Who are Additional Crewmembers (ACM)?

Additional Crewmembers (ACM) refer to individuals who are on flight orders and traveling on Air Mobility Command (AMC) aircraft, but not actively engaged in their primary duties during that flight. This designation typically applies to crewmembers who are present for a variety of reasons other than executing their primary roles, such as gaining experience, fulfilling specific mission requirements, or supporting operational needs. Their presence does not affect the primary flight operations but may provide backup or additional support when necessary.

In this context, the other choices do not accurately define ACM. For instance, pilots flying on vacation do not fall under the ACM category since they are not in an official duty status. Crewmembers engaged in technical training may be on an aircraft but not classified as ACM unless they meet the specific criteria of being on flight orders without performing their primary duties. Passengers on duty travel also do not fit the ACM definition as they are not crewmembers actively involved in any capacity related to flight operations. Therefore, the definition of Additional Crewmembers is specifically aligned with those who are on mission orders but are not engaged in their primary responsibilities during the flight.