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D633W101-BEJ Jan 05/2002
LOWER CARGO FIRE EXTINGUISHING -LOWER CARGO FIRE EXTINGUISHING BOTTLE SQUIBS
Purpose You must replace the squib every 10 years. The service date is
on the squib. You can replace the squib without removing the The squib breaks a diaphragm to release the halon from the fire
fire extinguishing bottle. extinguishing bottle.
Location
The squibs are in the discharge assembly at the bottom of the fire bottles.
Physical Description
The squib is an electrically operated explosive device. It is adjacent to a bottle diaphragm that can break. The diaphragm normally seals the pressurized bottle.
Functional Description
The squib fires when you operate the discharge controls. The explosion opens the diaphragm. Nitrogen pressure inside the bottle pushes the halon through the discharge port.
Training Information Point
The electrical load management system (ELMS) does a test of the squibs during each flight leg. Look at the status messages, maintenance messages or the fire protection maintenance page to see if the squibs are serviceable. You can also use the MAT to do a test of the squibs.
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D633W101-BEJ Sep 05/2002
LOWER CARGO FIRE EXTINGUISHING -LOWER CARGO FIRE EXTINGUISHING BOTTLE SQUIBS
EFFECTIVITY BEJ ALL 26-23-00
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D633W101-BEJ Jan 05/2002
LOWER CARGO FIRE EXTINGUISHING -IN-LINE PRESSURE SWITCH
Purpose
The in-line pressure switch gives a flight deck indication when there is pressure in the discharge line downstream of a flow valve. The cargo fire discharge light comes on to show that the fire extinguishing system operates. A maintenance message also shows.
Physical Description
The in-line pressure switch has these parts:
*
Electrical connector
*
Reset button
*
Inlet fitting.
A bolt and clamp attaches the switch to the airplane structure.
Location
The forward in-line pressure switch is just forward of the forward flow valve. The aft in-line pressure switch is just aft of the aft flow valve. Access is through the lower cargo fire extinguishing bottle access panels.
Functional Description
The switch is normally open. When halon pressurizes the discharge line, the switch closes. Indicating circuits give the flight deck indications. The switch latches in the closed position.
Training Information Point
The in-line pressure switch latches closed when the fire extinguishing system operates. A maintenance message and the fire protection maintenance page show this condition. Use the reset button to set the switch contacts open.
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D633W101-BEJ Sep 05/2002
LOWER CARGO FIRE EXTINGUISHING -IN-LINE PRESSURE SWITCH
EFFECTIVITY BEJ ALL 26-23-00
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D633W101-BEJ Jan 05/2002
LOWER CARGO FIRE EXTINGUISHING -FILTER/REGULATOR
Purpose
The filter/regulator causes a slow and continuous flow of halon from the metered bottles into the cargo compartment to keep the fire out.
Physical Description
The filter regulator has these parts:
*
Inlet port
*
Outlet port
*
Filter/drier element (internal)
*
Regulator (internal).
Location
The filter regulator is near the metered bottles, behind the lining of the lower forward cargo compartment. Access is through the metered bottle access panel.
Functional Description
From the inlet port, halon goes through the filter/drier element, then through the regulator to the outlet port. The filter/drier makes sure no contamination goes to the regulator. The regulator controls the flow of halon to the discharge nozzles.
Training Information Point
The filter/regulator is internally sealed at the inlet and outlet. Pressurized halon opens the seals when the fire extinguishing system operates.
Replace the filter/regulator after the fire extinguishing system operates. The inlet and outlet are different sizes so you cannot install it incorrectly.
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D633W101-BEJ Sep 05/2002
LOWER CARGO FIRE EXTINGUISHING -FILTER/REGULATOR
EFFECTIVITY BEJ ALL 26-23-00
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D633W101-BEJ Jan 05/2002
LOWER CARGO FIRE EXTINGUISHING -FLOW VALVE
Purpose
The forward flow valve lets fire extinguishing agent from the bottles go to the forward cargo compartment. The aft flow valve lets fire extinguishing agent from the bottles go to the aft cargo compartment.
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