4. Fault Isolation
_______________
A. If the test gives the maintenance message CHECK ENG 1 FIRE LOOP B:
- do a visual inspection of the three loop 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 B (4WD1) (Ref. AMM TASK 26-12-16-000-001) and (Ref. AMM TASK 26-12-16-400-001) . for 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 B (4001WD2) (Ref. AMM TASK 26-12-17-000-041) and (Ref. AMM TASK 26-12-17-400-041).
R (2) If there is no visual damage, do a visual inspection of the engine 1
R near the three fire detectors.
R Make sure that:
R (a) There is no fuel or hydraulic leakage.
R (b) There is no air leakage at the connections of the bleed air duct.
R (c) The electrical cables are correctly connected.
R (d) The bend in the flex hose is outboard and away from the engine
R (Ref. AMM TASK 78-36-51-400-040).
R (3) If there is no visual damage, do a visual inspection for retention or
R worn contact of each pin of the terminal block 450VT1. If necessary,
R replace the terminal block.
R (4) If there is no visual damage, swap the pins that follow:
- the pins B and C of the terminal block 450VT1 section 1
- with the pins C and A of the terminal block 450VT1 section 2.
(a) If the test gives the maintenance message CHECK ENG 1 FIRE LOOP A or the maintenance message CHECK ENG 1 FIRE LOOP B again:
- swap back the pins B and C of the terminal block 450VT1 section 1
- with the pins C and A of the terminal block 450VT1 section 2.
- do a check and if necessary, repair the wiring from the terminal block 450VT1 to the Fire Detection Unit (2WD1).
1 If the wiring is correct and if the fault continues, swap the
_
pins that follow:
- the pins of the terminal block 450VT1 section 1 of the engine 1 pylon loop A fire detector (3WD1)
- with the pins of the terminal block 450VT1 section 2 of the engine 1 pylon loop B fire detector (4WD1).
「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 209
Aug 01/04 CES (b) If the test gives the maintenance message CHECK ENG 1 FIRE LOOP
A:
- swap back the pins of the fire detector (3WD1) with the pins of the fire detector (4WD1).
- do a check and if necessary, repair the wiring from the terminal block 450VT1 he section 2 to the fire detector (4WD1) (Ref. ASM 26-12/01).
1 If the wiring is correct and if the fault continues:
_
- replace the 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).
(c) If the test gives the maintenance message CHECK ENG 1 FIRE LOOP B again:
- swap back the pins of the fire detector (3WD1) with the pins of the fire detector (4WD1).
(d) If the fault continues, swap the pins that follow:
- the pins of the terminal block 450VT1 section 1 of the core loop A fire detector (4001WD1) 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(29)
