COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 747 Series Aeroplanes AD/B747/112 Main Entry Door Guide Arm 7/92 Applicability: Model 747 series, as listed in Boeing ASB 747-52A2237. Requirement: Action in accordance with Boeing ASB 747-52A2237. Note: FAA AD 92-06-07 Amdt 39-8187 refers. Compliance: Prior to 25 August 1992. Background: The FAA received a report of migrating guide arm assembly bearings which may have resulted from insufficient bearing retention during production rework. The actions specified by this Directive are intended to prevent an inoperable emergency door power assist system and/or the inability to operate the door, which is required for emergency evacuation. The effective date required by the FAA is extended by approximately two months.