COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 210 Series Aeroplanes AD/CESSNA 210/10 Amdt 3 Main Landing Gear Actuators - Modification 12/75 Applicability: All 210 Series with S/Nos. 21058510 and below. Requirement: Unless previously accomplished, replace all integral flange and gear spindle assemblies, Cessna P/No. ED11935L and R, with modified splined shaft and sector listed in: 1. Cessna SL SE69-17 - for aircraft S/No. 21058460 and below; 2. Cessna SL SE75-21 - for aircraft S/Nos. 21058461 to 21058510. Compliance: For Sub-Para. 1 - Within 300 hours time in service after 29 June 1973 or at first major inspection after 1 September 1973, whichever occurs first. For Sub-Para. 2 - Before 1 September 1976. Note: Aircraft complying with DCA/CESSNA 210/10A or 10B satisfy compliance with this issue of the Directive.