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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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FIRE PROTECTION - APU FIRE EXTINGUISHING - APU FIRE EXTINGUISHING BOTTLE
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The purpose of the squib is to break the diaphragm in the bottle
and start the release of the halon gas.
Physical Description
The squib is an explosive device that operates electrically. It is
adjacent to a bottle diaphragm that can break. The diaphragm
normally seals the pressurized bottle.
Location
The squib is in the discharge assembly at the bottom of the fire
bottle.
Functional Description
Electrical power goes to the squib during the fire extinguisher
operation. An explosion of the squib opens the diaphragm.
Nitrogen pressure in the bottle pushes the halon through the
discharge port.
WARNING: MAKE SURE THERE ARE CAPS OR SHUNT PLUGS
INSTALLED ON THE SQUIBS WHEN YOU TOUCH
OR MOVE THE SQUIBS. THE SQUIB IS AN
EXPLOSIVE DEVICE AND CAN CAUSE INJURY IF
IT IS ACCIDENTALLY FIRED.
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EFFECTIVITY
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FIRE PROTECTION - APU FIRE EXTINGUISHING - APU FIRE EXTINGUISHER BOTTLE SQUIB
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
On the ground, the APU remote control panel gives you visual
and aural indications of an APU fire. The control panel also lets
you extinguish an APU fire.
Physical Description
The APU remote control panel has these components:
* Red fire warning light
* Fire horn
* Horn cutout switch
* APU fire control handle
* Bottle discharge switch.
Operation
When there is a fire in the APU, the horn and light operate
alternately and the APU stops. The horn does not operate in
flight.
When you push the horn cutout button, the horn sound stops
and the red light stays on continuously as long as APU is on fire.
When you pull the APU fire control handle, the APU system
stops and isolates from other systems.
When you pull down the APU fire control handle, you arm the
fire extinguisher toggle switch. You use the toggle switch to
discharge the APU fire extinguisher bottle to the APU
compartment.
Training Information Point
The APU fire control handle can be used to stop the APU in
emergency. The fire extinguisher bottle will not discharge.
The bottle discharge switch has a witness wire. This wire
protects against accidental operation of the discharge switch.
Broken wire shows switch movement and possible squib
operation.
FIRE PROTECTION - APU FIRE EXTINGUISHING - APU GROUND CONTROL PANEL
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Functional Description
When there is a fire condition, the APU fire handle switch on the
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