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Metered fire extinguishing bottles
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Forward flow valve
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Forward in-line pressure switch
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Aft flow valve
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Aft in-line pressure switch
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Dump fire extinguishing bottles.
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LOWER CARGO FIRE EXTINGUISHING -COMPONENT LOCATIONS
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LOWER CARGO FIRE EXTINGUISHING -LOWER CARGO FIRE EXTINGUISHING BOTTLES -INTRODUCTION
Purpose
The lower cargo fire extinguishing bottles contain the fire extinguishing agent.
Location
The bottles are on the right side of the forward lower cargo compartment, behind the cargo compartment lining. Release the snaps then roll up the lining for access.
Physical Description
The bottles contain halon 1301 fire extinguishing agent pressurized with nitrogen. The metered bottles and dump bottles are different sizes. The metered bottles weigh approximately 84 lb (38 kg). The dump bottles weigh approximately 63 lb (28 kg). The three metered bottles are identical. The two dump bottles are identical.
The fire extinguishing bottles have these components:
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Identification plate
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Safety relief and fill port
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Handles
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Pressure switch
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Mounting brackets
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Discharge assembly
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Warning Label.
Indications
Status messages, maintenance messages, and a fire protection maintenance page show if the bottle pressure is low.
Functional Description
The discharge assembly has an explosive squib which releases the halon through the discharge port.
The pressure switch monitors the pressure inside the bottle and is normally open. When the bottle pressure decreases, the switch closes and sends a signal for indication.
The safety relief and fill port is a single fitting on the bottle. The safety relief opens to make sure the bottle does not break if internal pressure is too high.
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LOWER CARGO FIRE EXTINGUISHING -LOWER CARGO FIRE EXTINGUISHING BOTTLES -INTRODUCTION
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LOWER CARGO FIRE EXTINGUISHING -FIRE EXTINGUISHING BOTTLES -TRAINING INFORMATION POINTS
Bottle Weight
You cannot fill an empty bottle on the airplane. You must replace the bottle. Compare the weight of the new bottle with the weight on the bottle identification plate. This prevents installation of a bottle which is not full.
Removal/Installation
WARNING: BE CAREFUL WHEN YOU DISCONNECT THE HOSE ASSEMBLY FROM THE FIRE EXTINGUISHER BOTTLE. IF THE FIRE EXTINGUISHING BOTTLE DISCHARGED, THE TUBING MAY BE PRESSURIZED. WHEN YOU RELEASE THE PRESSURE IN THE TUBING YOU CAN CAUSE INJURY TO PERSONS.
WARNING: DO NOT TOUCH THE SQUIB BEFORE YOU DO THE PROCEDURE FOR DEVICES THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE. ELECTROSTATIC DISCHARGE CAN CAUSE THE FIRE BOTTLE TO RELEASE ITS CONTENTS SUDDENLY AND CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
WARNING: PUT A PROTECTIVE COVER ON THE SQUIB. IF YOU DO NOT PUT A PROTECTIVE COVER ON THE SQUIB, THE FIRE EXTINGUISHING BOTTLE CAN RELEASE ITS CONTENTS SUDDENLY AND CAUSE INJURY TO PERSONS.
WARNING: BE CAREFUL WHEN YOU MOVE THE FIRE EXTINGUISHING BOTTLE. THE FIRE EXTINGUISHING BOTTLE IS HIGHLY PRESSURIZED AND HAS AN EXPLOSIVE CARTRIDGE AS A COMPONENT. ACCIDENTAL DISCHARGE OF THE FIRE EXTINGUISHING BOTTLE CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
The discharge tubing and electrical wires are not long enough to connect to the wrong bottle. The electrical connectors for the squib and the pressure switch are different. You cannot connect the airplane wiring to the wrong device.
A platform is available to stand on while you remove and install the fire bottles.
Tests
You must remove the fire extinguishing bottle every five years for a hydrostatic test. The date of the last test is on the identification plate.
Operate the pressure switch with a hex wrench to do a test of the pressure switch and indicating circuit. If the circuit operates properly, bottle discharge indications show in the flight deck when you operate the pressure switch.
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LOWER CARGO FIRE EXTINGUISHING -FIRE EXTINGUISHING BOTTLES -TRAINING INFORMATION POINTS 中國航空網(wǎng) m.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：777 AMM 飛機(jī)維護(hù)手冊(cè) 防火 Fire Protection(33)
