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A
757
MAINTENANCE MANUAL
C. Squib Test Panel
(1) The squib test panel is located on the P61 right side panel. The TEST switch on the panel is used to check extinguisher bottle squib cartridges. When pressed, the TEST switch on the panel checks continuity through the squib cartridges. A green test light for each squib comes on for a successful test.
D. Filters/Driers
(1) GUN 051; The filter/driers are located in the aft cargo compartment near the cargo fire extinguisher bottles. Only the discharge lines to the aft cargo compartment have filter/driers. The filter/drier filters water from the extinguishing agent to prevent the outlet nozzles from freezing. Filter/driers must be replaced after use.
E. Regulators
(1) GUN 051; The discharge line from bottle 2 to the aft cargo compartment has one regulator located near the fire extinguisher bottles, forward of the aft cargo compartment. The extinguishing agent passes through the regulator after the filter/drier. The regulator releases the extinguishant at a constant rate to the cargo compartment. Regulators must be replaced after the fire bottles are discharged.
3. Operation (Fig. 2)
_________
A. Functional Description
(1)
When a fire is detected in a cargo compartment (forward or aft), the appropriate red light (FWD or AFT) on the APU/CARGO fire control panel comes on.
(2)
The discharge circuit for the appropriate cargo compartment is armed by pressing the ARMED switch on the APU/CARGO fire control panel. A white light in the switch will come on to verify the extinguisher bottle is armed.
(3)
When the FWD ARMED switch is pressed, the following functions are accomplished:
(a)
Turns off forward cargo heat system
(b)
Turns off both left and right air conditioning recirculation fans
(c)
Opens overboard exhaust valve
(d)
Switches both air conditioning packs to high flow mode
(e)
Silences fire warning bell
(f)
Disables forward squib test function
(4)
When the AFT ARMED switch is pressed, the following functions are accomplished:
(a)
Turns off the aft cargo heat system
(b)
Turns off right air conditioning recirculation fan
(c)
Switches the right air condition packs to high flow mode
(d)
Silences the fire warning bell
(e)
Disables aft squib test function
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL
5V AC
OFF
W
LIGHTS
ARMED P
FWD CARGOHEATING
FWD CARGO
SQUIBG
L RECIRCULATINGFWD EXT DISCH1 FAN NC
LINE PRESS SWARMED
FWD CARGO 1 FWD CARGO FIRE SWITCH
G AFT CARGOAFT
SQUIB CARGO 1
BOTTLE 1MD&T
A
DISCH DISCHARGE CARGO BTL 1
P G
RELAY NC
CARGO BTL 2
CARGO 2
BOTTLE 1 DISCHARGE SWITCH
M10181 LEFT EICAS
COMPUTER (E4-2)
FWD
PRESSURE SWOFF
G
5V AC
AFT
BTL 1 CARGO 2
LIGHTS
ARMED W CARGO
CARGO BTL 112
P 6 AFT CARGOHEATING
CARGO BTL 1
SQUIB
TEST SW CARGO SQUIB R NC TEST RELAY
RIGHT EICASFAN
RECIRCULATING
COMPUTERARMED
PRESSURE SWAFT CARGO FIRE SWITCHM10401(YQM) SQUIB TEST PANEL (P61)
D44181
BOTTLE 2 2
DISCHARGEDISCH A
P
RELAY
3 FIRE EXT
MD&T
28V DCBOTTLE 1
FWD CARGO
NC
HOT BAT.
SQUIB
BUS
AFT EXT DISCH 2
FIRE EXT
BOTTLE 2 LINE PRESS SW D4420
BOTTLE 2 DISCHARGE SWITCH
1 C781
2 FIRE EXTBOTTLE 1 ENG L
3 (H5) AFT CARGO
MAIN POWER DISTRIBUTION APU/CARGO FIRE CONTROL PANEL (P8) SQUIB PANEL BTL 2CARGO
1 ALL EXCEPT 2
GUN 051
2
Cargo Compartment Fire Extinguishing Schematic
Figure 2
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