How far must you stand from engine intakes during Idle power settings?

When an aircraft like the Super Hornet is operating at idle power settings, it is crucial to maintain a safe distance from the engine intakes to prevent injury from the aerodynamic effects of the airflow and potential debris. The recommended distance of 9 feet ensures that personnel are far enough away from the powerful suction and possible discharge airflow generated by the engines while still allowing for necessary operations and oversight.

Standing too close can pose serious safety risks, including being pulled into the intake or affected by the force of the air being drawn into the engine. This distance strikes a balance between maintaining operational integrity around the aircraft while ensuring the safety of all personnel involved. Within the context of engine operations, safety protocols like this are established to protect individuals working around the aircraft during various power settings, including idle. Therefore, the correct answer reflects established safety guidelines in aviation operations.