COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 747 Series Aeroplanes AD/B747/45 Aft Pressure Bulkhead Damage 2/86 DM Applicability: All models. Requirement: Action in accordance with the technical requirements of FAA AD 85-22-12. Compliance: Prior to 20 December 1985. Background: The manufacturer has received reports of aft bulkhead damage and repairs which are unairworthy.