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MAINTENANCE MANUAL
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CAUTION:_______DO NOT TURN THE HEX KEY MORE THAN 1/4 OF A TURN. IF YOU TURN THE HEX KEY MORE THAN 1/4 OF A TURN, DAMAGE TO THE SWITCH MAY OCCUR.
(3)
GUN 051; Turn and hold the ground test hex key 1/4 turn counterclockwise on the APU fire extinguisher bottle.
S 864-061
(4)
GUN 001-050, 052-999; Push the pressure switch manual-override button on the APU fire extinguisher bottle.
(a) Make sure these conditions occur: 1) The yellow APU BTL DISCH light on the APU/CARGO FIRE
Control Panel, P8, comes on. 2) The EICAS message, APU BTL, is shown on the top display.
S 864-062
(5)
GUN 051; Release the ground test hex key.
S 864-063
(6)
GUN 001-050, 052-999; Release the pressure switch manual-override button.
(a) Make sure that all the indications go off and stay off.
S 864-092
(7) Make sure these circuit breakers on the P6 panel are closed:
(a)
6H5, FIRE EXTINGUISHING CARGO BTL 1
(b)
6H6, FIRE EXTINGUISHING CARGO BTL 2
S 844-023
(8)
Gain access to the cargo compartment fire extinguisher bottles in the AFT cargo compartment.
S 864-093
(9)
Push and hold the pressure switch manual-override button on the number 1 cargo compartment fire extinguisher bottle.
(a) Make sure these conditions occur: 1) The yellow BTL DISCH 1 light on the APU/CARGO FIRE Control Panel, P8, comes on.
2) The EICAS message, CARGO BTL 1, is shown on the top display.
S 864-095
(10) Release the pressure switch manual-override button.
(a) Make sure that all the indications stop.
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MAINTENANCE MANUAL
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(11) Push and hold the pressure switch manual-override button on the on the number 2 cargo compartment fire extinguisher bottle.
(a) Make sure these conditions occur: 1) The yellow BTL DISCH 2 light on the APU/CARGO FIRE Control Panel, P8, comes on.
2) The EICAS message, CARGO BTL 2, is shown on the top display.
S 864-099
(12) Release the pressure switch manual-override button.
(a) Make sure that all the indications stop.
S 914-064
(13)
Do the Cargo Fire Extinguishing Armed Switch Activation Check (AMM 26-23-01).
S 914-065
(14)
Do a cargo compartment smoke test (AMM 26-16-00).
(15)
Do the APU Fire Switch Inspection Check (AMM 26-22-02).
S 914-066
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757 MAINTENANCE MANUAL
CARGO COMPARTMENT FIRE EXTINGUISHING - DESCRIPTION AND OPERATION
________________________________________________________________
1. General_______
A. The cargo compartment fire extinguishing system has controls that release one or two applications of fire extinguishing agent to a fire in either cargo compartment. The system has test capability.
B. ALL EXCEPT GUN 051; The cargo fire extinguishing system includes the following: two cargo fire extinguisher bottles, APU/CARGO fire control panel, and the squib test control panel.
C. GUN 051; The cargo fire extinguishing system includes the following: two cargo fire extinguisher bottles, APU/CARGO fire control panel, squib test control panel, two in-line pressure switches, two filter/driers and one regulator.
D. The cargo fire extinguishing system receives power from the 28 vdc hot battery bus, through a circuit breaker on main power distribution panel P6. The FIRE EXTINGUISHING CARGO BTL 1 AND BTL 2 circuit breakers on main power distribution panel P6 controls power to the system.
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