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Sun, May 29, 2005

AD: Turbomecha

AD NUMBER: 2005-11-01
MANUFACTURER: Turbomeca
SUBJECT: Airworthiness Directive 2005-11-01
SUMMARY: The FAA is adopting a new airworthiness directive (AD) for Turbomeca S.A. Arrius 1A turboshaft engines. This AD requires initial and repetitive testing of the Free Turbine Overspeed Protection System. This AD results from an investigation into the Digital Electronic Control Unit (DECU) that revealed a malfunction of the Free Turbine Overspeed Protection System. This malfunction can exist despite the DECU passing all functional tests specified in the Engine Maintenance Manual. We are issuing this AD to prevent uncontained engine failure if a free turbine overspeed occurs.

FMI: www.airweb.faa.gov/ad

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