.
CONDITION DOES NOT SATISFY DISPATCH CRITERIA. SHOULD BE CORRECTED PRIOR TO AIRCRAFT DISPATCH.
CLASS 2 TIME LIMITED.
AIRCRAFT CAN BE DISPATCHED, BUT SHOULD BE CORRECTED BEFORE TIME LIMITS SPECIFIED IN AIRCRAFT MAINTENANCE MANUAL.
CLASS SM LONG TIME.
TIME LIMITED CONDITION.
MUST BE CORRECTED AT NEXT A CHECK.
CLASS 3 UNLIMITED.
MAY REMAIN UNREPAIRED DURING THE ENTIRE AIRCRAFT LIFE.

 
CTC-231-071-00 ECU FAULT CLASS ASSIGNMENTS
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION CFDS MESSAGE
INTERROGATION
FAULT DETECTION
& ANNUNCIATION Page 13
Nov 02
  
 
  CFM56-5B TRAINING MANUAL

 
CENTRALIZED FAULT DISPLAY SYSTEM (CFDS). ENGINE SYSTEMS - ECU.
ECU BITE memory structure & fault storage.
Internal and external class 1, 2, 3 and SM faults data isolated during Normal Mode operation is stored in BITE memory and the entire contents can be retrieved by shop maintenance test equipment.
The BITE memory structure is divided into five zones and each zone is treated as a circular buffer. The oldest data is overwritten by incoming data. Data from one zone will not be stored in another zone. Class 1 and 2 fault data is divided between zones 1 and 2.
Zone 1 : NVM - Contains failure identification of the 12 most recent class 1, or 2 isolated faults that occurred during the previous 64 flights. This zone contains the fault number, flight leg (0-63) and number of fault occurrences (up to 4).
Zone 2 : NVM - Contains snapshot data corresponding to the 12 class 1 and 2 faults stored in zone 1.
Zone 3 : Reserved RAM - contains failure identification of the 12 most recent class 1, 2, 3, or SM isolated faults that occurred during the ECU test, or thrust reverser test.
This zone contains the fault number, flight leg (0), number of occurrences (up to 4), the GMT and date data.
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION
 
  CFM56-5B TRAINING MANUAL

ZONE 1 : NVM (FAULT IDENTIFICATION).
12 MOST RECENT CLASS 1, OR 2 ISOLATED FAULTS DETECTED DURING THE PREVIOUS 64 FLIGHTS. FAULT NUMBER. FLIGHT LEG (0-63). NUMBER OF OCCURRENCES (UP TO 4).
ZONE 2 : NVM (ADDITIONAL FAULT DATA).
SNAPSHOT DATA CORRESPONDING TO THE 12 MOST RECENT CLASS 1, OR 2 ISOLATED FAULTS DETECTED DURING THE PREVIOUS 64 FLIGHTS AND STORED IN ZONE 1.
ZONE 3 : RESERVED RAM (FAULT IDENTIFICATION).
12 MOST RECENT CLASS 1, 2, 3, OR SM ISOLATED FAULTS DETECTED DURING THE ECU TEST, OR THRUST REVERSER TEST
FAULT NUMBER. FLIGHT LEG (0) NUMBER OF OCCURRENCES (UP TO 4).
　
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