ENGINE FIRE EXTINGUISHING - FAULT ISOLATION PROCEDURES
______________________________________________________
 TASK 26-21-00-810-801
 The SQUIB Legend of the ENG 1/AGENT 1 Pushbutton Switch does not Come on
 1. Possible Causes_______________
 - ENG/APU FIRE PNL (1WD) - CARTRIDGE-ENG1 FIRE EXTING BOTTLE 1 (5WE1) - lamp of the SQUIB legend of the ENG 1/AGENT 1 pushbutton switch - ENG 1/AGENT 1 pushbutton switch - wiring from the engine 1 fire extinguishing bottle 1 cartridge (5WE1) to the ENG/APU FIRE panel (1WD) - wiring from the circuit breaker 1WE1 to the ENG/APU FIRE panel (1WD) - wiring from the circuit breaker 2WE1 to the ENG/APU FIRE panel (1WD)
 2. Job Set-up Information______________________ 
R  A. Fixtures, Tools, Test and Support Equipment 
R R R  -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
R  No specific  MULTIMETER - FLUKE 75 
R  B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------

ESPM 20-45-11 
R  AMM 26-12-00-710-001 AMM 26-12-12-000-001 AMM 26-12-12-400-001 AMM 26-21-41-000-004 AMM 26-21-41-400-004 ASM 26-21/01 Operational Check of Loop/SquibRemoval of the ENG/APU Fire Panel (1WD)Installation of the ENG/APU Fire Panel (1WD)Removal of the Cartridge of the Engine Fire-Extinguisher BottleInstallation of the Cartridge of the Engine Fire-Extinguisher Bottle
 3. Fault Confirmation__________________

 A. Make sure that this(these) circuit breaker(s) is(are) closed:
 -------------------------------------------------------------------------------
PANEL DESIGNATION IDENT. LOCATION
 -------------------------------------------------------------------------------
122VU LIGHTING/TST/BOARD/SPLY 30LP X06
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 B. Test

 (1) Do the operational test of the engine fire and overheat detection (loop/squib) (Ref. AMM TASK 26-12-00-710-001).
 4. Fault Isolation
_______________
 A. If the SQUIB legend of the ENG 1/AGENT 1 pushbutton switch does not come on during the fire test: - on the panel 25VU, set the ANN LT switch to TEST and do a check to see
 if the SQUIB legend of the ENG 1/AGENT 1 pushbutton switch comes on.
 (1) If the SQUIB legend does not come on:

 (a) Replace the lamp of the SQUIB legend of the ENG 1/AGENT 1 pushbutton switch.

 - If the fault continues: replace the ENG 1/AGENT 1 pushbutton switch.

 (b) Or replace the ENG 1/AGENT 1 pushbutton switch that has LEDs (Ref. ESPM 20-45-11).

 (2) If the SQUIB legend comes on:

 - replace the ENG/APU FIRE PNL (1WD) (Ref. AMM TASK 26-12-12-000-001) and (Ref. AMM TASK 26-12-12-400-001).
 (a) If the fault continues:

 - replace the CARTRIDGE-ENG1 FIRE EXTING BOTTLE 1 (5WE1) (Ref. AMM TASK 26-21-41-000-004) and (Ref. AMM TASK 26-21-41-400-004).

 (b) If the fault continues:

R CAUTION : WHEN YOU DO THE TESTS OF A SQUIB, USE A MULTIMETER THAT
_______ R KEEPS THE TEST CURRENT AT 0.040 AMPS MAXIMUM AT EACH R POSITION OF THE SELECTOR SWITCH. TOO MUCH AMPERAGE WILL R FIRE THE SQUIB AND CAUSE DISCHARGE OF THE RELATED FIRE R EXTINGUISHING BOTTLE.
R CAUTION : WHEN YOU DO THIS TEST, MAKE SURE THAT THE SQUIB IS
_______ R INSTALLED IN THE FIRE EXTINGUISHING BOTTLE. IF THE R SQUIB IS REMOVED FROM THE BOTTLE, YOU MUST NOT DO THIS R TEST BUT ONLY THE TESTS GIVEN IN THE CMM.
 - do a check of the wiring from the engine 1 fire extinguishing bottle 1 cartridge (5WE1) to the ENG/APU FIRE panel (1WD) (Ref. ASM 26-21/01).
R NOTE : You can measure the resistance of the squib with a
____ R MULTIMETER - FLUKE 75 or equivalent. Make sure that each R internal squib bridgewire resistance is 1 +/- 0.1 ohm.
 「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 ∞∞26-21-00∞∞∞∞∞∞∞∞∞∞Page 202
 May 01/04 CES 1 If there is no continuity:

_

 - repair the above wiring.
 2 If there is continuity:

_

 - do a check of the wiring from the circuit breaker 1WE1 to the ENG/APU FIRE panel (1WD) pin A/F (Ref. ASM 26-21/01).
 a If there is no continuity:
　
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