At what distance must safety cones be placed on all wide body aircraft?

The correct placement of safety cones for wide-body aircraft is at the outer edge of the engine. This is essential for ensuring safety during aircraft operations, particularly when servicing or loading activities are taking place. By placing cones at the outer edge of the engine, it creates a clear visual warning zone to keep personnel at a safe distance from potential hazards associated with engine operation or movement.

The area around the engines is particularly critical due to the high-risk nature of jet engines, including the potential for engine start-ups or thrust reversals during maintenance operations. Keeping personnel safely away from this zone minimizes the risk of accidents.

Placing cones at other suggested locations may not provide adequate warning or may not effectively protect personnel from the specific dangers present around the engine area. This makes the preference for the outer edge of the engine the most logical and safety-conscious answer.