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Thu, Mar 27, 2008

AD: Turbomeca

AD NUMBER: 2008-07-01
MANUFACTURER: Turbomeca
SUBJECT: Airworthiness Directive 2008-07-01
SUMMARY: The FAA is superseding an existing airworthiness directive (AD) for certain Turbomeca Arriel 1B,1D, 1D1, and 1S1 turboshaft engines.

That AD currently requires initial and repetitive position checks of the gas generator 2nd stage turbine blades on all Turbomeca Arriel 1B, 1D, 1D1, and 1S1 turboshaft engines.

That AD also currently requires initial and repetitive replacements of 2ndstage turbines on 1B, 1D, and 1D1 engines only.

This AD requires adding a 3,000 hour life limit to Arriel 1B 2nd stage turbine blades. This AD results from reports of failures of second stage turbine blades.

We are issuing this AD to prevent failures of the 2nd stage turbine blades, which could result in uncommanded in-flight engine shutdown, and subsequent forced auto rotation landing or accident.

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

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