2012-18-18: Gas generator (GG) turbine blade

Adoption of the Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows: PART 39--AIRWORTHINESS DIRECTIVES 0 1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. Sec. 39.13 [Amended] 0 2. The FAA amends Sec. 39.13 by removing airworthiness directive (AD) 2011-13-05, Amendment 39-16728 (76 FR 40222, July 8, 2011), and adding the following new AD: 2012-18-18 Turbomeca S.A.: Amendment 39-17195; Docket No. FAA-2011- 0115; Directorate Identifier 2010-NE-40-AD. (a) Effective Date This airworthiness directive (AD) is effective October 24, 2012. (b) Affected ADs This AD supersedes AD 2011-13-05, Amendment 39-16728 (76 FR 40222, July 8, 2011). (c) Applicability This AD applies to Turbomeca S.A. Arriel 2B, 2B1, 2S2, and 2C2 turboshaft engines not modified by TU166 modification. (d) Unsafe ConditionThis AD was prompted by reports of an accident involving a twin- engine helicopter powered by two Arriel 2S2 engines. We are issuing this AD to prevent rupture of a gas generator (GG) turbine blade, which could result in an uncommanded in-flight shutdown and a forced landing or accident. (e) Compliance Comply with this AD within the compliance times specified, unless already done. (1) For Arriel 2B and 2B1 turboshaft engines, accomplish the TU166 modification in accordance with the instructions specified within Turbomeca Alert Mandatory Service Bulletin (MSB) No. A292 72 3166 Version B, dated September 20, 2010, when the GG Turbine is replaced or when the engine or Module M03 is going through overhaul or repair, or within 676 cycles-in-service (CIS) after the effective date of this AD, whichever occurs first. (2) For Arriel 2S2 turboshaft engines, accomplish the TU166 modification in accordance with the instructions specified within Turbomeca Alert MSB No. A292 724166 Version A, dated March 23, 2012, when the GG Turbine is replaced or when the engine or Module M03 is going through overhaul or repair, or within 500 CIS after the effective date of this AD, whichever occurs first. (3) For Arriel 2C2 turboshaft engines, accomplish the TU166 modification in accordance with the instructions specified within Turbomeca Alert MSB No. A292 72 5166 Version A, dated June 18, 2012, when the GG Turbine is replaced or when the engine or Module M03 is going through overhaul or repair or within 650 engine hours after the effective date of this AD, whichever occurs first. (f) Credit for Actions Accomplished in Accordance With Previous Service Information (1) For Arriel 2B and 2B1 turboshaft engines, if you performed the TU166 modification before the effective date of this AD using Turbomeca Alert MSB No. A292 72 3166 Version A, dated August 17, 2010, you met the requirements of paragraph (e)(1) of this AD. (2) For Arriel 2C2 and 2S2 turboshaftengines, if you performed the TU166 modification before the effective date of this AD using Turbomeca Alert MSB No. A292 72 2166 Version A, dated March 30, 2009, Version B, dated September 4, 2009, Version C, dated June 15, 2010, Version D, dated July 28, 2010, Version E, dated October 4, 2010, Version F, dated May 13, 2011, or Version G, dated March 26, 2012, you met the requirements of paragraph (e)(2) or (e)(3) as applicable, of this AD. (g) Alternative Methods of Compliance (AMOCs) The Manager, Engine Certification Office, may approve AMOCs for this AD. Use the procedures found in 14 CFR 39.19 to make your request. (h) Related Information (1) For more information about this AD, contact Rose Len, Aerospace Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; phone: 781-238-7772; fax: 781-238-7199; email: rose.len@faa.gov. (2) European Aviation Safety Agency AD 2012-0054, dated April2, 2012, and AD 2012-0124, dated July 9, 2012, also pertain to this AD. (i) Material Incorporated by Reference (1) The Director of the Federal Register approved the incorporation by reference (IBR) of the service information listed in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51. (2) You must use this service information as applicable to do the actions required by this AD, unless the AD specifies otherwise. (3) The following service information was approved for IBR on October 24, 2012. (i) Turbomeca Alert Mandatory Service Bulletin No. A292 72 4166 Version A, dated March 23, 2012. (ii) Turbomeca Alert Mandatory Service Bulletin No. A292 72 5166 Version A, dated June 18, 2012. (4) The following service information was approved for IBR on August 12, 2011 (76 FR 40222, July 8, 2011). (i) Turbomeca Alert Mandatory Service Bulletin (MSB) No. A292 72 3166 Version B, dated September 20, 2010. (ii) Reserved. (5) For Turbomeca service information identified in this AD, contact Turbomeca, 40220 Tarnos, France; phone: 33 (0)5 59 74 40 00; telex: 570 042; fax: 33 (0)5 59 74 45 15. (6) You may view this service information at FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA. For information on the availability of this material at the FAA, call 781-238-7125. (7) You may view this service information at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html.