Airworthiness directives › 2010-20-05
AD 2010-20-05 Airworthiness Directives; Turboméca S.A. ARRIEL 2B Turboshaft Engines
Applicability*9
This AD applies to Turboméca S.A. ARRIEL 2B turboshaft engines that do not have Modification TU 149 incorporated. These engines are installed on, but not limited to, Eurocopter AS350B3 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. HMUs Without Modification TU 149 (f) Within 20 operating hours of the effective date of this AD, check the fuel metering system and perform maintenance procedures in accordance with Paragraph 2 of Turboméca MSB A292 73 2814, Version D, dated October 16, 2009. (g) Repeat the maintenance procedures of paragraph (f) of this AD within every 210 operating hours. Optional Terminating Action (h) Modifying the HMU to Modification TU 149 terminates the repetitive inspection requirements specified in paragraph (g) of this AD. You can find guidance on modifying the HMU to Modification TU 149 in Turboméca Service Bulletin 292 73 2149, Version C, dated August 10, 2009. Previous Credit (i) Maintenance performed prior to the effective date of this AD using Turboméca MSB A292 73 2814, Version C, dated December 19, 2006, or an earlier version of this MSB, satisfies the maintenance requirements of paragraph (f) of this AD. Alternative Methods of
Unsafe condition
This AD results from reports of engines with modification TU 132 incorporated experiencing stuck acceleration control axles in the hydromechanical unit (HMU) metering valve body. We are issuing this AD to prevent loss of control of engine fuel flow in manual control mode or mixed control mode, which can lead to engine overspeed, and in-flight engine shutdown resulting in a forced autorotation landing or accident.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1