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/RB211/2 H.P. Compressor Stage 1 and 2 Disc - Removal 1/82 Applicability: RB211-22B-02, 524-02, 524B-02, 524B2-19, 524B2-39, 524B3-02 and 524C2-19 incorporating HP compressor stage 1 and 2 disc assemblies specified in Alert SB RB211-72-A5885, Rev. 2. Document: Rolls Royce RB211 SB RB211-72-A5885, Rev. 2. Compliance: In accordance with the requirement document. Background: Removal of suspect discs is necessary to prevent uncontained failures.