What action should be taken with the Jet pump switches during an engine fire?

During an engine fire, placing the Jet pump switches to the OFF position is a critical safety procedure. This action helps to prevent additional fuel from being supplied to the engine, which could exacerbate the fire and lead to catastrophic failure. By cutting off the fuel supply, it reduces the possibility of further ignition and allows for a more controlled response to the emergency.

In the context of emergency procedures, ensuring that no more fuel is being delivered to the affected engine is essential. The Jet pump switches are part of the system that manages fuel flow, and by shutting them off, you effectively isolate the fuel source.

While leaving the switches in the ON position would continue to supply fuel, setting them to the emergency position might not be appropriate without specific operating protocols calling for it in response to an engine fire. Simply checking their functionality does not address the immediate danger posed by the fire, making it an insufficient action in such a critical situation. Therefore, the optimal response is to turn the Jet pump switches OFF to mitigate the threat posed by the fire.