# APU CONTROL

![](//cdn.document360.io/417c2d4d-fdb8-4d4d-b11d-011fe445d776/Images/Documentation/apu-control-panel-image-4qilf5a2.png)

### APU SELECTOR KNOB <a href="#toc118376424" id="toc118376424"></a>

**OFF:** Normal shutdown is initiated. Pneumatic power is removed immediately, electric power is removed at the end of a 1-minute cooldown. Rotating the knob back to ON during shutdown cancels the shutdown sequence.

**ON:** Normal position when running.

**START (Momentary position):** Initiates the APU start cycle.

Note: APU electrical and pneumatic are available 3 seconds after reaching 95% rpm.

![](//cdn.document360.io/417c2d4d-fdb8-4d4d-b11d-011fe445d776/Images/Documentation/apu-control-panel-image-w6bhy1ur.png)

### APU EMERGENCY STOP BUTTON <a href="#toc118376425" id="toc118376425"></a>

<mark style="color:red;">**PUSH IN:**</mark> <mark style="color:red;"></mark><mark style="color:red;">Closes the APU shutoff valve, shutting the APU down without a cool down period. White bar illuminates in the lower half of the button.</mark>

**PUSH OUT:** Normal Position.

{% hint style="info" %}
Red striped bar in the top half of the button illuminates in the event of an APU fire. When pushed in a white striped bar illuminates and the APU FIRE EXTINGUISHER button illuminates.
{% endhint %}

APU Fuel Supply:

* DC power only the DC fuel pump provides fuel to the APU.
* AC power available with engines off, the fuel is provided by the AC fuel pump 2.
* Right engine running fuel is supplied by the ejector fuel pump from the right wing tank.
* Fuel normally supplied from the right or left fuel tank through the crossfeed valve.


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