Fri, Sep 19, 2003
AD NUMBER: 2003-16-03
MANUFACTURER: Turbomeca (CORRECTION)
SUBJECT: Airworthiness Directive 2003-16-03
SUMMARY: This amendment supersedes an existing
airworthiness directive (AD) that applies to Turbomeca
Arriel 1A, 1 A1, 1 A2, 1 B, 1 C, 1 C1, 1 C2, 1 D,
and 1 D1 turboshaft engines. That AD currently
requires repetitive checks for engine rubbing noise during gas
generator rundown following engine shutdown, and for free rotation
of the gas generator by rotating the compressor manually after the
last flight of the day. In addition, the AD 95-11-01 requires
installation of modification TU202 or TU 197 as terminating action
to the repetitive checks. This amendment adds additional engine
models to the applicability section, eliminates the installation of
modification TU 197 as a terminating action to the repetitive
checks, requires additional inspections for engines that have
modification TU 197 installed, and requires the replacement of
modifications TU 76 and TU 197 with modification TU 202, as a
terminating action to the repetitive checks and inspections. This
amendment is prompted by a report of an in-flight engine shutdown
on an engine that had modification TU 197 installed, and the need
to update the modification standard on certain engine models. We
are issuing this AD to prevent engine failure due to rubbing of the
2nd stage turbine disk on the 2nd stage turbine nozzle guide vanes,
which could result in complete engine failure and damage to the
helicopter.
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