LOWER CARGO FIRE EXTINGUISHING -FUNCTIONAL DESCRIPTION -METERED BOTTLES CIRCUIT
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LOWER CARGO FIRE EXTINGUISHING -OPERATION -CONTROLS
Cargo Smoke Indication
If there is smoke in a lower cargo compartment, these indications occur in the flight deck:
*
The master warning lights come on
*
The fire warning aural operates
*
A cargo fire warning message shows
*
The cargo fire warning light comes on.
The master warning lights and fire warning aural are prevented from operating during part of the takeoff.
Operation
Push the lighted cargo fire arm switch to arm the system. Push the cargo fire discharge switch and hold it for one second. Make sure the cargo fire discharge light comes on.
Training Information Point
The two dump bottles fire as soon as you push the cargo fire discharge switch. With the airplane on the ground, twenty minutes later bottle 2A fires and starts a metered discharge.
The lower cargo fire extinguishing system uses the hot battery bus. You can discharge the lower cargo fire bottle with the battery switch off and without ground power on the airplane.
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LOWER CARGO FIRE EXTINGUISHING -OPERATION -CONTROLS
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LOWER CARGO FIRE EXTINGUISHING -OPERATION -INDICATIONS
Fire Protection Maintenance Page
Operational status of the lower cargo fire extinguishing system is shown on the fire protection maintenance page format.
EICAS And Maintenance Messages
EICAS or maintenance messages show these conditions:
*
A fire bottle has Low pressure
*
A bottle squib circuit is open
*
A flow valve squib circuit is open
*
An in-line pressure switch is set
*
The initiated squib test is complete.
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777 AIRCRAFT MAINTENANCE MANUAL
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
LAVATORY WASTE COMPARTMENT FIRE EXTINGUISHING -FIRE EXTINGUISHER BOTTLE
Purpose
The lavatory waste compartment fire extinguisher extinguishes fires in the waste compartment.
Physical Description
The fire extinguisher is a bottle with two nozzles. The bottle contains pressurized halon 1301 fire extinguishing agent. The nozzles are sealed with a solder which melts at approximately 170 F (77 C).
Location
The fire extinguisher is above the waste container in the cabinet under the sink. The fire extinguisher nozzles point into the waste container. Open the cabinet for access.
Functional Description
A fire in the waste container melts the solder on the nozzles. This releases halon from the bottle to put out the fire.
Training Information Point
A temperature indicator on the side of the waste container shows if there has been a fire. You can see the indicator without removing the container to look inside. The indicator circles are normally white. Black circles show a fire.
You can weigh the fire extinguisher to find out if it is empty. Replace an empty bottle; you cannot fill it again.
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LAVATORY WASTE COMPARTMENT FIRE EXTINGUISHING -FIRE EXTINGUISHER BOTTLE
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PORTABLE FIRE EXTINGUISHERS
General
Portable fire extinguishers are located throughout the airplane (Flight Compartment and Passenger Compartment). These consist of nine (9) Bromochlorodifluoromethane (BCF) and two (2) water fire extinguishers. The number of portable fire extinguishers fitted is the same on both the A-market and the IGW airplanes. All are attached by quick-release mounting straps.
The BCF fire extinguishers are located in the stow boxes at the crew seats at Doors 1, 2, and 3, and in the cupboards adjacent to the crew seats at Door 4. There is also a BCF fire extinguisher located in the flight deck.
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