2..................…..........................................1
 S 035-019
 (2)  
Remove the printed-circuit cards, M685 and M686, from the fire detection card file, P54. P54 is in the E/E bay, along the right side of the nose gear wheel well.

 S 865-020

 (3)  
Remove the DO-NOT-CLOSE tags and close the circuit breakers in Table 501 which were opened.

 S 755-021

 (4)  
Make sure the yellow FAIL P-RESET light (P8) is on.

 S 755-020

 (5)  
Make sure the EICAS message, FIRE/OVHT SYS, shows on the top display.

 S 865-021

 (6)  
Push the FAIL P-REST switch-light.

 (a)  Make sure the switch-light goes off.
 S 755-022
 (7)  
Make sure the EICAS message, FIRE/OVHT SYS, goes off.

 S 865-022

 (8)  
Open the circuit breakers in Table 501 and attach DO-NOT-CLOSE tags.

 S 425-089

 (9)  
Install the printed-circuit cards, M685 and M686.

 S 865-024

 (10)
 Remove the DO-NOT-CLOSE tags and close the circuit breakers in Table 501 which were opened.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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757 MAINTENANCE MANUAL
 F. Do a Test of the Remote APU Fire Warning Horn Interrupt
 S 865-025
 (1)  
Push and hold the ENG/APU/CARGO switch (on P8).

 S 865-026

 (2)  
Make sure the red APU FIRE light, on P62, comes on.

 S 865-027

 (3)  
Make sure the APU fire warning horn is heard.

 S 865-028
 CAUTION: DO NOT USE THE APU SHUTDOWN SWITCH ON THE NOSE GEAR PANEL TO
_______ STOP THE OPERATION OF THE APU. THIS ARMS THE FIRE BOTTLE AND THE APU WILL NOT GO THROUGH A COOLING CYCLE WHICH CAN CAUSE DAMAGE TO THE APU.
 (4)  Push the APU FIRE SHUTDOWN switch, on P62, and make sure these indications occur:
 (a)  
The APU fire warning horn stops.

 (b)  
The red APU FIRE light stays on.

 S 865-029
 (5)  
Open and then close the APU REMOTE FIRE IND circuit breaker on the P11 panel.

 S 755-030

 (6)  
Make sure the APU fire warning horn is heard.

 S 865-031

 (7)  
Release the ENG/APU/CARGO switch and make sure these indications occur:

 (a)  
The APU FIRE light goes off.

 (b)  
The APU fire warning horn stops.

 G. Do a Test of the APU Automatic Fire Shutdown
 S 715-032
 (1)  With the airplane on the ground and the two engines off, an APU fire will cause an automatic shutdown of the APU. The contents of the APU fire bottle will then be released. This is a test of the automatic shutdown function.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01 Page 505 ú Sep 20/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL

 S 865-034
 WARNING: FAILURE TO OPEN THE CIRCUIT BREAKER ON THE P6 PANEL WILL CAUSE
_______ THE CONTENTS OF THE APU FIRE BOTTLE TO BE RELEASED. THIS CAN CAUSE INJURY TO PERSONS.
 (2)  Open these circuit breakers on the P6 panel and attach DO-NOT-CLOSE tags:
 (a)  6G1, FIRE EXT APU
 S 865-035
 (3)  Open these circuit breakers on the P11 panel and attach DO-NOT-CLOSE tags:
 (a)  
11B24, FIRE DETECTION APU 1

 (b)  
11B25, FIRE DETECTION APU 2

 (c)  
11J25, FIRE DET ALTN PWR APU

 S 035-036
 (4)  At the left miscellaneous electrical equipment panel, P36, in the main equipment center, do these steps:
　
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