26-20-00
 ALL  ú ú 01 Page 1 ú Jun 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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A
737-300/400/500MAINTENANCE MANUAL
 ENGINE FIRE EXTINGUISHING - DESCRIPTION AND OPERATION
_____________________________________________________General (Fig. 1)
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 A.  The engine fire extinguishing system has controls that release one or two applications of fire extinguishing agent to either engine.
 B.  The engine fire extinguishing system consists of two engine fire extinguisher bottles and an engine and APU fire control panel.
 C.  The engine fire extinguishing system receives power from the 28-volt dc hot battery bus through L FIRE EXT BOTTLE (2 places) and R FIRE EXT BOTTLE (2 places) circuit breakers on panel P6.
Engine Fire Extinguisher Bottle (Fig. 2)
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 A.  Engine fire extinguisher bottles are in the main landing gear wheel well. The extinguisher bottle includes two squib cartridges, a pressure switch, a pressure gauge, two discharge ports, and a filling port.
 (1)  
Two squib cartridges are on the discharge ports of each extinguisher bottle. Plumbing from each discharge port to either engine is direct. When detonated, the cartridge ruptures a retaining disc in the port releasing the extinguishing agent.

 (2)  
The pressure switch closes and activates the bottle discharge lights when the bottle is discharged or bottle pressure decreases.

 (3)  
The filling port is plugged by a stainless steel disc that acts as the primary safety relief device. The disc ruptures when bottle pressure is 2050 to 2150 psig at 70°F.

Engine and APU Fire Control Panel (Fig. 1)
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 A.  Engine fire extinguishing system components of the engine and APU fire control panel are engine 1 and 2 fire switch handles, left and right bottle discharge lights, test switch, and left and right bottle test light. The engine and APU fire control panel is on the aft electronics panel of the control stand.
 B.  Engine Fire Switches
 (1)  When an engine fire is detected, the engine fire switch handle 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 from the indicated bottle. To push the handle back in, it must be in the center position. The fire switch handle can be manually unlocked by pressing the button behind the handle.
 C.  Bottle Discharge Lights
 (1)  The bottle discharge lights are activated by the pressure switches. When the bottle discharges or bottle pressure decreases, the pressure switch closes and the bottle discharge light comes on.
 D.  Test Switch and Test Lights
 (1)  The test switch checks extinguisher bottle squib continuity. When set to 1 or 2, the test switch checks circuit continuity through the squib and the L and R test lights come on for a successful test.
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 26-21-00
 ALL  ú ú 02 Page 1 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
C296
AL FIRE EXTBOTTLE
C1021
28V DC
BHOT
L FIRE EXT
BOTTLE

BAT
BUS C297VOLT REG
2
R FIRE EXT
BOTTLE

1
C1022
R FIRE EXT
BOTTLE
S1 TEST SW CP6-2 CIRCUIT BREAKER PANEL
D
SEECCW
SHEET2
CCW
E 2 2
BILATERAL SWITCH
INTERNALS
SAME AS
ABOVE

BILATERAL SWITCHCW
CW
P8-1 ENGINE AND APU FIRE CONTROL PANEL
HANDLE

F RELEASE
HANDLE
G (FROM OVHT/
RELEASE
H FIRE DET)
(FROM OVHT/
JKLM
FIRE DET) THRUST REV
N OVERRIDE
THRUST REV OVERRIDECLOSE BLEED AIR
CLOSE BLEED AIR VALVE
VALVE

OVHT DET
OVHT DETL BOTTLER BOTTLE
BELL CUTOUT
WHEELDISCHARGEDDISCHARGED
WELL
SHUTOFF GENSHUTOFF GEN
ABA
BDISCH
FAULT
DISCHDISCH ENGINES
HYD WARN LTS

OVHT DET
NORMAL
ET
LR
HYD WARN LTS
LR
12
XEOVERHEAT
ENG 1ENG 2
APU DETOVERHEAT
　
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