COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Bell Helicopter Textron 205 Series Helicopters AD/BELL 205/31 Amdt 1 Tail Boom Attachment Fitting and Longerons - Inspection 5/77 Applicability: All model 205A and 205A-1 with S/Nos. prior to 30260. Document: Bell SB No. 205-77-4. Compliance: As per requirement document.