COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Allison Turbine Engines - 250 Series AD/AL 250/53 Amdt 1 Compressor Mount Assembly 2/86 Applicability: Model 250-C28 and -C30 series engines which incorporate compressor mount assemblies P/N 6896021, 6898966 or 6898611 with serial numbers as listed in the Requirement Document. Requirement: 1. Inspect compressor mount assemblies P/N 6896021, 6898966 and 6898611 in accordance with Allison CEB-A-72-2080/3081 dated 15 September 1982. 2. Replace compressor mount assemblies P/N 6896021, 6898966 and 6898611 with mount P/N 23007217 in accordance with Allison CEB-72-2085/3085 Rev. 1 dated 30 April 1985. Note: FAA AD 85-25-08 Amendment 39-5189 refers. Compliance: Part 1. In accordance with the Requirement Document. Part 2. At the next compressor assembly overhaul or repair after 28 February 1986 but not later than 30 November 1986. Background: This Directive is amended to include the FAA AD 85-25-08 mandatory introduction of the improved compressor mount assy.