COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Short SD3-60 Series Aeroplanes AD/SD3-60/32 Main Wheel Tyres 4/91 Applicability: Model SD3-60 Series 300; plus aircraft Serial Numbers SH3708, SH3712, SH3713, SH3714, SH3715. Requirement: Action in accordance with Mandatory Dunlop Limited SB 32-1044. Note: Shorts SD3-60 IL-171 refers. Compliance: As specified in the Requirement Document but with a revised effectivity date of 18 April 1991 for Australian registered aircraft. Background: Premature failure of main landing gear tyres part number DR19922T has occurred.