Document ID: chunk:federal_register_of_legislation:F2006B08711:body:0
Version: federal_register_of_legislation:F2006B08711
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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY
 SCHEDULE OF AIRWORTHINESS DIRECTIVES

 Rolls Royce Turbine Engines - Dart Series

AD/DART/25 High Pressure Impeller Replacement 13/94

            Applicability: All Rolls Royce Dart Series engines that incorporate a pre-Mod.1475 standard High Pressure Impeller.

            Requirement: Replace the high pressure impeller in accordance with Rolls Royce Service Bulletin Da 72-307, Revision 5 dated Sept.94 (RR Mod.1475).

            Note: CAA (UK) AD 004-09-94 also refers.

            Compliance: Effective 8 December 1994, at the first engine shop visit at which the HP compressor area is exposed but no later than 30 June 1995.

            Background: Pre-Mod 1475 H.P. Impellers have experienced vane tip failures caused by a particular mode of vibration being excited within the engine operating R.P.M. range.