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 B.  The fire extinguisher bottle is mounted inside the lavatory cabinet.
 3.  Temperature Indicator_____________________
 A.  The temperature indicator is a thin vinyl plate containing four heat sensitive patches. Each patch changes color from grey to black when exposed to temperatures from 180 to 250°F.
 B.  The temperature indicator is inside the lavatory cabinet.
LAVATORY TOWEL CHUTE

SEE LAVATORY FIRE EXTINGUISHER
HEAT FUSIBLE TIPS BLACK WHEN EXPOSED TO TEMPERATURE MARKED

Lavatory Fire Extinguishing System Component Location
Figure 1

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A 737-300/400/500MAINTENANCE MANUAL
 4.  Operation
_________
 A.  The extinguisher bottle contains two fusible tips with melting temperature of 174°F. When fire or overheat occurs in the lavatory waste compartment raising the ambient temperature above 174°F, the temperature indicator will change color and the fusible tips will melt, causing the bottle to discharge.
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737-300/400/500MAINTENANCE MANUAL
 LAVATORY FIRE EXTINGUISHER BOTTLE - INSPECTION/CHECK
____________________________________________________
 1.  General
 A.  This subject has one task. The task makes a check of the Fire
 Extinguisher Bottle in the Lavatory.

 TASK 26-24-11-216-001
 2.  Lavatory Fire Extinguisher Bottle Check (Fig. 601) --------------------------------------------------
A.  Access
 (1)  Location Zone
 (a)  113, 114, 118, 103 Lavatories
 B.  Procedure
 S 016-002
 (1)  
Get access to the inside of the lavatory sink cabinet and make a check of the temperature indicator. The temperature indicator is found on the towel chute.

 S 026-003

 (2)  
If the temperature indicator shows the bottle has become too hot, remove the bottle from the towel chute and weigh it. Replace the bottle if its weight is less than 10 grams (HTL) or 15 grams (Kidde) below the weight mark on the label.

 S 026-005

 (3)  
Replace the bottle and the temperature indicator if the bottle weight is low. Replace only the temperature indicator if the bottle weight is correct.

 S 026-006

 (4)  
Replace the bottle if it has these problems:

 (a)  
The bottle has dents with depths of more than 1/16 of an inch for each inch of the average dent diameter.

 (b)  
The bottle has scratches of depth greater than 0.004 inch.

 

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(TYPICAL)
BLACK WHEN EXPOSED TO TEMPERATURE MARKED

A

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 (c)  The bottle weighs less than 10 grams (HTL) or 15 grams (Kidde) below the correct weight shown on the bottle.
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