When should "engine running" be communicated?

The communication of "engine running" is crucial for maintaining safety and coordination on the ramp. This announcement should occur when the aircraft's engines are actually operational. When the engines are running, it indicates that the aircraft is in a state that requires increased awareness from ground crew and personnel nearby, as the potential hazards associated with a running engine, such as jet blast and prop wash, are present.

At this point, ground personnel need to be vigilant of their surroundings because the aircraft is active, and certain actions, such as moving equipment or personnel near the aircraft, need to be carefully managed. This communication is a critical safety protocol that helps ensure that everyone involved is aware of the aircraft's status, allowing for safe operations around the aircraft while the engines are running.