What is the first action taken in case of fire in flight if confirmed?

In the event of a confirmed fire in flight, the first action taken is to turn the throttle or Power Control Lever (PCL) to the OFF position. This step is crucial as reducing the engine's power immediately helps to minimize further fuel feed to the fire, potentially limiting its severity and allowing the pilot to prioritize emergency procedures.

Turning the PCL to OFF can assist in the management of the aircraft's systems and will enable the pilot to reassess the situation while focusing on maintaining control of the aircraft. This action is part of standard emergency procedures designed to safeguard the crew and the aircraft. Other options, while relevant in specific circumstances, do not address the immediate need to cut off the fuel source, which is vital in a fire emergency.