- wiring

 2. Job Set-up Information
______________________
 A. Referenced Information

 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 26-13-00-710-001 Operational Test of the APU Fire and Overheat
 Detection System AMM 26-13-15-710-051 AMM 26-13-34-000-001 Removal of the APU Fire-Detection Unit (FDU) (13WG) AMM 26-13-34-400-001 Installation of the APU Fire-Detection Unit (FDU)
 (13WG) ASM 26-13/01 R AWM 31-52-18
 3. Fault Confirmation
__________________
 A. The APU FIRE DETECTION UNIT 13WG (p/n 3720-00-00) gives unwanted "CHECK FDU APU LOOP A WARN CKT" and/or "CHECK FDU APU LOOP B WARN CKT" warning(s).
 - The warnings do not relate to a failure of the loops A or B.

 - The messages show during aircraft electrical power up at the power up test or the CFDIU test.

 - The FDU gives the messages during each flight until the aircraft

 operation is fully stopped. Airbus supplies a new FDU that corrects R this fault. For more information refer TFU 26.13.00.001.
 (1) To prevent the FDU to give messages on power up:
 (a) When the Electric Ground Supply energizes the aircraft:

 - Do not operate switches in this order: MAINT BUS -> "ON", BAT 1+2 -> "ON" and EXT PWR -> "ON"

 - Operate switches in this order: MAINT BUS -> "ON", EXT PWR -> "ON" and BAT 1+2 -> "ON".

 (b) When the APU energizes the aircraft:

 - Do the 'Operational Test of the APU Fire and Overheat Detection with the CFDS' after the APU starts (Ref. AMM TASK 26-13-15-710-051).
 「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 : ALL ∞∞26-13-00∞∞∞∞∞∞∞∞∞∞Page 213
 May 01/05 CES

 - If FWC and FDU are connected and all other systems operate satisfactorily, the unwanted message(s) clear(s). No maintenance work is necessary.

 - If FWC and FDU are not connected or another system has a failure, the message stays. Maintenance work is necessary.

 B. Do the operational test of the APU fire and overheat detection system (Ref. AMM TASK 26-13-00-710-001).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance message CHECK FDU APU LOOP B WARN CKT:
 - replace the FDU-APU (13WG) (Ref. AMM TASK 26-13-34-000-001) and (Ref. AMM TASK 26-13-34-400-001).
 (1) If the fault continues:
 - do a check and repair of the wiring between
 FDU 13WG-B/L and the first terminal block
 (Ref. ASM 26-13/01) and (Ref. AWM 31-52-18).

 B. Do the test as given in the Para. 3.A.
 「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 : ALL ∞∞26-13-00∞∞∞∞∞∞∞∞∞∞Page 214
 May 01/05R
 CES  Loss of the columns 1 and 3 of the legend of the APU FIRE Pushbutton-Switch

 1. Possible Causes
_______________
 - BOARD-ANN LT TEST & INTFC (5LP)

 - ENG/APU FIRE PNL (1WD)

 - aircraft wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 26-12-12-000-001 Removal of the ENG/APU Fire Panel (1WD)
 AMM 26-12-12-400-001 Installation of the ENG/APU Fire Panel (1WD)
 AMM 26-13-00-710-001 Operational Test of the APU Fire and Overheat

 Detection System AMM 33-14-33-000-001 Removal of the Annunciator-Light Test and Interface-Board (1LP, 2LP, 3LP, 4LP, 5LP, 6LP, 7LP, R 8LP, 9LP, 10LP, 11LP, 12LP, 18LP, 19LP, 20LP) AMM 33-14-33-400-001 Installation of the Annunciator-Light Test and Interface-Board (1LP, 2LP, 3LP, 4LP, 5LP, 6LP, 7LP,
R 8LP, 9LP, 10LP, 11LP, 12LP, 18LP, 19LP, 20LP) ASM 26-13/01 ASM 33-14/10
 3. Fault Confirmation
__________________
 A. Do the operational test of the APU Fire and Overheat Detection System (Ref. AMM TASK 26-13-00-710-001).
 4. Fault Isolation
_______________
 A. If the columns 1 and 3 of the legend of the APU FIRE pushbutton-switch do not come on during the test: - on overhead panel 25VU, set the ANN LT switch to TEST and do a check if
 the columns 1 and 3 of the legend of the APU FIRE pushbutton-switch come on
　
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