COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Diamond (HOAC) Series Aeroplanes AD/DIAMOND/3 Nose Wheel Leg 7/98 DM Applicability: Model DV20 with serial numbers 20.005 through 20.160. Requirement: Check the nose wheel leg weld for cracks using the fluorescent penetrant method, in accordance with Diamond Aircraft Industries Service Bulletin 20-32. Note: Austrian AD No. 86 refers. Compliance: Unless the initial inspection is already accomplished, within 20 hours time in service after 6 May 1998; thereafter at intervals not to exceed 100 hours time in service, until a version 'B' nose wheel leg is installed. This airworthiness directive becomes effective on 6 May 1998. Background: The manufacturer has identified the possibility of cracks occurring in the weld of the nose wheel tappet.