COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 747 Series Aeroplanes AD/B747/55 Nacelle Strut Attachment Fitting Bolts 1/87 Applicability: All models with line numbers 1 to 644. Requirement: Action in accordance with Para's A,B,C,D,E & F of FAA AD 86-23-01. Note: Boeing SB 747-57A2235 refers. Compliance: As per Requirement Document from 31 January 1987. Background: The manufacturer reports of fractured H-11 bolts which secure the nacelle strut attachment fittings. One instance reported was of both bolts fractured at one fitting.