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Fri, Sep 29, 2006

AD: Rolls-Royce

AD NUMBER: 2006-20-07
MANUFACTURER: Rolls Royce
SUBJECT: Airworthiness Directive 2006-20-07
SUMMARY:
The FAA is adopting a new airworthiness directive (AD) for Rolls-Royce Corporation (RRC) models 250-C30, 250-40, and 250-C47 series turboshaft engines with a third-stage turbine wheel, part number (P/N) 6898663 or P/N 23065843 installed, or a fourth-stage turbine wheel, P/N6892764 or P/N 23066744, installed. This AD adds an additional life limit for third- and fourth stage turbine wheels.

This AD results from analysis by RRC of failures of third-stage turbine wheels.

We are issuing this AD to prevent loss of power, possible engine shutdown, or uncontained engine failure.

FMI: www.faa.gov/regulations_policies/airworthiness_directives/

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