What should be done if an engine fire is discovered on the ground?

When an engine fire is discovered on the ground, the most prudent action is to evacuate the aircraft immediately. This response prioritizes the safety of all occupants, as aircraft engine fires can escalate quickly and become life-threatening.

While it may seem that cranking the engine until it starts is a viable option in some scenarios, in the case of an engine fire, this action could exacerbate the situation. Starting the engine with an ongoing fire is extremely dangerous and could result in a more severe fire or cause an explosion.

Engaging the fuel shutoff valve alone may not be sufficient to extinguish the fire. Immediate evacuation allows for a quicker response from emergency services, who can properly handle the situation with the right equipment.

Reducing the RPM to 1000 may be part of a normal operating procedure for engine management; however, in the case of an engine fire, it would not be relevant as the priority must be on evacuating the aircraft swiftly.

Thus, the recommended action is to evacuate the aircraft immediately to ensure the safety of all individuals aboard.