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_________________________________________________________ DESCRIPTION AND OPERATION
_________________________
 1.  General_______
 A.  The lavatory waste compartment automatic fire extinguishing system provides fire extinguishing capability to the lavatory waste compartment. Extinguishing occurs by flooding the lavatory waste compartment with an inert gas.
 2.  Component Details (Fig. 1)_________________
 A.  Fire Extinguisher Bottle
 (1)  
The fire extinguisher bottle includes an elongated spherical steel container with discharge tubes (fusible tips) and mounting bracket. The container is about 2.5 inches in diameter with volume of approximately 10 cubic inches. The container is filled with a halon extinguishing agent which leaves no residue when discharged.

 (2)  
The fire extinguisher bottle is mounted inside the lavatory cabinet assembly on the waste disposal chute. The two discharge tubes extend into the waste container.

WASTE CHUTE LAVATORY FIRE
MOUNTING BRACKET

BLACK WHEN EXPOSED TO TEMPERATURE ABOVE 180`F
MOUNTING
SCREW (2 PLACES)

HEAT FUSIBLE NOZZLES (2 PLACES)
NOZZLE SEAL SEE

TYPICAL LAVATORY FIRE EXTINGUISHER

A
BOTTLE INSTALLATION
Waste Compartment Automatic Fire Extinguishing - Component Location
Figure 1

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 26-24-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 B. Temperature Indicator
 (1)  
The temperature indicator is a thin vinyl plate containing four heat sensitive patches. Each patch will change color from grey to black when exposed to temperatures from 180 to 250°F.

 (2)  
The temperature indicator, with self-adhesive backing, is located inside the lavatory cabinet assembly below the extinguisher bottle discharge tubes.

 3. Operation
_________
 A. Functional Description
 (1)  The lavatory waste compartment fire extinguishing system is completely self-contained and automatic. The extinguisher bottle contains two fusible tips which have a melting temperature of 174°F. When a fire or overheat condition occurs in the lavatory waste compartment raising the ambient temperature above 174°F, the tips will melt causing the bottle to discharge.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 AUTOMATIC FIRE EXTINGUISHER - MAINTENANCE PRACTICES
___________________________________________________
 1.  General_______
 A.  The following procedure includes removal/installation of the lavatory waste compartment automatic fire extinguisher (par. 2). An inspection/check of waste compartment fire extinguishing system is also included (par. 3).
 TASK 26-24-01-022-001
 2.  Automatic Fire Extinguisher Removal/Installation (Fig. 201)________________________________________________
 A.  Remove The Fire Extinguisher
 S 012-002
 (1)  
Open the sink cabinet waste compartment door.

 S 022-003

 (2)  
Access the extinguisher and remove the mounting screws (2 places).

 S 022-004

 (3)  
Hold the extinguisher bottle and carefully remove the extinguisher nozzles through the holes in seal.

 B.  Install The Fire Extinguisher
 S 422-005
 (1)  
From the sink side of the waste chute, carefully insert the extinguisher nozzles through the holes in the seal and position the extinguisher over the mounting holes.

 S 752-006

 (2)
Make sure the extinguisher nozzles go inside the waste chute.

 S 432-007

 (3)  
Attach the mounting screws (2 places).

 S 432-008

 (4)
Replace the aluminum tape seals around the nozzles if necessary.

 (5)  
Close the sink cabinet waste compartment door.

 S 432-009
　
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