1. Possible Causes
_______________
 - SDAC-1 (1WV1)

 - GCU-2 (1XU2)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 24-22-34-000-001 Removal of the GCU-1(2) (1XU1, 1XU2)
 AMM 24-22-34-400-001 Installation of the GCU-1(2) (1XU1, 1XU2)
 AMM 31-50-00-710-001 Ground Scanning of the Central Warning System
 AMM 31-55-34-000-001 Removal of the SDAC (1WV1,1WV2)
 AMM 31-55-34-400-001 Installation of the SDAC (1WV1,1WV2)

 3. Fault Confirmation
__________________
 A. Do the ground scanning of the central warning system (Ref. AMM TASK 31-50-00-710-001).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance message:
 SDAC1: NO DATA FROM GCU2

 (1) Replace the SDAC-1 (1WV1) (Ref. AMM TASK 31-55-34-000-001) and (Ref. AMM TASK 31-55-34-400-001).

 (2) If the fault continues:

 - replace the GCU-2 (1XU2) (Ref. AMM TASK 24-22-34-000-001) and (Ref. AMM TASK 24-22-34-400-001).

 (3) If the fault continues:

 - do a check and repair the wiring between the GCU2 (1XU2) and the SDAC1 (1WV1).
 B. Do the test given in Para. 3.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : 106-149, 229-299, 303-399, 401-499, ∞∞31-54-00∞∞∞∞∞∞∞∞∞∞Page A271
 Aug 01/05 CES Loss of the GCU2 Bus of the SDAC2

 1. Possible Causes
_______________
 - SDAC-2 (1WV2)

 - GCU-2 (1XU2)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 24-22-34-000-001 Removal of the GCU-1(2) (1XU1, 1XU2)
 AMM 24-22-34-400-001 Installation of the GCU-1(2) (1XU1, 1XU2)
 AMM 31-50-00-710-001 Ground Scanning of the Central Warning System
 AMM 31-55-34-000-001 Removal of the SDAC (1WV1,1WV2)
 AMM 31-55-34-400-001 Installation of the SDAC (1WV1,1WV2)

 3. Fault Confirmation
__________________
 A. Do the ground scanning of the central warning system (Ref. AMM TASK 31-50-00-710-001).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance message:
 SDAC2: NO DATA FROM GCU2

 (1) Replace the SDAC-2 (1WV2) (Ref. AMM TASK 31-55-34-000-001) and (Ref. AMM TASK 31-55-34-400-001).

 (2) If the fault continues:

 - replace the GCU-2 (1XU2) (Ref. AMM TASK 24-22-34-000-001) and (Ref. AMM TASK 24-22-34-400-001).

 (3) If the fault continues:

 - do a check and repair the wiring between the GCU2 (1XU2) and the SDAC2 (1WV2).
 B. Do the test given in Para. 3.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : 106-149, 229-299, 303-399, 401-499, ∞∞31-54-00∞∞∞∞∞∞∞∞∞∞Page A272
 Aug 01/05 CES

 TASK 31-54-00-810-952
 Unwanted Display of the CABIN READY Memo

 1. Possible Causes
_______________
 - SDAC-1 (1WV1)

 - SDAC-2 (1WV2)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 31-55-34-000-001 Removal of the SDAC (1WV1,1WV2)
 AMM 31-55-34-400-001 Installation of the SDAC (1WV1,1WV2)

 3. Fault Confirmation
__________________
 A. Not applicable, the fault is evident.
 4. Fault Isolation
_______________
 A. If the fault symptom is identified by the crew observation:
 Unwanted display of CABIN READY memo

 (1) Do a check for a ground signal at the SDAC1 (1WV1) and SDAC2 (1WV2) connectors:
 - pin AA/5G

 - pin AD/5C

 (a) If there is a ground signal:

 - repair as necessary.

 (b) If there is no ground signal: 1 Replace the SDAC-1 (1WV1) (Ref. AMM TASK 31-55-34-000-001) and
　
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