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from either one or both bottles to the same engine.
If the bottle temperature increases to 266F (130C), the safety
relief port ruptures. This releases halon into the wheel well.
Training Information Point
The discharge tubing fittings from the two fire extinguisher
bottles are different size. Also the tubing has colored tape,
yellow for engine 1 and blue for engine 2.
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.
FIRE PROTECTION - ENGINE FIRE EXTINGUISHING - EXTINGUISHER BOTTLE
EFFECTIVITY
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Purpose
The purpose of the squib is to break the diaphragm seal and
start the release of the halon gas from the bottle.
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 squibs are in the discharge assembly at the bottom of the
extinguisher bottles.
Functional Description
A squib operates when you turn a fire warning switch. The
explosion breaks open the diaphragm. The 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.
FIRE PROTECTION - ENGINE FIRE EXTINGUISHING - EXTINGUISHER BOTTLE SQUIB
EFFECTIVITY
GUN ALL 26-21-00
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FIRE PROTECTION - ENGINE FIRE EXTINGUISHING - EXTINGUISHER BOTTLE SQUIB
FIRE PROTECTION - ENGINE FIRE EXTINGUISHING - EXTINGUISHER BOTTLE SQUIB
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The engine and APU fire control panel monitors the fire
protection system for these conditions:
* Engine overheat
* Engine fire
* APU fire
* Wheel well fire
* L bottle discharge
* R bottle discharge
* APU bottle discharge
* Engine fire protection fault
* APU fire protection fault.
The engine and APU fire control panel lets you do these
functions:
* Set the mode of operation (single or dual loop operation)
* Operation of the fire extinguisher bottles
* Do a test of the fire extinguisher bottle squibs
* Do a test of the fire protection system
* Do a test of the fault detection circuits
* Stop the fire alarm bell.
Physical Description
These are the components of the engine and APU fire control
panel:
* Engine and APU fire handle switches
* OVHT DET switches
* FAULT/INOP test switch
* OVHT/FIRE test switch
* EXT TEST switch
* Bell CUTOUT switch.
Location
The engine and APU fire control panel is on the P8 panel.
Operation Indications
These are the indications on the engine and APU fire control
panel:
* WHEEL WELL fire warning light, comes on for a wheel well
fire condition
* ENG OVERHEAT light comes on for an engine overheat
condition
* Fire handle switch lights come on for an engine fire condition
* Bottle discharge lights come on when an extinguisher bottle
is discharged
* FAULT light comes on to show a fault condition in the engine
fire detection system
* APU DET INOP light comes on to show a fault condition in the
APU fire detection system
　
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