COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Auxiliary Power Units AD/APU/1 Turbine Blade Containment Ring - Installation NK Applicability: Airesearch Model No GTCP85-98D with Serial No. prior to 28008. -98W with Serial No. prior to 30734. -99 with Serial No. prior to 14744. -115 with Serial No. prior to 18801. -115C with Serial No. prior to 35975. Document: Airesearch SB No. 49-1790. Compliance: Before installation in an aircraft following next reconditioning or hot end repair after 30 November 1971.