COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Short SD3-30 Series Aeroplanes AD/SD3-30/12 Amdt 1 Rib/Skin Attachment Cleats at Left Wing Station 160 13/93 Applicability: Model SD3-30 with serial numbers SH3002 through SH3090. Requirement: Action in accordance with Shorts Mandatory Service Bulletin SD3-57-10 Revision 2. Compliance: As specified in the Requirement Document, with flight hours to count from previous certified compliance. This Amendment is effective from 9 December 1993. Background: The manufacturer received reports of cases where cracks have been detected in the rib/skin attachment cleats at the wing upper surface, Station 160. Amendment 1 is issued in response to the latest issue of the Requirement Document which aligns SB Paragraph 1.E, Part A,4 with the "Not Exceed Time" specified in the Maintenance Programme.