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AD: Safran Helicopter Engines, S.A. Turboshaft Engines

AD NUMBER: 2017-05-08

PRODUCT: All Safran Helicopter Engines, S.A. Arriel 2B turboshaft engines.

ACTION: Final Rule

SUMMARY: This AD requires removing any pre-modification (mod) TU 158 hydro-mechanical metering unit (HMU) and replacing with a part eligible for installation.

This AD was prompted by a report of an uncommanded in-flight shutdown (IFSD) on a single-engine helicopter, caused by a low returning spring rate of the needle of the HMU.

The FAA is issuing this AD to correct the unsafe condition on these products.

DATES: This AD becomes effective April 13, 2017.

FMI: AD

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