Airworthiness directives › 2009-14-01
AD 2009-14-01 Airworthiness Directives; Turbomeca S.A. Arrius 2F Turboshaft Engines
Applicability*9
This AD applies to Turbomeca S.A. Arrius 2F turboshaft engines that have not incorporated modification Tf75. These engines are installed on, but not limited to, Eurocopter EC120B helicopters.
Compliance
You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done. O-ring Replacement (f) Replace the O-ring on the check valve piston in the lubrication unit at the intervals specified in Table 1 of this AD. Use the Instructions to be Incorporated paragraphs 2.A. through 2.C.(2) of Turbomeca Alert Service Bulletin No. A319 79 4802, Update No. 1, dated April 3, 2006, to replace the O-ring. Table 1—Compliance Times for O-ring Replacement If the class of oil is: Then replace the O-ring by the later of: Thereafter, replace the O-ring within: (1) HTS or unknown. 300 hours time-since-new (TSN) or 50 hours after March 21, 2007 (effective date of AD 2005-17-17R1). 300 hours time-since-last replacement (TSR). (2) STD. 450 hours TSN or 50 hours after March 21, 2007 (effective date of AD 2005-17-17R1). 500 hours TSR. Mandatory Terminating Action (g) Within 150 flight hours after the effective date of this AD, do the following mandatory terminating action to the repetitive O-ring replacements: (1) Incorporate Turbomeca Modification Tf75 by replacing the check valve piston in the lubrication unit, with a check valve piston requiring no O-ring. (2) Use the Instructions to be Incorporated paragraphs 2.A. through 2.B.(1)(r) of Turbomeca Mandatory Service Bulletin No. 319 79 4075, Version B, dated May 14, 2008, to replace the check valve piston. Alternative Methods of
Unsafe condition
This AD results from the European Aviation Safety Agency (EASA) and Turbomeca S.A. mandating the incorporation of Modification Tf75. The actions specified in this AD are intended to prevent an uncommanded in-flight shutdown of the engine, which could result in a forced autorotation landing and damage to the helicopter.
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