COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Bell Helicopter Textron 212 Series Helicopters AD/BELL 212/52 Main Driveshaft and Tail Rotor Drive Over-Temperature Indicators 10/94 Applicability: All model Bell 212 helicopters S/N 30501 through 30999, 31101 through 31311, 32101 through 32142 and 35001 through 35066. Requirement: Action in accordance with Bell Helicopter Alert Service Bulletin 212-93-89 Rev A. Note: Transport Canada AD CF-94-07 dated 11 April 1994 refers. Compliance: As specified in the Requirement Document effective from 15 September 1994. Note: The Pilot in Command may carry out and certify in the maintenance release the Requirement Document Part II Serviceability Check required by this directive. Background: Bell Helicopter has advised that the self adhesive temperature indicators are a more reliable means of over temperature indication than that provided by the zinc chromate primer stripe.