Page 7 D633W101-BEJ Sep 05/2002
ENGINE FIRE EXTINGUISHING -ENGINE FIRE EXTINGUISHING BOTTLES
The fire extinguishing bottles must have a hydrostatic test every 5 years. The date of the last test is stamped on one of the mounting lugs and on an inspection tag. The tag is attached to one of the discharge assemblies.
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.
WARNING: DO NOT TOUCH THE SQUIB BEFORE YOU DO THE PROCEDURES 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.
EFFECTIVITY BEJ ALL 26-21-00
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D633W101-BEJ Sep 05/2002
ENGINE FIRE EXTINGUISHING -ENGINE FIRE EXTINGUISHING BOTTLES
EFFECTIVITY BEJ ALL 26-21-00
Page 9
D633W101-BEJ Jan 05/2002
ENGINE FIRE EXTINGUISHING -ENGINE FIRE BOTTLE SQUIB
Purpose
The squib releases the halon from the engine fire extinguishing bottle.
Location
The squib is in the discharge assembly at the bottom of the fire bottle. A fire bottle has two squibs, one for each engine.
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 put the fire switch to the DISCH 1 or DISCH 2 position. The explosion opens the diaphragm. Nitrogen pressure inside the bottle pushes the halon through the discharge port.
Training Information Point
The ELMS does an automatic squib test for these conditions:
*
When ELMS first gets power
*
At engine shutdown with the airplane on the ground.
You can also use the maintenance access terminal (MAT) to do a squib test. See the fire protection section for more information about the squib tests (SECTION 26-00).
You must replace The squib every 10 years. The service date is on one of the squib wrench flats. You can replace the squib without removing the fire extinguishing bottle.
WARNING: MAKE SURE THERE IS NO VOLTAGE AT THE ELECTRICAL CONNECTOR. IF THERE IS A VOLTAGE AT THE ELECTRICAL CONNECTOR, THE SQUIB CAN ACCIDENTALLY FIRE AND CAUSE THE FIRE EXTINGUISHING BOTTLE TO RELEASE ITS CONTENTS. ACCIDENTAL DISCHARGE OF THE FIRE EXTINGUISHING BOTTLE CAN CAUSE INJURY TO PERSONS OR 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.
CAUTION: DO NOT PUT A SHUNT PLUG ON THE SQUIB. THE SHUNT PLUG CAN CAUSE DAMAGE TO THE SQUIB PINS.
The electrical connectors and the discharge assembly interface threads are different sizes for the left and right engine squibs. This prevents incorrect connection.
EFFECTIVITY BEJ ALL 26-21-00
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D633W101-BEJ Sep 05/2002
ENGINE FIRE EXTINGUISHING -ENGINE FIRE BOTTLE SQUIB
EFFECTIVITY BEJ ALL 26-21-00
Page 11
D633W101-BEJ Jan 05/2002
ENGINE FIRE EXTINGUISHING -ENGINE FIRE PANEL
Purpose
The engine fire panel keeps the engine fire switches and engine fire bottle discharge lights together and in easy reach of the flight crew.
Location
The engine fire panel is in the flight deck on the P8 aisle stand.
Physical Description
The engine fire panel has a fire switch for each engine and a discharge light for each fire bottle.
Quick release fasteners attach the panel to the aisle stand structure. Electrical connectors connect the airplane wires to the panel.
EFFECTIVITY BEJ ALL 26-21-00
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D633W101-BEJ Sep 05/2002
ENGINE FIRE EXTINGUISHING -ENGINE FIRE PANEL
EFFECTIVITY BEJ ALL 26-21-00
Page 13
D633W101-BEJ Jan 05/2002
ENGINE FIRE EXTINGUISHING -ENGINE FIRE SWITCH
Purpose
The engine fire switch does four things:
*
Gives an indication of an engine fire
*
Stops the engine
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