Is a parachute or restraint harness optional for crewmembers opening doors/hatches in flight?

In the context of C-17 operations, crewmembers are required to wear a parachute or restraint harness when opening doors or hatches during flight. This requirement is in place to ensure their safety, particularly when operating in a non-pressurized environment or when the aircraft is not in a controlled descent. The potential hazards associated with opening these exits at altitude include the risk of being forced out of the aircraft due to high-speed airflow and loss of aircraft control.

The use of a parachute or restraint harness provides an essential layer of protection, allowing crewmembers to maintain their position within the aircraft while performing necessary operations. The regulations and safety protocols underscore the importance of adhering to these equipment requirements for the safety of both the personnel and the aircraft. Therefore, it is not optional; proper safety gear is mandatory in these situations.