COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 747 Series Aeroplanes AD/B747/124 H-11 Steel Bolts 7/94 Applicability: Model 747 series aircraft with line numbers 641 through 708, excluding Model 747- 400 series aircraft. Requirement: Action in accordance with the technical requirements of FAA AD 94-07-06 Amendment 39-8864. Note: Boeing SB 747-51-2048 refers. Compliance: As specified in the Requirement Document. Background: Reports were received of cracked and fractured H-11 steel bolts installed at certain locations of the airframe structure. The actions specified in this Directive are intended to prevent the failure of attachment bolts at critical locations.