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Tue, Jan 27, 2009

AD: Turbomeca

AD NUMBER: 2009-01-11
MANUFACTURER: Turbomeca
SUBJECT: Airworthiness Directive 2009-01-11
SUMMARY
: We are 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: Several cases of loss of internal components from the Hydro Mechanical Unit (HMU) low fuel pressure switch Hydra-Electric part number (P/N) 9 550 17 956 0 into the fuel system, have been reported on Arriel 2 engines. The loss of internal components from the low fuel pressure switch into the fuel system may lead to a rupture of the HP-LP pumps drive shaft shear pin, and thus to a possible uncommanded in-flight shutdown (IFSD). On a single-engine helicopter, an uncommanded IFSD results in an emergency auto rotation landing and in certain conditions may lead to an accident. We are issuing this AD to prevent forced auto rotation landing, or an accident.

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

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