COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 747 Series Aeroplanes AD/B747/23 Outboard Engine Strut Diagonal Brace Forward Clevis Root - Inspection and Modification Applicability: All model 747 equipped with CF6, JT9D-3 or JT9D-7 engines. Document: 1. FAA AD 80-08-02, Amdt. 39-3738; or 2. Boeing SB No. 747-54-2070. Compliance: As per requirement document No. 1. 7/80 Background: An overseas operator has detected transverse cracks in clevis root of brace. Defect is attributed to local thickness being less than specified.