COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Seats and Berths AD/SEATS/4 Historical and Ex-Military Aircraft - Harness Attachment Applicability: All aircraft operated under an historical and ex- military Permit-To-Fly. 12/88 Requirement: 1. Inspect seat belt and harness attachments to ensure that they are connected to metal structure - either seat or airframe. 2. If the attachment is to non-metal structure, modify the harness attachments to a scheme acceptable to the Authority. Compliance: Before each issue of Permit-To-Fly. Background: During a forced landing of an ex-military aircraft, the seat belt separated from the crew seat which was manufactured from a type of phenol formaldehyde reinforced material.