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AFT CARGO FWD TEST
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SQUIB TEST CONTROL PANEL
B APU SHUTDOWN REMOTE CONTROL PANEL, P62
1
GUN 051
C
APU Fire Extinguishing System Component Location
Figure 1 (Sheet 1)
D02976
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ALL ú ú 10 Page 2 ú Dec 20/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
SEE D
HEX KEY FOR PRESSURE SWITCH
GROUND TEST
(TURN CW FOR SAFETY RELIEF
SIMULATED AND FILLER PORT
BTL DISCH)
MOUNTING
LUGS (4)
ELECTRICAL
CONNECTOR
WITH SHUNT
CAP ON UNUSED DISCHARGE ELECTRICAL
DISCHARGE PORT CONNECTOR
ASSEMBLY
APU FIRE EXTINGUISHER BOTTLE
D
APU Fire Extinguisher System Component Location
Figure 1 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
SEE D
PRESSURE SWITCH
SAFETY RELIEF
GROUND TEST
AND FILLER PORT PUSHBUTTON
MOUNTING LUGS (4)
ELECTRICAL
CONNECTOR
WITH SHUNT
CAP ON UNUSED DISCHARGE ELECTRICAL
DISCHARGE PORT CONNECTOR
ASSEMBLY
APU FIRE EXTINGUISHER BOTTLE D APU Fire Extinguisher System Component Location Figure 1 (Sheet 3)
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A
757
MAINTENANCE MANUAL
(4)
ON ALL EXCEPT GUN 051; The pressure switch detects a decrease in bottle pressure and activates the bottle discharge lights. The pressure switch can be tested using the ground test pushbutton.
(5)
The safety relief is a thermal expansion overpressure 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 and pressurizing gas into the bottle.
(6)
The extinguishing agent is bromotrifluoromethane (halon), and the pressurizing gas dry nitrogen. The agent leaves no residue when discharged.
B. APU Fire Switch
(1) The APU fire switch is located on the APU fire control panel at pilot's aft control stand P8. When a fire is detected in the APU compartment, the APU fire switch handle red warning light comes on. A solenoid energizes releasing a mechanical interlock on the fire switch handle shaft. When the mechanical interlock is released, the fire switch handle can be operated by pulling the handle out and rotating it. Rotating the handle releases the extinguishing agent. After rotation, the fire handle automatically returns to an off-center position. To push the handle back in it must be in the center horizontal position. The fire switch handle can be manually unlocked by pressing the button behind the handle.
C. APU Shutdown Remote Control Panel
(1) The APU shutdown remote control panel P62 is located on the nose landing gear. P62 contains a red APU FIRE LIGHT, APU SHT DN/C. O. SWITCH, and APU BTL DISCH SWITCH. When a fire is detected in the APU compartment, the APU FIRE LIGHT comes on, and a warning horn sounds. Pressing APU SHT DN/CO switch shuts down the APU and arms the remote APU bottle discharge. Pressing APU BTL DISCH SWTICH, discharges the APU fire bottle. If APU SHT DN/C. O. SWITCH is pressed, the APU remote fire indication power must be recycled OFF and ON to reset the system, otherwise fire horn is disabled.
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