- install the engine 2 FDU (2WD2).
(b) If there is a ground signal:
- do a check and repair the wiring between the CFDIU (1TW) pin AB/12E and the engine 2 FDU (2WD2) pin B/R (Ref. ASM 26-12/02)
- install the CFDIU (1TW)
- install the engine 2 FDU (2WD1).
B. Do the test given in Para. 3.
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 106-149, 155-199, 208-299, 301-399, ∞∞26-12-00∞∞∞∞∞∞∞∞∞∞Page 290
401-499, Aug 01/05 CES
Loss of Two ENG 1 Detection Loops
1. Possible Causes
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- DET-FIRE, ENG 1 PYLON LOOP A (3WD1)
- DET-FIRE, FAN LOOP A (4000WD1)
- DET-FIRE, CORE LOOP A (4001WD1)
- wiring of Loop A I/P from the engine 1 FDU to the three loop A fire detectors
2. Job Set-up Information
______________________
A. Referenced Information
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REFERENCE DESIGNATION
-------------------------------------------------------------------------------
AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power AMM 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied
from the External Power AMM 26-12-00-200-001 Visual Inspection of the Engine Fire Detection System AMM 26-12-00-710-002 Operational Test of the Engine Fire and Overheat
Detection with the Centralized Fault Display System
(CFDS) AMM 26-12-15-000-041 Removal of the Fan Fire Detectors (4000WD1,4000WD2) AMM 26-12-15-400-041 Installation of the Fan Fire Detectors
(4000WD1,4000WD2)
AMM 26-12-16-000-001 Removal of the Pylon Fire Detectors
(3WD1,3WD2,4WD1,4WD2)
AMM 26-12-16-400-001 Installation of the Pylon Fire Detectors
(3WD1,3WD2,4WD1,4WD2) AMM 26-12-17-000-040 Removal of the Core Fire Detectors (4001WD1,4001WD2) AMM 26-12-17-400-040 Installation of the Core Fire Detectors
(4001WD1,4001WD2)
AMM 31-60-00-860-001 EIS Start Procedure
ASM 26-12/01
3. Fault Confirmation
__________________
A. Job Set-Up
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only) (Ref. AMM TASK 31-60-00-860-001).
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 106-149, 155-199, 208-299, 301-399, ∞∞26-12-00∞∞∞∞∞∞∞∞∞∞Page 291
401-499, Aug 01/05 CES
B. Test
(1) Do the operational test of the engine fire and overheat detection from the Multipurpose Control and Display Unit (MCDU) (Ref. AMM TASK 26-12-00-710-002).
4. Fault Isolation
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A. If the test gives the maintenance message ENG1 FIRE LOOP A + LOOP B:
- do a visual inspection of the three loop A fire detectors (Ref. AMM TASK 26-12-00-200-001).
(1) If one or more fire detector(s) is (are) damaged:
- replace it (them): . 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 26-12-15-000-041) and (Ref. AMM TASK 26-12-15-400-041), . for DET-FIRE, CORE LOOP A (4001WD1) (Ref. AMM TASK 26-12-17-000-040) and (Ref. AMM TASK 26-12-17-400-040).
(2) If there is no visual damage and 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.
(a) If the equivalent resistance value is not correct and is: . between 2137 ohms and 2363 ohms: there is one defective fire detector . between 4275 ohms and 4725 ohms: there are two defective fire detectors . infinite: there are three defective fire detectors or a defective wiring.
- disconnect the electrical harness from the three loop A fire detectors
- on the responder of each fire detector, make sure that the resistance value is between 4275 ohms and 4725 ohms: . between pins A/A and A/D for the engine 1 pylon loop A fire detector (3WD1) and the fan loop A fire detector (4000WD1), . between pins A/A and A/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 26-12-15-000-041) and (Ref. AMM TASK 26-12-15-400-041), . for DET-FIRE, CORE LOOP A (4001WD1) (Ref. AMM TASK 26-12-17-000-040) and (Ref. AMM TASK 26-12-17-400-040), 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(59)
