R
3. Fault Confirmation
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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).
- 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
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R A. If the test gives a different maintenance message:
R - Do the trouble shooting procedure related to the maintenance message.
R
B. If the test gives the maintenance message:
CHECK FDU APU FIRE WARN CKT
and/or
CHECK FDU APU FIRE A WARN CKT
and/or
CHECK FDU APU FIRE B WARN CKT
- replace the APU fire/overheat detector (21WG) and/or the APU fire/overheat detector (22WG) (Ref. AMM TASK 26-13-15-000-001) and (Ref. AMM TASK 26-13-15-400-001).
(1) If the fault continues:
- replace the FDU-APU (13WG) (Ref. AMM TASK 26-13-34-000-001) and (Ref. AMM TASK 26-13-34-400-001).
(2) If the fault continues:
- do the operational test of the central warning system (Ref. AMM TASK 31-50-00-710-001).
R (a) If the test gives a different maintenance message: R - Do the trouble shooting procedure related to the maintenance R message. trouble R
(3) If the fault continues:
- do a check and repair the wiring between the: FDU (13WG) connector A/E and FWC (1WW1) connector AA/5C, FDU (13WG) connector A/M and FWC (1WW1) connector AA/4E, FDU (13WG) connector B/L and FWC (1WW1) connector AD/4G, FDU (13WG) connector B/E and FWC (1WW1) connector AD/5E, FDU (13WG) connector B/N and GND, FDU (13WG) connector B/B and GND, FDU (13WG) connector A/B and GND (Ref. ASM 26-13/01).
「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 205
May 01/05 CES
C. Do the test as given in the Para. 3.A.
5. Close-up
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A. Put the aircraft back to its initial configuration.
「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 206
Feb 01/05R
CES APU Power Supply to the FDU Channel A and/or B
1. Possible Causes
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- FDU-APU (13WG)
- wiring
2. Job Set-up Information
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A. Referenced Information
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REFERENCE DESIGNATION
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AMM 26-13-00-710-001 Operational Test of the APU Fire and Overheat
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本文链接地址：A320 Trouble Shooting Manual 排故手册 FIRE PROTECTION 防火(66)
