(2)  
AMM 31-41-00/501, EICAS

 B.  Access
 (1)  Location Zones
 153 Aft Cargo Compartment (Left)
 154 Aft Cargo Compartment (Right)
 211/212 Flight Compartment

 C.  Prepare for Test
 S 865-001
 (1)  
Supply electrical power (AMM 24-22-00/201).

 (2)  
Make sure that EICAS operates (Ref 31-41-00).

 S 865-002
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 757 MAINTENANCE MANUAL
FIRE BOTTLE 1

GROUND
Cargo Compartment Fire Extinguishing System
Figure 501 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C99256
A

757
MAINTENANCE MANUAL

TO FORWARD TO AFT
COMPARTMENT COMPARTMENT
(YELLOW) (BLUE)
FORWARD DISCHARGE LINE PRESSURE SWITCH
FIRE FIRE EXTINGUISHER
EXTINGUISHER BOTTLE NO. 1
BOTTLE NO. 2
SEEC  SEEC
FILTER/DRIER 1
HARD POINT HARD POINT
CONNECTOR CONNECTOR
PUSHBUTTON  FILTER/DRIER
REGULATOR
OR HEX KEY 2
1
PRESSURE
1
SWITCH  THERMAL RELIEF
AFT CARGO COMPARTMENT
AND REFILL
CARRYING
HANDLES

MOUNTING
DISCHARGE DISCHARGE
BRACKETS
PORT HEAD
DISCHARGE PORT
GROUND STRAP
SEE D DISCHARGEDISCHARGE CARTRIDGESQUIB GROUND
CARGO FIRE BOTTLE
(SQUIB) LUG
C
D
IF INSTALLED
2
Cargo Compartment Fire Extinguishing System
Figure 501 (Sheet 2)

C99257
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A

757 MAINTENANCE MANUAL
 S 865-334
 (3)  Make sure these circuit breakers on the main power distribution panel, P6, are closed:
 (a)  
6H1, FIRE EXTINGUISHING ENG L BTL 1

 (b)  
6H5, FIRE EXTINGUISHING CARGO BTL 1

 (c)  
6H6, FIRE EXTINGUISHING CARGO BTL 2

 D. Do a Test of the Fire Extinguisher Bottle 1 Pressure Switch
 S 825-451
 CAUTION: IF THE HEX KEY IS ROTATED MORE THAN 1/4 TURN, DAMAGE TO THE
_______
 SWITCH MAY OCCUR.

 (1)  AIRPLANES WITH MANUAL OVERRIDE BUTTON OR HEX KEY ON THE FIRE BOTTLE; On cargo fire extinguisher bottle number 1, push and hold the pressure switch manual-override button or turn and hold the ground test hex key 1/4 turn counterclockwise.
 (a)  
Make sure the yellow DISCH light in the BTL DISCH 1 switch on the APU/CARGO Fire Control Panel, P8, comes on.

 (b)  
Make sure the EICAS message, CARGO BTL 1, shows on the top display.

 S 825-660
 (2)  AIRPLANES WITHOUT MANUAL OVERRIDE BUTTON OR HEX KEY ON THE FIRE BOTTLE; Disconnect connector D4410 from bottle number 1 and connect a jumper wire between pins 2 and 3 of D4410.
 (a)  
Make sure the yellow DISCH light in the BTL DISCH 1 switch on the APU/CARGO Fire Control Panel, P8, comes on.

 (b)  
Make sure the EICAS message, CARGO BTL 1, shows on the top display.

 S 865-006
 (3)  AIRPLANES WITH MANUAL OVERRIDE BUTTON OR HEX KEY ON THE FIRE BOTTLE; Release the pressure switch manual-override button or the ground test hex key.
 (a)  
Make sure the yellow DISCH light goes off.

 (b)  
Make sure the EICAS message, CARGO BTL 1, does not show on the top display.

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