COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 180, 182 and Wren 460 Series Aeroplanes AD/CESSNA 180/56 Amdt 1 Vented Fuel Caps 8/80 Applicability: Model 180 with S/Nos. 604, 624, 645, 30000 to 32999, 50001 to 50911 and 18050912 to 18052202. Model 182 with S/Nos. 613, 631, 634, 33000 to 34999, 51001 to 53007 and 18253008 to 18260638. Requirement: Install vented fuel cap(s) in accordance with Cessna SL No. SE77-6. Note 1: FAA AD 79-10-14, Amendment 39-3475 refers. Note 2: 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.