- do a check and repair the wiring of the FIRE DET I/P (LOOP A) from the engine 2 FDU (2WD2) to the three loop A fire detectors (Ref. ASM 26-12/01).
 (l) If the equivalent resistance value is correct:
 - replace the FDU-ENG2 (2WD2) (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 216
 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 2 pylon loop A fire detector (3WD2) 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 2 PYLON LOOP A (3WD2) (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 2WD2-A to the engine 2 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 2 FDU (2WD2) 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 217
 Aug 01/04R
 CES  Loss of the Detection by the Engine 2 Loop B

 1. Possible Causes
_______________
 - DET-FIRE, ENG 2 PYLON LOOP B (4WD2)

 - FDU-ENG2 (2WD2)

 - 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
 AMM 26-12-00-710-002  Operational Test of the Engine Fire and Overheat Detection with the Centralized Fault Display System (CFDS)
 AMM 26-12-15-000-042 Removal of the Fan Fire Detectors (4000WD1,4000WD2) AMM 26-12-15-400-042 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 26-12-17-000-041 Removal of the Core Fire Detectors (4001WD1,4001WD2) AMM 26-12-17-400-041 Installation of the Core Fire Detectors
 (4001WD1,4001WD2) AMM 26-12-34-000-001 Removal of the Engine Fire-Detection Unit (FDU) (2WD1,2WD2) AMM 26-12-34-400-001 Installation of the Engine Fire-Detection Unit (FDU) (2WD1,2WD2) R AMM 78-36-51-400-040 Installation of the Cowl Opening Actuator ASM 26-12/01
 3. Fault Confirmation
__________________
 NOTE : Some FIRE LOOP FAULT ECAM warnings occur in flight but do not occur
____ on the ground during tests. For such warnings, refer to SIL 26-029 for trouble shooting recommendations.
 A. 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).
 「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 218
 Aug 01/04 CES

 4. Fault Isolation
_______________

 A. If the test gives the maintenance message CHECK ENG 2 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 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 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).
　
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