1. Possible Causes
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- FDU-ENG1 (2WD1)
- ENG/APU FIRE PNL (1WD)
- BOARD-ANN LT TEST & INTFC (18LP)
- wiring of the 28VDC signal from the circuit breaker 8WD1 to the engine 1 FDU
- wiring of the ground signal at the engine 1 FDU
- C/B-ENGINE/ENG 1/FIRE DET/LOOP B (8WD1)
- short to ground between the circuit breaker (8WD1) and the three units (2WD1, 1WD, 18LP)
2. Job Set-up Information
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A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 26-12-00-710-002 Operational Test of the Engine Fire and Overheat Detection with the Centralized Fault Display System (CFDS)
AMM 26-12-12-000-001 Removal of the ENG/APU Fire Panel (1WD)
AMM 26-12-12-400-001 Installation of the ENG/APU Fire Panel (1WD)
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) AMM 33-14-33-000-001 Removal of the Annunciator-Light Test and Interface-Board (1LP, 2LP, 3LP, 4LP, 5LP, 6LP, 7LP, R 8LP, 9LP, 10LP, 11LP, 12LP, 18LP, 19LP, 20LP) AMM 33-14-33-400-001 Installation of the Annunciator-Light Test and Interface-Board (1LP, 2LP, 3LP, 4LP, 5LP, 6LP, 7LP, R 8LP, 9LP, 10LP, 11LP, 12LP, 18LP, 19LP, 20LP) ASM 26-12/01
3. Fault Confirmation
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A. Test
(1) Do the operational test of the engine fire and overheat detection from Multipurpose Control and Display Unit (MCDU) (Ref. AMM TASK 26-12-00-710-002).
(a) If the circuit breaker 8WD1 is open, refer to Para. 4.C.
「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 258
May 01/05 CES
4. Fault Isolation
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A. Table of the circuit breakers used in this procedure:
-------------------------------------------------------------------------------
PANEL DESIGNATION IDENT. LOCATION
-------------------------------------------------------------------------------
121VU ENGINE/ENG1/FIRE DET/LOOP B 8WD1 Q38
**ON A/C 001-049, 051-099, 101-105, 151-154, 201-207,
B. If the circuit breaker 8WD1 is closed, and if the test gives the maintenance message CHECK FDU ENG 1 SUPPLY:
- do a check for 28VDC at the engine 1 FDU pin B/A.
(1) If there is 28VDC:
- replace the FDU-ENG1 (2WD1) (Ref. AMM TASK 26-12-34-000-001) and (Ref. AMM TASK 26-12-34-400-001).
(2) If there is no 28VDC:
- do a check of the wiring of the 28VDC signal from the circuit breaker 8WD1 to the engine 1 FDU (Ref. ASM 26-12/01).
(a) If there is no continuity:
- repair the above wiring.
(b) If there is continuity:
- do a check of the wiring of the ground signal at the engine 1 FDU pin B/B (Ref. ASM 26-12/01).
1 If there is no continuity:
_ - repair the above wiring.
2 If there is continuity:
_ - replace the C/B-ENGINE/ENG 1/FIRE DET/LOOP B (8WD1).
R **ON A/C 106-149, 155-199, 208-299, 301-399, 401-499,
B. If the circuit breaker 8WD1 is closed, and if the test gives the maintenance message CHECK FDU ENG 1 CHAN B SUPPLY:
- do a check for 28VDC at the engine 1 FDU pin B/A.
(1) If there is 28VDC:
- replace the FDU-ENG1 (2WD1) (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 259
Aug 01/05 CES (2) If there is no 28VDC:
- do a check of the wiring of the 28VDC signal from the circuit breaker 8WD1 to the engine 1 FDU (Ref. ASM 26-12/01).
(a) If there is no continuity:
- repair the above wiring.
(b) If there is continuity:
- do a check of the wiring of the ground signal at the engine 1 FDU pin B/B (Ref. ASM 26-12/01).
1 If there is no continuity:
_ - repair the above wiring.
2 If there is continuity:
_ - replace the C/B-ENGINE/ENG 1/FIRE DET/LOOP B (8WD1).
**ON A/C ALL
C. If the circuit breaker (8WD1) is open:
- close it.
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