COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 747 Series Aeroplanes AD/B747/127 Engine Mount Bolt Inspection 9/94 Applicability: Boeing 747 aircraft fitted with Pratt & Whitney JT9D-3 and -7 series engines. Requirement: Action in accordance with the requirements of FAA AD 94-10-05. Compliance: Effective 18 August 1994, as specified in the FAA AD. Background: There have been reports of the forward lower engine mount bolts migrating out of the mount due to loss of the retaining nuts.