During a hot brake fire emergency, what is the first step?

In the event of a hot brake fire emergency, the first step involves giving the pilot the Hot Brakes signal. This action is critical because it promptly informs the pilot of a potentially dangerous situation that may require immediate action. By relaying this information, the pilot can take necessary measures to ensure the safety of everyone involved and manage the aircraft’s response to the emergency.

It's important to understand that quickly notifying the pilot allows for a coordinated effort in addressing the situation. The pilot may be in the best position to maneuver the aircraft if needed and can begin preparing for emergency procedures, such as shutting down the engines or evacuating the aircraft if the situation escalates.

The other options, while they may be part of the overall emergency response process, do not take precedence over notifying the pilot. For instance, alerting emergency services is crucial but should follow the immediate communication with the pilot. Keeping personnel close to the aircraft poses a safety risk and is counterproductive in this emergency scenario, while attempting to extinguish with water can be dangerous as it may react adversely with burning materials.