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The Amendment \n\n\n\tAccordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows: \n\nPART 39--AIRWORTHINESS DIRECTIVES \n\n0 1. The authority citation for part 39 continues to read as follows: \n\n\n\tAuthority: 49 U.S.C. 106(g), 40113, 44701. \n\n\n\nSec. 39.13 (Amended) \n\n0 2. The FAA amends Sec. 39.13 by adding the following new airworthiness directive: \n\n2021-05-22 Safran Helicopter Engines, S.A. (Type Certificate previously held by Turbomeca, S.A.): Amendment 39-21466; Docket No. FAA-2021-0132; Project Identifier MCAI-2020-00947-E. \n\n(a) Effective Date \n\n\n\tThis airworthiness directive (AD) is effective March 22, 2021. \n\n(b) Affected ADs \n\n\n\tNone. \n\n(c) Applicability \n\n\n\tThis AD applies to Safran Helicopter Engines (Type Certificate previously held by Turbomeca, S.A.): \n\t(1) Arriel 1B, Arriel 1C, Arriel 1C2, and Arriel 1D1 model turboshaft engines with a Stage 2 HPT disk part number (P/N) 0292250400 and serial number (S/N) J915AD, J918AD, J919AD, J921AD, J923AD, J924AD, J926AD or J927AD, installed; and \n\t(2) Astazou XIV B and Astazou XIV H model turboshaft engines with a Stage 3 turbine wheel P/N 0256257050 and S/N J276AD, J278AD, J279AD, J281AD, J282AD, J283AD or J287AD, installed. \n\n(d) Subject \n\n\n\tJoint Aircraft System Component (JASC) Code 7250, Turbine Section. \n\n(e) Unsafe Condition \n\n\n\tThis AD was prompted by the detection of positive segregation (freckles) on Stage 2 high-pressure turbine (HPT) disks and Stage 3 turbine wheels manufactured from a certain block of material. The FAA is issuing this AD to prevent failure of the HPT disk. The unsafe condition, if not addressed, could result in failure of the Stage 2 HPT disk and Stage 3 turbine wheels, uncontained release of these parts, damage to the helicopter, and reduced control of the helicopter. \n\n(f) Compliance \n\n\n\tComply with this AD within the compliance times specified, unless already done. \n\n(g) RequiredActions \n\n\n\t(1) For affected Safran Helicopter Engines Arriel 1B, Arriel 1C, Arriel 1C2 and Arriel 1D1 model turboshaft engines, within 25 flight hours (FHs) after the effective date of this AD, remove from service the Stage 2 HPT disk and replace with a part that is eligible for installation. \n\t(2) For affected Safran Helicopter Engines Astazou XIV B and Astazou XIV H model turboshaft engines, within 25 FHs after the effective date of this AD, remove from service the Stage 3 turbine wheel and replace with a part that is eligible for installation. \n\n(h) Definitions \n\n\n\t(1) For the purpose of this AD, a part eligible for installation on Safran Helicopter Engines Arriel 1B, Arriel 1C, Arriel 1C2, and Arriel 1D1 model turboshaft engines is a Stage 2 HPT disk that does not have P/N 0292250400 and S/N J915AD, J918AD, J919AD, J921AD, J923AD, J924AD, J926AD or J927AD. \n\t(2) For the purpose of this AD, a part that is eligible for installation on Safran Helicopter Engines Astazou XIVB and Astazou XIV H model turboshaft engines is a Stage 3 turbine wheel that does not have P/N 0265257050 and S/N J276AD, J278AD, J279AD, J281AD, J282AD, J283AD, or J287AD. \n\n(i) Alternative Methods of Compliance (AMOCs) \n\n\n\t(1) The Manager, ECO Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the manager of the ECO Branch, send it to the attention of the person identified in Related Information. You may email your request to: ANE-AD-AMOC@faa.gov. \n\t(2) Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/certificate holding district office. \n\n(j) Related Information \n\n\n\t(1) For more information about this AD, contact WegoWang, Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: (781) 238-7134; fax: (781) 238-7199; email: wego.wang@faa.gov. \n\t(2) Refer to European Union Aviation Safety Agency (EASA) AD 2020-0151-E, dated July 9, 2020, and EASA AD 2020-0161-E, dated July 17, 2020, for more information. You may examine the EASA ADs in the AD docket at https://www.regulations.gov by searching for and locating Docket No. FAA-2021-0132. \n\n(k) Material Incorporated by Reference \n\n\n\tNone. \n\n\n\tIssued on February 26, 2021. Gaetano A. Sciortino, Deputy Director for Strategic Initiatives, Compliance & Airworthiness Division, Aircraft Certification Service. (FR Doc. 2021-04454 Filed 3-4-21; 8:45 am) BILLING CODE 4910-13-P
