# FIRE EXTINGUISHER

![](//cdn.document360.io/417c2d4d-fdb8-4d4d-b11d-011fe445d776/Images/Documentation/fire-extinguisher-panel-image-1efo5aqp.png)

### FWD/AFT CARGO FIRE DETECTION/EXTINGUISHER BUTTON (Guarded) <a href="#toc118376420" id="toc118376420"></a>

<mark style="color:red;">Button illuminates if smoke is detected in the respective cargo compartment.</mark>

### FIRE DETECTION SYSTEM TEST BUTTON (Momentary position) <a href="#toc118376421" id="toc118376421"></a>

* Tests the engine fire, APU fire, and cargo smoke detection systems
* Press and hold the test button for a minimum of 3 seconds, but not more than 10 seconds if the APU is running or it will automatically shutdown the APU.
* <mark style="color:red;">Ventilation outflow valve closes – only when bleed air is being provided by the engines or the APU</mark>

![](//cdn.document360.io/417c2d4d-fdb8-4d4d-b11d-011fe445d776/Images/Documentation/fire-extinguisher-panel-image-ffe0r9a8.png)

### APU FIRE EXTINGUISHER BUTTON (Guarded) <a href="#toc118376422" id="toc118376422"></a>

* <mark style="color:red;">Illuminates in the event of a fire when APU EMER STOP button is pressed.</mark>
* <mark style="color:red;">Illumination turns OFF when the fire input from the APU fire detectors disappears.</mark>
* <mark style="color:red;">APU FIRE EXTINGUISHER button pressed:</mark>
  * <mark style="color:red;">Discharges the APU fire bottle.</mark>
  * <mark style="color:red;">Shuts down the APU through the APU FADEC</mark>
  * <mark style="color:red;">Closes the APU fuel shutoff valve (SOV)</mark>


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