COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES General Electric Turbine Engines - CF6 Series AD/CF6/27 High Pressure Turbine Thermal Shield Inspection 12/93 Applicability: CF6-45, -50, -80A and -80C2 series. Requirement: Action in accordance with the technical requirements of FAA AD 93-14-18. Note: General Electric Service Bulletins 72-1021,-596, and -565 refer. Compliance: As specified in the FAA AD with effectivity commencing 11 Nov 1993. Background: This directive is raised because of a HPT thermal shield separation. Such separations could result in uncontained failure.