- do a check and if necessary, repair the wiring from the terminal block 450VT1 section 1 to the fire detector (4000WD1) (Ref. ASM 26-12/01).
1 If the wiring is correct and if the fault continues:
_
- replace the DET-FIRE, FAN LOOP A (4000WD1) (Ref. AMM TASK 26-12-15-000-042) and (Ref. AMM TASK 26-12-15-400-042).
(i) If the test gives the maintenance message CHECK ENG 1 FIRE LOOP A again:
- swap back the pins of the fire detector (4000WD1) with the pins of the fire detector (4000WD2).
(j) If the fault continues:
- disconnect the connector 2WD1-A from the engine 1 FDU (2WD1)
- on the connector, on the wiring side, make sure that the equivalent resistance value between pins J and K is between 1425 ohms and 1575 ohms.
(k) If the equivalent resistance value is not correct and is: between 2137 ohms and 2363 ohms: there is one defective detector between 4275 ohms and 4725 ohms: there are two defective detectors infinite: there is either three defective detectors or a defective wiring.
- disconnect the electrical harness from the three loop A fire detectors
- on the responder of each detector, make sure that the resistance value is between 4275 ohms and 4725 ohms: . between pins A and D for the engine 1 pylon loop A fire detector (3WD1) and the fan loop A fire detector (4000WD1), . between pins A and C for the core loop A fire detector (4001WD1).
1 If the resistance value is not correct:
_
- replace the related fire detector: . for DET-FIRE, ENG 1 PYLON LOOP A (3WD1) (Ref. AMM TASK 26-12-16-000-001) and (Ref. AMM TASK 26-12-16-400-001) . for DET-FIRE, FAN LOOP A (4000WD1) (Ref. AMM TASK 26-12-15-000-042) and (Ref. AMM TASK 26-12-15-400-042) . for DET-FIRE, CORE LOOP A (4001WD1) (Ref. AMM TASK 26-12-17-000-041) and (Ref. AMM TASK 26-12-17-400-041).
- connect the electrical connector 2WD1-A to the engine 1 FDU.
2 If the resistance value is correct:
_
- do a check and repair the wiring of the FIRE DET I/P (LOOP A) from the engine 1 FDU (2WD1) to the three loop A fire detectors (Ref. ASM 26-12/01).
(l) If the equivalent resistance value is correct:
- replace the FDU-ENG1 (2WD1) (Ref. AMM TASK 26-12-34-000-001) and (Ref. AMM TASK 26-12-34-400-001).
「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 ∞∞26-12-00∞∞∞∞∞∞∞∞∞∞Page 206
Aug 01/04R CES
1 If the fault continues:
_
- disconnect the electrical harness from the three loop A fire detectors
- on the responder of each detector, make sure that the insulation resistance value is higher than 20 Megohms: . between pin A and the responder metal casing and between pin D and the responder metal casing for the engine 1 pylon loop A fire detector (3WD1) and the fan loop A fire detector (4000WD1). . between pin A and the responder metal casing and between pin C and the responder metal casing for the core loop A fire detector (4001WD1).
a If the insulation resistance value is not correct:
_
- replace the related fire detector: . for DET-FIRE, ENG 1 PYLON LOOP A (3WD1) (Ref. AMM TASK 26-12-16-000-001) and (Ref. AMM TASK 26-12-16-400-001) . for DET-FIRE, FAN LOOP A (4000WD1) (Ref. AMM TASK 26-12-15-000-042) and (Ref. AMM TASK 26-12-15-400-042) . for DET-FIRE, CORE LOOP A (4001WD1) (Ref. AMM TASK 26-12-17-000-041) and (Ref. AMM TASK 26-12-17-400-041).
- connect the electrical connector 2WD1-A to the engine 1 FDU.
b If the insulation resistance value is correct:
_
- do a check and repair the wiring of the FIRE DET I/P (LOOP A) from the engine 1 FDU (2WD1) to the three loop A fire detectors (Ref. ASM 26-12/01).
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 : ALL ∞∞26-12-00∞∞∞∞∞∞∞∞∞∞Page 207
Aug 01/04R
CES Loss of the Detection by the Engine 1 Loop B
1. Possible Causes
_______________
- DET-FIRE, ENG 1 PYLON LOOP B (4WD1)
- FDU-ENG1 (2WD1)
- DET-FIRE, FAN LOOP B (4000WD2)
- DET-FIRE, CORE LOOP B (4001WD2)
- wiring
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 26-12-00-200-003 Visual Inspection of the Engine Fire Detection System
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本文链接地址：A320 Trouble Shooting Manual 排故手册 FIRE PROTECTION 防火(28)
