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Thu, Jun 02, 2016

AD: Turbomeca S.A. Turboshaft Engines

AD NUMBER: 2016-11-09

PRODUCT: Turbomeca S.A. Arriel 1D and 1D1 turboshaft engines with a pre-modification (mod) TU357 gas generator module (M03), installed.

ACTION: Final Rule

SUMMARY: This AD requires removing the pre-modification (mod) TU357 gas generator module (M03) and replacing with a part eligible for installation.

This AD was prompted by reports of divergent rubbing between the piston shaft small diameter labyrinth and the rear bearing support.

The FAA is issuing this AD to prevent failure of the labyrinth seal and engine, in-flight shutdown, and loss of control of the helicopter.

DATES: This AD becomes effective July 5, 2016

FMI: AD

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