1. Possible Causes
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- FDU-ENG1 (2WD1)
- ENG/APU FIRE PNL (1WD)
- BOARD-ANN LT TEST & INTFC (5LP)
- wiring of the 28VDC signal from the circuit breaker 7WD1 to the engine 1 FDU
- wiring of the ground signal at the engine 1 FDU
- C/B-ENGINE/1/FIRE DET/LOOP A (7WD1)
- short to ground between the circuit breaker (7WD1) and the three units (2WD1, 1WD, 5LP)
2. Job Set-up Information
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A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 26-12-00-710-001 Operational Check of Loop/Squib
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 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 (loop/squib) (Ref. AMM TASK 26-12-00-710-001).
(a) If the circuit breaker 7WD1 is open, refer to Para. 4.C.
4. Fault Isolation
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A. Table of the circuit breakers used in this procedure:
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU ENGINE/1/FIRE DET/LOOP A 7WD1 A06
B. If the circuit breaker 7WD1 is closed, and if the FIRE legend of the ENG 1 annunciator and the DISCH legend of the ENG 1/AGENT 1 pushbutton switch on the ENG/APU FIRE panel do not come on:
- do a check for 28VDC at the pin A/A of the engine 1 FDU.
(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 7WD1 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 A/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/1/FIRE DET/LOOP A (7WD1).
C. If the circuit breaker (7WD1) is open:
- close it.
(1) If the circuit breaker trips:
- disconnect the three units below:
FDU-ENG1 (2WD1)
ENG/APU FIRE PNL (1WD)
BOARD-ANN LT TEST & INTFC (5LP)
- close the circuit breaker.
(a) If the circuit breaker stays closed:
- connect the units one by one until the circuit breaker trips
- replace the defective unit: .for LRU 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 256
Feb 01/04R CES
.for LRU 1WD: (Ref. AMM TASK 26-12-12-000-001) and (Ref. AMM
TASK 26-12-12-400-001)
.for LRU 5LP: (Ref. AMM TASK 33-14-33-000-001) and (Ref. AMM
TASK 33-14-33-400-001).
(b) If the circuit breaker trips again:
- do a check for a short to ground between the circuit breaker (7WD1) and the three units (2WD1, 1WD, 5LP) (Ref. ASM 26-12/01).
1_ If there is a short to ground:
- repair the defective wiring.
2_ If there is no short to ground:
- replace the C/B-ENGINE/1/FIRE DET/LOOP A (7WD1).
(2) Connect all the units.
D. 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 257
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