4. Fault Isolation
_______________
A. If the test gives the two maintenance messages CHECK ENG 1 FIRE LOOP A and CHECK ENG 1 FIRE LOOP B:
- disconnect the connectors 2WD1-A and 2WD1-B from the engine 1 FDU (2WD1),
- on each of these connectors, on the wiring side, make sure that the equivalent resistance value between pins J and K is between 1425 ohms and 1575 ohms.
(1) If the equivalent resistance value on the loops A and B 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.
(a) If the equivalent resistance value is not correct:
- do a visual inspection of the three loop A and B fire detectors (Ref. AMM TASK 26-12-00-200-003).
1 If one or more fire detector(s) is (are) damaged:
_
- replace it (them): . for DET-FIRE, ENG 1 PYLON LOOP A (3WD1) and DET-FIRE, ENG1 PYLON LOOP B (4WD1) (Ref. AMM TASK 26-12-16-000-001) and (Ref. AMM TASK 26-12-16-400-001), . for DET-FIRE, FAN LOOP A (4000WD1) and DET-FIRE, FAN LOOPB (4000WD2) (Ref. AMM TASK 26-12-15-000-042) and (Ref. AMM TASK 26-12-15-400-042), . for DET-FIRE, CORE LOOP A (4001WD1) and DET-FIRE, CORE LOOP B (4001WD2) (Ref. AMM TASK 26-12-17-000-041) and (Ref. AMM TASK 26-12-17-400-041).
2 If there is no visual damage:
_
- disconnect the electrical harness from each engine 1 fire detector
- on the responder of each fire detector, make sure that the resistance value is between 4275 ohms and 4725 ohms: . between pins A and D for the engine 1 pylon A fire detector (3WD1), engine 1 pylon B fire detector (4WD1), fan loop A fire detector (4000WD1) and fan loop B fire detector (4000WD2). . between pins A and C for the core loop A fire detector (4001WD1) and fan loop B fire detector (4001WD2).
a If the resistance value is not correct:
_
- replace the related fire detector: . for DET-FIRE, ENG 1 PYLON LOOP A (3WD1) and DET-FIRE, ENG 1 PYLON LOOP B (4WD1) (Ref. AMM TASK 26-12-16-000-001) and (Ref. AMM TASK 26-12-16-400-001),
「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 224
Feb 01/04R CES
. for DET-FIRE, FAN LOOP A (4000WD1) and DET-FIRE, FAN LOOP B (4000WD2) (Ref. AMM TASK 26-12-15-000-042) and (Ref. AMM TASK 26-12-15-400-042), . for DET-FIRE, CORE LOOP A (4001WD1) and DET-FIRE, CORE LOOP B (4001WD2) (Ref. AMM TASK 26-12-17-000-041) and (Ref. AMM TASK 26-12-17-400-041).
- connect the electrical connectors 2WD1-A and 2WD1-B to the engine 1 FDU.
b If the resistance value is correct:
_
- do a check and repair the wiring of the FIRE DET I/P (LOOP A) and (LOOP B) from the engine 1 FDU (2WD1) to the three loop A and B fire detectors (Ref. ASM 26-12/01).
(2) If the equivalent resistance value is correct on one loop and not on the other.
(a) For the loop with the incorrect resistance value:
- do a visual inspection of the three loop fire detectors (Ref. AMM TASK 26-12-00-200-003).
1 If one or more fire detector(s) is (are) damaged:
_
- replace it (them): . for DET-FIRE, ENG 1 PYLON LOOP A (3WD1) or DET-FIRE, ENG 1 PYLON LOOP B (4WD1) (Ref. AMM TASK 26-12-16-000-001) and (Ref. AMM TASK 26-12-16-400-001), . for DET-FIRE, FAN LOOP A (4000WD1) or DET-FIRE, FAN LOOP B (4000WD2) (Ref. AMM TASK 26-12-15-000-042) and (Ref. AMM TASK 26-12-15-400-042), . for DET-FIRE, CORE LOOP A (4001WD1) or DET-FIRE, CORE LOOP B (4001WD2) (Ref. AMM TASK 26-12-17-000-041) and (Ref. AMM TASK 26-12-17-400-041).
2 If there is no visual damage:
_
- disconnect the electrical harness from each engine 1 fire detector
- on the responder of each fire detector, make sure that the resistance value is between 4275 ohms and 4725 ohms: . between pins A and D for the engine 1 pylon A fire detector (3WD1) or engine 1 pylon B fire detector (4WD1), fan loop A fire detector (4000WD1) or fan loop B fire detector (4000WD2). . between pins A and C for the core loop A fire detector (4001WD1) or fan loop B fire detector (4001WD2).
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本文鏈接地址：A320 Trouble Shooting Manual 排故手冊(cè) FIRE PROTECTION 防火(36)
