MANUFACTURER: Turbomeca Arriel 1 Series
Turboshaft Engines. SUBJECT: Airworthiness Directive 2011-26-02. ACTION: Final rule.
SUMMARY: This AD was prompted by Turbomeca
restoring all or part of the life limits of the affected discs, and
European Aviation Safety Agency's (EASA) issuance of AD
2010-0101R2, dated March 24, 2011, to do the same. Turbomeca has
introduced a reinforced eddy-current inspection (ECI) which,
combined with a revised analysis, allows the life limit of the
affected discs to be extended. The FAA is issuing this revision to
prevent failure of the gas generator (GG) second stage turbine disc
which could result in the release of high energy debris and damage
to the helicopter.