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Sat, Apr 30, 2005

CASA Urgent AD: Arrius

AD Number: AD/ARRIUS/7 High Pressure Turbine 6/2005 TX
Applicability: Turbomeca ARRIUS 2F engines which are fitted to Eurocopter EC120B helicopters.
Requirement: Do not operate engines fitted with number 2 modules as listed in Alert Fax TURBOMECA 057/05/DSO/TM. Engines may be operated after the engine has received inspection/rework at an approved repair center.
Compliance: From the effective date of this Directive. This Airworthiness Directive becomes effective on 30 April 2005.
Background: Following an accident involving an EC1 208, the initial investigation of the Arrius 2F engine showed that one HP blade was totally released from the HP disk. This blade was contained inside the containment ring. The preliminary examination of the engine parts showed that the standard of one ferrule initiated a disturbance in the secondary air system used to cool the HP turbine.

FMI: www.casa.gov.au

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