COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Beechcraft 77 (Skipper) Series Aeroplanes AD/BEECH 77/1 Wing Attachment Bolts and Nutplates 2/80 Applicability: All model 77 with S/Nos. WA-1 to WA-39, WA-41, WA-42 and WA-44 to WA-46. Requirement: Action in accordance with Beechcraft SI No. 1088. Compliance: Unless already accomplished, prior to further flight. Background: It is possible that thread damage may have occurred to the wing attach bolts and/or the internal nut plates.