COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 206 Series Aeroplanes AD/CESSNA 206/41 Rear Wing Spar Doubler 8/85 Applicability: All Model U206 with S/Nos U20601701 to U20604649 (1972 to 1978). (Normally aspirated and turbocharged models which have had a rear wing spar replaced with one shipped from Cessna Supply Division). Requirement: Action in accordance with Cessna S.B. SEB85-9. Compliance: Within 100 hours time in service after 31 August 1985 or at the next scheduled inspection for Maintenance Release issue after 31 August 1985 whichever is the later. Background: The manufacturer suspects that a quantity of spare rear wing spar assemblies may have been shipped from the Cessna Supply Division without a doubler installed near the attach fitting.