(2)
Two squib cartridges are on the discharge valves of each extinguisher bottle. When detonated, the cartridge ruptures a retaining disc in the valve releasing the extinguishing agent.
(3)
The pressure switch detects a decrease in bottle pressure and activates the bottle discharge lights. The pressure switch can be manually tested by the push of the button or the turn of the hex key located on the switch.
(4)
The safety relief valve is a thermal expansion over-pressure rupture disc. If bottle pressure is too high, the safety relief ruptures, allowing the bottle to discharge. The filler port is for introducing the extinguishing agent an pressurizing gas into the bottle.
(5)
The extinguishing agent is bromotrifluoromethane (halon), and the pressurising gas dry nitrogen. The agent leaves no residue when discharged.
B. APU/CARGO Fire Control Panel
(1) The FWD/AFT ARMED and BTL 1/2 DISCH switches are located on the APU/CARGO fire control panel at pilots' aft control stand P8. When a cargo compartment fire is detected, the red FWD or AFT warning light comes on. The ARMED switch on the panel, when pressed, arms the extinguisher bottle for discharge to the compartment desired. When the bottle is armed, a white (ARMED) light appears on the switch. To discharge the extinguishing agent, press the BTL DISCH 1 or 2 switch. Cargo bottle 1 or 2 will be discharged depending on the switch selected. The amber DISCH light comes on when the bottle discharges.
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MAINTENANCE MANUAL
APU/CARGO FIRE CONTROL PANEL
Cargo Compartment Fire Extinguishing System - Component Location
Figure 1 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL
AFT CARGO COMPARTMENT
Cargo Compartment Fire Extinguishing System - Component Location
Figure 1 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
E65980
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MAINTENANCE MANUAL
TO FORWARD
TO AFT COMPARTMENT
COMPARTMENT (YELLOW)
(BLUE)FORWARD DISCHARGE LINE PRESSURE SWITCH
CARGO FIRE CARGO FIRE
EXTINGUISHER
EXTINGUISHER BOTTLE NO. 1
BOTTLE NO. 2
SEEC SEEC
FILTER/DRIER
1
HARD POINT
CONNECTOR
HARD POINT CONNECTOR
1 GUN 051 FILTER/DRIER2 IF INSTALLED REGULATOR
1 1
CARGO COMPARTMENT BOTTLES
F
PUSHBUTTON OR
HEX KEY
DISCHARGE
PRESSURE PORT
SWITCH
1
DISCHARGE THERMAL RELIEF
HEAD
AND REFILL GROUND STRAP
CARRYING
HANDLES
DISCHARGE CARTRIDGE GROUND(SQUIB) LUG
D
MOUNTING
BRACKETS NOZZLE
SEAL
DISCHARGE NOZZLE
PORT SUPPORT
SEE D
DISCHARGE
SQUIB
FIRE EXTINGUISHER DISTRIBUTION NOZZLECARGO FIRE EXTINGUISHER BOTTLE
EC
Cargo Compartment Fire Extinguishing System - Component Location
Figure 1 (Sheet 3)
C99258
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