COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Bell Helicopter Textron 204 Series Helicopters AD/BELL 204/25 Swashplate Support Assembly NK P/N 204-011-404-9 - Replacement Applicability: All models 204B. Document: Bell SB No. 204-76-6. Compliance: As detailed in the requirement document.