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In the event of an engine fire on the ground, the priority is the safety of the occupants and the effective management of the situation. The recommended procedure typically begins with shutting down the engine and shutting off the fuel supply to prevent further fuel from feeding the fire. This step is crucial as attempting to start the engine to extinguish a fire can exacerbate the situation, potentially leading to more severe fire damage and jeopardizing safety.

Shutting down electrical systems could be part of the emergency procedures but is often not the immediate priority compared to controlling the fire itself. Setting the throttle to idle or increasing it could also contribute to worsening the situation, as these actions can allow more fuel or air into the engine area, fueling the fire rather than extinguishing it.

In summary, the proper response emphasizes controlling fuel flow and preventing further ignition sources, thus prioritizing safety and effective emergency management over ineffective attempts to engage the engine under distressed conditions.