Thu, Mar 27, 2008
AD NUMBER: 2008-07-01
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
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
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