ADF/AAP 7001.038(AM1), MAINTENANCE REQUIREMENTS DETERMINATION (MRD) MANUAL AUSTRALIAN DEFENCE FORCE AUSTRALIAN AIR PUBLICATION (27 JUN 2006)., This publication, although issued as an Australian Air Publication (AAP), is authenticated by the ADF Airworthiness Authority because the content has Tri-Service significance and authority. The single Service markings have been replaced by their Tri-Service equivalents as part of the formation of a proper, structured, binding Defence Publication System for airworthiness, aircraft, aircraft related equipment and other ‘air’ matters under the authority of DI(G) ADMIN 20-31.