COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 170, 172, F172, FR172 and 175 Series Aeroplanes AD/CESSNA 170/50 Aileron Hinge Pin 1/84 Applicability: Model Serial Number 172N 17271035 thru 17274009, 172P 17274010 thru 17275806, 17275809, 17275817 thru 17275854, 17275857, 17275861 thru 17275881, 17275883 thru 17275910, 17275912 thru 17275947, 17275949 thru 17275953, 17275955 thru 17275958, 17275960 thru 17275971, 17275973, 17275974, 17275976, 17275978, 17275980 thru 17275982, 17275984, 17275986 thru 17275992, 17275994, 17275995, 17275997, 17275999 thru 17276002, 17276005, 17276010, 17276012, 17276014, 172Q 17275869 thru 17275881, 17275883 thru 17275910, 17275912 thru 17275947, 17275949 thru 17275953, 17275955 thru 17275958, 17275960 thru 17275971, 17275973, 17275974, 17275976, 17275978, 17275980 thru 17275982, 17275984, 17275986 thru 17275992, 17275994, 17275995, 17275997, 17275999 thru 17276002, 17276005, 17276010, 17276012, 17276014, 172RG 172RG001 thru 172RG1134, 172RG1137, R172K R1722930 thru R1723454, F172N F17201750 thru F17202039, F172P F17202040 thru F17202146, F17202148 thru F17202175, F17202177 thru F17202181, F17202183 thru F17202186, F17202189 thru F17202194, F17202197, F17202200, F17202202, FR172K FR17200631 thru FR17200675. Requirement: Action in accordance with Cessna S.I.L. SE83-18. Note: FAA AD 83-22-06 refers. Compliance: Unless already accomplished within 100 hours time in service after 31 January 1984 or at the next scheduled inspection for Maintenance Release issue after 31 January 1984, whichever is the later. Background: Possible migration and loss of the aileron hinge pin could result if the retaining split pin holes are incorrectly located.