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Mon, Mar 26, 2012

AD: Rolls-Royce Deutschland Ltd & Co KG Turbofan Engines

AD NUMBER: 2012-06-17

PRODUCT: Certain Rolls-Royce Deutschland (RRD) Models Tay 611-8 and Tay 611-8C turbofan engines.
SUBJECT: Airworthiness Directive 2012-06-17
ACTION: Final Rule, request for comments.

SUMMARY: This AD requires replacement of the high-pressure (HP) turbine spanner retaining nut. This AD was prompted by the discovery that certain HP turbine spanner retaining nuts were improperly heat treated after application of silver plating. The FAA is issuing this AD to prevent failure of the HP turbine stage 2 disc, uncontained engine failure, and damage to the airplane.

DATES: This AD becomes effective March 23, 2012. Deadline for comments on this AD is May 7, 2012.

FMI: AD

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