COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 206 Series Aeroplanes AD/CESSNA 206/27 Amdt 1 Vented Fuel Caps 8/80 Applicability: Model 206 with S/Nos. 206-0001 to 206-0275. Model U206 and TU206 with S/Nos. U206-0276 to U206-1444 and U20601445 to U20601666. Model P206 and TP206 with S/Nos. P206-0001 to P206-0603 and P20600604 to P20600647. Requirement: Install vented fuel cap(s) in accordance with Cessna SL No. SE77-6. Note: FAA AD 79-10-14, Amendment 39-3475 refers. Note: Installation of a placard is not an acceptable alternative to installation of vented fuel caps. Compliance: Within 100 hours time in service after 31 August 1979 or before 1 January 1980, whichever is the later. Background: To guard against the possibility of either an obstructed primary vent or sticking of the fuel tank vent valve it has been found necessary to provide secondary venting in the form of vented fuel caps. Due to some misinterpretation of this Directive a NOTE has now been added to disallow the fitting of a placard.