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Whenever power is first applied, an automatic system self-test occurs. All single-loop status/maintenance messages are momentarily displayed on EICAS (P2). If any loop is found faulty, then the appropriate loop message remains on EICAS display, and the system is reconfigured to the other loop. If both loops of a system are found faulty, then the FAIL P-RESET switchlight (on P8) comes on, and EICAS displays the advisory message - FIRE/OVHT SYS. Cockpit fire/overheat warnings will not be initiated by a power-up test.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL

 (4)  Manual system test:
 (a)  When the ENG/APU/CARGO switch on the fire/overheat test panel (on P8) is pressed and held, the engine, APU, and cargo detection systems go through a self-test. All loop messages are displayed on EICAS. The ECS/MSG switch is used to advance to the next EICAS page in order to display all EICAS messages. After a two to four-second delay, a successful test terminates with all fire and overheat indications displayed. The engine indications are: 1) The red LEFT and RIGHT fire switch handles light up, and
 unlock (on P8). 2) The red L and R FUEL CONTROL switches light up (on P10). 3) The red FIRE light comes on (on P1-3). 4) The amber L and R ENG OVHT lights come on (on P8). 5) EICAS displays L and R ENGINE FIRE (warnings), and L and R
 ENG OVHT (cautions). 6) The red master WARNING lights come on (on P7). 7) The fire bell sounds on the aural warning speakers.
 (b)  When the ENG/APU/CARGO switch is released, all messages and indications should clear - except for any faulty-loop messages which will remain on EICAS. The FAIL P-RESET switchlight, and EICAS advisory message - FIRE/OVHT SYS, will also remain on if there is a dual-loop fault.
 (5)  The manual system test and power-up mode will not invalidate an alarm in progress.
 C. Control
_______
 (1)  Turn-on procedure:
 (a)  
Provide electrical power (Ref 24-22-00).

 (b)  
Check that the following circuit breakers on overhead circuit breaker panel P11 are closed: 1) FIRE DETECTION L ENGINE 1 and 2 2) FIRE DETECTION R ENGINE 1 and 2 3) FIRE DET ALTN PWR ENGINE LEFT and RIGHT

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757 FAULT ISOLATION/MAINT MANUAL
ENGINE FIRE DETECTION SYSTEM
COMPONENT  FIG. 102 SHT  QTY  ACCESS/AREA  AMM REFERENCE 
CARD 1 - FIRE/OVHT LOGIC/TEST, M10224 1  1  119BL MAIN EQUIP CTR, P54  26-10-01 
CARD 2 - FIRE/OVHT LOGIC/TEST, M10274 1  1  119BL MAIN EQUIP CTR, P54  26-10-01 
CARD - LOOP 1 L ENG FIRE DET, M681  1  1  119BL MAIN EQUIP CTR, P54  26-10-01 
CARD - LOOP 2 L ENG FIRE DET, M682  1  1  119BL MAIN EQUIP CTR, P54  26-10-01 
CARD - LOOP 1 R ENG FIRE DET, M683  1  1  119BL MAIN EQUIP CTR, P54  26-10-01 
CARD - LOOP 2 R ENG FIRE DET, M684  1  1  119BL MAIN EQUIP CTR, P54  26-10-01 
CARD - LOOP 1 L NACELLE OVHT DET, M10229  1  1  119BL MAIN EQUIP CTR, P54  26-10-01 
CARD - LOOP 2 L NACELLE OVHT DET, M10276  1  1  119BL MAIN EQUIP CTR, P54  26-10-01 
CARD - LOOP 1 R NACELLE OVHT DET, M10230  1  1  119BL MAIN EQUIP CTR, P54  26-10-01 
CARD - LOOP 2 R NACELLE OVHT DET, M10275  1  1  119BL MAIN EQUIP CTR, P54  26-10-01 
CIRCUIT BREAKER - 1  FLT COMPT, P11 
FIRE DET ALIN PWR ENG L, C763  1  11J26  * 
FIRE DET ALTN PWR ENG R, C764  1  11J27  * 
FIRE DETECTION L ENG 1, C774  1  11B20  * 
FIRE DETECTION L ENG 2, C783  1  11B21  * 
FIRE DETECTION R ENG 1, C775  1  11B22  * 
COMPUTER - (FIM 31-41-00/101) EICAS R, M10182 EICAS L, M10181 FIRE DETECTION R ENG 2, C784  1  11B23  * 
　
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