This regulation prescribes the policies, responsibilities, processes and/or procedures for airworthiness qualification and system specification compliance of manned and unmanned aircraft systems and subsystems, including the installation of allied equipment and modifications to Army aircraft, and in flight operation of carry-on equipment that impacts or applies to airworthiness. Army aircraft includes all aviation materiel and aircraft that are Army assigned, bailed, borrowed, loaned, leased, owned, or otherwise authorized for operation by Army personnel, or after modification under an Army contract.