What is the first step to take when dealing with an external engine fire?

When dealing with an external engine fire, signaling to the pilots is a critical first step. This action is essential because the pilots are responsible for the overall control and safety of the aircraft. By alerting the flight crew, you ensure that they can take appropriate action, such as following emergency protocols, shutting down the affected engine, or preparing for an evacuation if necessary.

Additionally, communication with the cockpit can help coordinate emergency response efforts and ensure that ground personnel are ready to assist with firefighting measures and other necessary actions. Prioritizing this step can potentially save lives and mitigate further damage.

In contrast, opening the access panel, using halon to extinguish the fire, or winding down the engine are actions that might follow after confirming that the pilots are aware of the situation. These steps require additional training and protocol to execute safely and effectively.