# POWERPLANT

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![](https://cdn.document360.io/417c2d4d-fdb8-4d4d-b11d-011fe445d776/Images/Documentation/image-1670245414428.png)

### START/STOP SELECTOR KNOB <a href="#startstop-selector-knob" id="startstop-selector-knob"></a>

* **STOP:** commands the FADEC to shut down the engine, provided the associated thrust lever is in the IDLE position.
* **RUN:** normal position for engine operation.
* **START (momentary action):** initiates the engine start sequence.

### IGNITION SELECTOR KNOB <a href="#ignition-selector-knob" id="ignition-selector-knob"></a>

* <mark style="color:red;">OFF: deactivates the ignition system. On ground, fuel flow is inhibited. FADEC disregards OFF position in flight.</mark>
* AUTO: FADEC automatically controls the ignition system, depending on engine requirements.
* <mark style="color:red;">OVRD: enables FADEC ton continuously activate both exciters whem the engine is running.</mark>