1. Possible Causes
_______________
 - DET-FIRE, ENG 2 PYLON LOOP A (3WD2)

 - DET-FIRE, ENG 2 PYLON LOOP B (4WD2)

 - FDU-ENG2 (2WD2)

 - DET-FIRE, FAN LOOP A (4000WD1)

 - DET-FIRE, FAN LOOP B (4000WD2)

 - DET-FIRE, CORE LOOP A (4001WD1)

 - 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) ASM 26-12/01
 3. Fault Confirmation
__________________
 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 228
 Feb 01/04R CES

 4. Fault Isolation
_______________

 A. If the test gives the two maintenance messages CHECK ENG 2 FIRE LOOP A and CHECK ENG 2 FIRE LOOP B:
 - disconnect the connectors 2WD2-A and 2WD2-B from the engine 2 FDU (2WD2),
 - 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 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 2 PYLON LOOP A (3WD2) DET-FIRE, ENG 2 PYLON LOOP B (4WD2) and (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 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), engine 2 pylon B fire detector (4WD2), 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 2 PYLON LOOP A (3WD2) and 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 229
 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 2WD2-A and 2WD2-B to the engine 2 FDU.
　
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