COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 747 Series Aeroplanes AD/B747/50 Inboard Pylon Upper Link 6/86 Applicability: All models, line No's 1 to 616, with JT9D-3 or -7, or CF6-45 or -50 engine struts. Requirement: Inspect in accordance with: 1. FAA AD 86-07-06 (Sections A and C) or, 2. Boeing Service Bulletin 747-54-2111, Revision 1. Compliance: As detailed in Requirement Document No. 1. until modified in accordance with Requirement Document No.2. Background: Cracks have occurred in the forward lug of the inboard pylon upper link. If not corrected, this could result in separation of an engine from an aircraft.