Which handle should be pulled to shut off a fire in flight?

The selection of the FIREWALL SHUTOFF HANDLE as the action to take in the event of a fire in flight is based on its primary function. This handle is specifically designed to cut off fuel flow to the affected engine, thereby effectively eliminating the potential fuel source for the fire. By pulling this handle, the crew can quickly and efficiently address an in-flight fire, helping to minimize risk and maintain control of the aircraft.

Other handles, such as the Engine Control Lever, do not function to shut off fuel entirely and may still allow for combustion, which could exacerbate the fire situation. The Thrust Reverser handle is generally related to changing the direction of thrust and is not involved in fire suppression. The Fuel Shut Off Valve could theoretically prevent fuel from flowing, but in most aircraft, the FIREWALL SHUTOFF HANDLE is the designated control that directly addresses the emergency of a fire, making it the most effective and appropriate choice in this situation.