COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Short SD3-30 Series Aeroplanes AD/SD3-30/29 Main Landing Gear - Beam Sub Assembly 5/95 Applicability: All Model SD3-30 series aeroplanes equipped with Menasco MLG beam assembly P/N 17501 serial numbers MMC-005 to MMC-068 and MMC-071 to MMC-188 inclusive. Requirement: 1. Rework the MLG beam sub-assembly P/N 17604-9, -13, -13A/14A, -15/16 or -17/18 in accordance with Shorts Service Bulletin SD3-32-90, Revision 2. 2. Remove from service MLG beam sub-assembly P/N 17604-9, -13 or -13A/14A. Note: FAA AD 93-14-03 refers. Compliance: 1. Rework in accordance with Requirement 1 before 13 500 total component landings or before 2 300 component landings from 27 April 1995, whichever occurs later. 2. Action in accordance with Requirement 2 before 20 000 total component landings. Background: Fatigue testing has revealed that there is a stress raiser at the lower edge of the bore where the beam ID intersects with the axle hole. The rework increases the radius of the intersection. Other locations of high stress are also radiused.