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-260/9A Propeller Governor Arm - Inspection and Replacement 11/77 Applicability: Models F260 and F260B with S/Nos. 101 to 125, 2-26 to 2-75, 3-76 to 3-81, 3-84, 502 10-09, 20-01, 235, 237/... to 244/..., 247/... to 254/..., 266/... to 287/... which have not been fitted with a steel propeller governor arm P/N 260-13-274-01 in accordance with para "b" of the requirement document. Document: SIAI Marchetti SB No. 260B18A. Compliance: Inspect within 25 hours time in service after 31 January 1978 and thereafter at intervals not exceeding 50 hours time in service. Compliance with previous issues of this Directive satisfies compliance with this issue.