COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES SIAI Marchetti 260 Series Aeroplanes AD/SM-260/7 Landing Gear Actuator Brackets - Inspection and Modification 7/73 Applicability: All models F260 and F260B with S/Nos. 101 to 125, 2-26 to 2-57, 2-59 to 2-61, 3-76 to 3-81, 3-84 and 502. Document: SIAI Marchetti SB No. 260B13. Compliance: 1. Inspect within 25 hours time in service after 17 July 1975 and thereafter at intervals not exceeding 50 hours time in service until modified. 2. Modify before 1 September 1976.