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EFFECTIVITY
GUN 001-099, 201-999 26-18-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
26-18-00-005
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FIRE PROTECTION - WING AND BODY OVERHEAT DETECTION - FUNCTIONAL DESCRIPTION
26-21-00
Page 1
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The engine fire extinguishing system puts out fires in the engine
compartment.
General Description
The engine fire extinguishing system floods the engine
compartments with halon to put out the fire. Two fire
extinguisher bottles supply the halon to either engine.
Physical Description
These are the components of the engine fire extinguishing
system:
* Engine and APU fire control panel
* Fire extinguisher bottles (2)
* Engine fire extinguishing ports.
Location
The two engine fire extinguisher bottles are in the top left corner
of the main wheel well.
The engine and APU fire control panel is in the flight
compartment on the P8 panel.
FIRE PROTECTION - ENGINE FIRE EXTINGUISHING - INTRODUCTION
EFFECTIVITY
GUN ALL 26-21-00
Page 2
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
26-21-00-001
FIRE PROTECTION - ENGINE FIRE EXTINGUISHING - INTRODUCTION
FIRE PROTECTION - ENGINE FIRE EXTINGUISHING - INTRODUCTION
EFFECTIVITY
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
26-21-00-001
Operation
When there is an overheat or fire condition, the fire handle
switch for that engine unlocks. You can also use the handle
switch override under the handle to unlock the fire handle
switch. When you pull the switch up, the engine systems are
shutdown and isolated for safety.
Engine 1 Fire Extinguishing
When you turn the engine 1 (left) fire handle switch clockwise,
the extinguisher bottle squib 1 on the R bottle operates. This
breaks a seal and sends the halon in the R bottle to engine 1. If
you turn the same engine fire handle switch counter-clockwise,
the extinguisher bottle squib 1 on the L bottle operates. This
sends the halon in the L bottle to engine 1. When an engine fire
extinguisher bottle is empty, the amber BOTTLE DISCHARGED
light on the engine and APU fire control panel comes on.
Engine 2 Fire Extinguishing
The engine 2 (right) fire extinguishing system operates the
same as engine 1. The engine 2 fire handle switch causes the
squib 2 on the L or R bottle to operate.
FIRE PROTECTION - ENGINE FIRE EXTINGUISHING - OPERATION
EFFECTIVITY
GUN ALL 26-21-00
Page 4
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
26-21-00-005
FIRE PROTECTION - ENGINE FIRE EXTINGUISHING - OPERATION
FIRE PROTECTION - ENGINE FIRE EXTINGUISHING - OPERATION
EFFECTIVITY
GUN ALL 26-21-00
Page 5
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
26-21-00-005
Purpose
The engine fire extinguisher bottles contain halon that
extinguishes an engine fire.
Physical Description
The engine fire extinguisher bottles are spherical. Each bottle
contains halon and nitrogen at a pressure of 800 psi at a
temperature of 70F (21C). These are the components of each
engine fire extinguisher bottle:
* Pressure gage and switch
* Safety relief port
* Two electrical connections
* Two discharge ports with squibs.
Each bottle has two discharge assemblies (squibs) connected
to the discharge tubing. The discharge tubing with check valves
sends the extinguisher agent to the left and right engine from
each bottle.
Location
The two engine fire extinguisher bottles are in the main wheel
well. The bottles attach to brackets in the top left corner of the
main wheel well.
Operation
When you pull up and turn the engine fire warning switch, you
operate the squib. The squib breaks a seal in the bottle. This
causes the bottle to release halon. The halon gas flows from the
bottle to the selected engine compartment. You can send halon
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