COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Rolls Royce Turbine Engines - RB211 Series AD/RB211/10 Amdt 1 High Pressure Compressor Disc 9/87 Applicability: RB211-524 Series Engines. Requirement: Remove from service, stage 1 and stage 2 high pressure compressor disc assemblies identified by serial number in Rolls Royce Service Bulletin RB211-72-A7774 Rev 2 Appendix 3 and Appendix 4. Note: FAA AD 86-15-01 Amdt 39-5346 refers. Compliance: In accordance with Requirement Document. Background: This Directive has been amended to reflect the manufacturers latest revision to Service Bulletin RB211-72-A7774. The revision, in part, increases the number of discs in Appendix 3 and Appendix 4.