COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters AD/BELL 206/85 Amdt 1 Fuel Filter and Hoses Installation - Modification 9/81 Applicability: All models Bell 206L-1 with S/Nos. 45154 to 45448 except as noted in Bell ASB 206L-80-13, and single pilot IFR equipped models listed in ASB 206L-81-19. Document: Bell SB 206L-80-13 & for single pilot IFR helicopters Bell SB 206L-81-19. Note: FAA AD 81-06-05 refers. Compliance: Within 100 hours time in service after 30 September 1981. Background: The Airworthiness Directive is amended to include a modification to the freewheeling vent hose on single pilot IFR equipped helicopters.