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-260/16 Wing Main Spar Web 6/87 Applicability: All model F260, F260B, F260C and F260D with Serial Numbers up to and including 735. Requirement: Action in accordance with SIAI Marchetti Service Bulletin No. 260-B50. Note: RAI AD 86-199/F260-32 refers. Compliance: 1. Initial Inspection. (a) For aircraft which have achieved less than 1000 hours time in service as at 4 June 1987 - Prior to exceeding 1000 hours time in service or within 500 hours time in service after 4 June 1987, whichever is the later. (b) For aircraft which have achieved 1000 or more hours time in service as at 4 June 1987, but less than 3000 hours - Within 500 hours time in service after 4 June 1987 or prior to exceeding 3100 hours, whichever is the sooner. (c) For aircraft which have achieved 3000 or more hours time in service as at 4 June 1987 - Within 100 hours time in service after 4 June 1987. 2. Repeat Inspections. For all aircraft, repeat the inspections at intervals not exceeding 500 hours time in service until modified in accordance with the Requirement Document. Background: This Directive introduces an inspection for cracks in the wing main spar web.