content_image/594514.jpg content_image/594515.jpg
<img src='content_image/594514.jpg'>

## Lavatory Fire Extinguisher System 

The lavatory compartment is outfitted with a fire extinguisher bottle to extinguish fires in the waste compartment. The fire extinguisher is a bottle with two nozzles. The bottle contains pressurized Halon 1301 or equivalent fire extinguishing agent. When the temperature in the waste compartment reaches approximately 170 °F, the solder that seals the nozzles melt and the Halon is discharged. Weighing the bottle is often the only way to determine if the bottle is empty or full. [Figure 17-24] 

## Fire Detection System Maintenance 

Fire detector sensing elements are located in many high- activity areas around aircraft engines. Their location, together with their small size, increases the chance of damage to the sensing elements during maintenance. General maintenance of a fire detection system typically includes the inspection and servicing of damaged sections, containment of loose material that could short detector terminals, correcting connection joints and shielding, and replacement of damaged sensing elements. An inspection and maintenance program for all types of continuous-loop systems should include the following visual checks. 

Note: These procedures are examples and should not be used to replace the applicable manufacturer’s instructions. 

Sensing elements of a continuous-loop system should be inspected for the following: 

1. Cracked or broken sections caused by crushing or squeezing between inspection plates, cowl panels, or engine components. 

2. Abrasion caused by rubbing of the element on cowling, accessories, or structural members. 

<img src='content_image/594515.jpg'>

