COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 188 (Agwagon) Series Aeroplanes AD/CESSNA 188/35 Fuel Cap Alignment Placard 9/80 Applicability: Model A188 (with wing tanks) with S/Nos. 653, 188-0446 to 188-0572, 18800573 and subsequent, Model A188B with S/Nos. 18800967T and subsequent. Requirement: Action in accordance with Cessna SIL No. SE 80-59. Compliance: Within 100 hours time in service after 30 September 1980. Background: Correct alignment of flush fitting type fuel caps is essential for efficient operation of the fuel tank secondary vent system.