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it stops when the fire switch is pulled. The fire switch isolates the APU from the airplane systems. 

## Fire Bottle Discharge 

If the fire warnings do not go away with the switch out, put the switch to the left or right DISCH position. Hold the switch against the discharge stop for one second. This fires the bottle squib and releases the fire extinguishing agent into the APU compartment. Verify that the APU bottle discharge light comes on.  [Figure 9-29] 

<img src='content_image/553716.jpg'>

