Airworthiness directives › 2005-13-25R1
AD 2005-13-25R1 Airworthiness Directives; Turbomeca S.A. Arriel 2B Turboshaft Engines
Applicability*9
This AD applies to Turbomeca S.A. Arriel 2B turboshaft engines with Modification TU62A incorporated, but do not have Modification TU132. 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. Hydromechanical Units (HMUs) Without Modification TU132 (f) Within 20 operating hours after July 11, 2005, the AD's original effective date, inspect, clean, lubricate, and check for proper operation of the HMU acceleration controller axle. Use paragraph 2 of Instructions to be Incorporated of Turbomeca Alert Mandatory Service Bulletin No. A292 73 2814, Update No. 1, dated January 11, 2005, or Update No. 2, dated December 15, 2006, to do these actions. (g) Thereafter, repeat the actions specified in paragraph (f) of this AD within every 210 operating hours. Optional Terminating Action (h) Modifying the HMU to Modification TU132, terminates the repetitive inspection requirements specified in paragraph (g) of this AD. Turbomeca Service Bulletin No. 292 73 2132, dated May 31, 2006, contains information on modifying the HMU to Modification TU132. Alternative Methods of
Unsafe condition
This AD results from the engine manufacturer releasing a service bulletin to introduce modification TU132. 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