Document ID: chunk:federal_register_of_legislation:F2006B07591:body:0
Version: federal_register_of_legislation:F2006B07591
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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 - Viper Series

AD/VIPER/9 Engine Centre Section 9/90

 Applicability: Viper Mk 601-22 and Viper Mk 520, 521 and 522 engines.

            Requirement: Inspect engine compressor casing/centre section joint flange in accordance with and as applicable:

            Rolls Royce Viper Mk 601-22 Service Bulletin No 72-A173; or

            Rolls Royce Viper Mk 520, 521, and 522 Service Bulletin No 72-A388.

 Compliance: (1) Engines in service - Prior to 6 August 1990.

            (2) Uninstalled engines - Prior to installation in an aircraft.

            Background:  Investigation of an engine established that the compressor casing/centre section joint had parted at the top, causing heavy bending loads on the turbine mainshaft causing spline failure. Parting of the compressor casing/centre section has been attributed to thermal stress pulling fastener inserts from the centre section.