COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Pilatus Porter PC-6 Series Aeroplanes AD/PC-6/36 Engine Fuel Line - Replacement 4/76 Applicability: Model PC-6 with S/Nos. 1 to 685, fitted with Lycoming GSO-480-B1A6 engines. Requirement: 1. Replace aluminium fuel line P/N 6238.94. Pos. 80 with a stain- less steel fuel line P/N 6238.94.Pos.80C or with an equivalent fuel line approved by the Secretary. 2. Replace aluminium fittings AN822-8D and AN823-8D with stainless steel fittings MS 20822-BC and MS 20823-8C or with equivalent fittings approved by the Secretary. 3. FAA AD 75-27-06, Amdt. 39-2478. Compliance: Before 1 June 1976.