At what distance is it required to wear a cranial when the engines are running?

Wearing a cranial helmet when engines are running is a crucial safety measure to protect personnel from potential hazards associated with engine operation. The requirement to wear a cranial at a distance of 100 feet ensures that individuals are clear of any areas where debris or objects could be propelled by the thrust of jet engines or rotor wash.

At this distance, personnel not only have a better chance of avoiding direct exposure to hazards but also minimizes the risk of hearing damage from noise generated by the engines. The presence of a cranial serves as a form of protective gear that can help mitigate injuries in environments where the likelihood of falling objects, high noise levels, and other threats are present during operations.

This distance reflects standard procedures typically outlined in safety manuals and guidelines for working around aircraft, emphasizing the importance of maintaining a safe perimeter during engine operations.