- do a check and repair the wiring of the FIRE DET I/P (LOOP A) and (LOOP B) from the engine 2 FDU (2WD2) 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 2 PYLON LOOP A (3WD2) or DET-FIRE, ENG 2 PYLON LOOP B (4WD2) (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 2 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 2 pylon A fire detector (3WD2) or engine 2 pylon B fire detector (4WD2), 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) and fan loop B fire detector (4001WD2).
a If the resistance value is not correct:
_
- replace the related fire detector: . for DET-FIRE, ENG 2 PYLON LOOP A (3WD2) or DET-FIRE, ENG 2 PYLON LOOP B (4WD2) (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 230
Feb 01/04R CES
. 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).
- connect the electrical connector to the engine 2 FDU.
b If the resistance value is correct:
_
- do a check and repair the wiring of the FIRE DET I/P from the engine 2 FDU (2WD2) to the three loop fire detectors (Ref. ASM 26-12/01).
(b) For the loop with the correct resistance:
- disconnect the electrical harness from the three fire detectors
- on the responder of each detector, make sure that the insulation resistance value is higher than 20 Megohms: . between pins A and the responder metal casing and between pin D and the responder metal casing for the engine 2 pylon A fire detector (3WD2) or engine 2 pylon B fire detector (4WD2), fan loop A fire detector (4000WD1) or fan loop B fire detector (4000WD2). . 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) or fan loop B fire detector (4001WD2).
1 If the insulation resistance value is not correct:
_
- replace the related fire detector: . for DET-FIRE, ENG 2 PYLON LOOP A (3WD2) or DET-FIRE, ENG 2 PYLON LOOP B (4WD2) (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 the insulation resistance value is correct:
_
- do a check and repair the wiring of the FIRE DET I/P from the engine 2 FDU (2WD2) to the three loop fire detectors (Ref. ASM 26-12/01).
(3) If the equivalent resistance values are correct on the loop A and B:
- replace the FDU-ENG2 (2WD2) (Ref. AMM TASK 26-12-34-000-001) and (Ref. AMM TASK 26-12-34-400-001).
(a) If the fault continues:
- disconnect the electrical harness from the three loop A and B fire detectors
- on the responder of each detector, make sure that the insulation resistance value is higher than 20 Megohms:
「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 231
Feb 01/04R CES
. between pins A and the responder metal casing and between pin D and the responder metal casing for the engine 2 pylon A fire detector (3WD2), engine 2 pylon B fire detector (4WD2), fan loop A fire detector (4000WD1) and fan loop B fire detector (4000WD2). . 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) and fan loop B fire detector (4001WD2). 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 FIRE PROTECTION 防火(39)
