Wed, Nov 23, 2011
AD NUMBER: 2011-24-08
MANUFACTURER: Turbomeca S.A. Makila 1A2
Turboshaft Engines
SUBJECT: Airworthiness Directive 2011-24-08
ACTION: Final rule; request for comments.
SUMMARY: The FAA is adopting a new
airworthiness directive (AD) for the products listed above. This AD
results from mandatory continuing airworthiness information (MCAI)
issued by an aviation authority of another country to identify and
correct an unsafe condition on an aviation product. The MCAI
describes the unsafe condition as:
A helicopter experienced an
inadvertent activation of the 65% N1 (gas generator speed) back up
control mode. The subsequent technical investigations carried by
Turbomeca revealed that an N2 (power turbine speed) sensor harness
wire crimping discrepancy was at the origin of this event. Further
quality investigations performed with the supplier led to the
conclusion that N2 sensor Part Number (P/N) 0 301 52 001 0 whose
Serial Numbers (S/N) are between S/N 242 and S/N 339 inclusive are
potentially concerned by the same manufacturing
discrepancy.
This condition, if not corrected,
could lead to the inadvertent activation of the 65% N1 back up mode
and consequently to significant power loss on one or more or both
engines installed on the same helicopter, potentially resulting in
an emergency landing of the helicopter.
The FAA is issuing this AD to prevent inadvertent activation of
the backup control mode, which could result in engine power loss
and emergency landing of the helicopter.
DATES: This AD becomes effective December 7,
2011
FMI:
AD
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