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/CF6/26 Stage 11 to 13 Compressor Spool Inspection 12/93 Applicability: CF6-45/-50 series. Requirement: Action in accordance with the technical requirements of FAA AD 93-13-10. Note: GE Service Bulletin No 72-1006 Revision 1 dated 14 November 1991 refers. Compliance: As specified in the FAA AD with effectivity commencing 11 November 1993. Background: There have been reports of fatigue cracking in the 12th stage compressor disc. Consequently, there is need for a one time inspection for cracking and measurement of the stage 12 compressor disc web-to-rim transition area of the stage 11-13 compressor spool. Depending on the results, the items are then to be replaced, reidentified and relifed.