COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 210 Series Aeroplanes AD/CESSNA 210/48 Fuel Cap Alignment Placard - Installation 9/80 Applicability: Models 210 and T210 with S/Nos. 616, 618, 57001 to 57575 and 21057576 to 21063870; Model P210 with S/Nos. P21000001 to P21000457. Document: 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.