2013-22-22: Hydromechanical metering unit (HMU)

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) 2013-01-07, Amendment 39-17321 (78 FR 6725, January 31, 2013), and adding the following new AD: 2013-22-22 Turbomeca S.A.: Amendment 39-17654; Docket No. FAA-2012- 0940; Directorate Identifier 2012-NE-26-AD. (a) Effective Date This AD is effective December 20, 2013. (b) Affected ADs This AD supersedes AD 2013-01-07, Amendment 39-17321 (78 FR 6725, January 31, 2013). (c) Applicability This AD applies to all Turbomeca S.A. Arriel 2D turboshaft engines. (d) Unsafe Condition This AD was prompted by further cases of deterioration of hydromechanical metering unit (HMU) rotating components. We are issuing this AD to prevent an uncommanded in-flight shutdown of the engine and possible loss of the helicopter. (e) Compliance Comply with this AD within the compliance times specified, unless already done. (1) Replace inter-pump complete sleeve, and visually inspect the complete sleeve female splines and HMU high-pressure (HP) pump and low-pressure (LP) pump male splines for corrosion, scaling, cracks, and wear, at the following: (i) Before exceeding 400 HMU operating hours since new if the HMU has 375 or fewer operating hours on the effective date of this AD; or (ii) Within 25 HMU operating hours if the HMU has more than 375 operating hours on the effective date of this AD. (iii) Thereafter, at intervals not to exceed 400 HMU operating hours. (iv) Guidance on replacing the complete sleeve and inspecting the complete sleeve female splines, and HP and LP male splines, can be found in Turbomeca Technical Instruction No. 292 73 2847. (v) If the HMU does not pass the initial or repetitive visual inspections required by paragraph (e)(1) of this AD, then before the next flight, replace the affected HMU with an HMU eligible for installation. (2) Replace the rotating components of the HP and LP pumps, including the complete sleeve, or replace the HMU with an HMU eligible for installation at the following: (i) Before exceeding 800 HMU operating hours since new; or (ii) Within 800 HMU operating hours since last replacement of LP and HP fuel pumps rotating components; whichever occurs later. (iii) Thereafter, replace the LP and HP fuel pump rotating components or the HMU within every 800 HMU operating hours. (iv) Guidance for completing the requirements of paragraph (e)(2) can be found in Turbomeca S.A. Alert Mandatory Service Bulletin (MSB) No. A292 73 2847. (f) Credit for Previous Actions If before the effective date of this AD, you complied with Turbomeca S.A. Alert MSB No. A292 73 2847, Version A, dated May 29, 2012, you met the initial replacement requirements specified in paragraph (e) of this AD. However, you must still comply with the repetitive inspection requirements of this AD. (g) Installation Prohibition After the effective date of this AD, do not install any HMU onto any engine, or install any engine onto any helicopter, unless the HMU is in compliance with this AD. (h) 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. (i) Related Information (1) For more information about this AD, contact Frederick Zink, Aerospace Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; phone: 781-238-7779; fax: 781-238-7199; email: [email protected]. (2) Refer to MCAI European Aviation Safety Agency AD 2013-0079, dated March 22, 2013, for more information. You may examine the AD on the Internet at http://www.regulations.gov/#!documentDetail;D=FAA-2012-0940-0006. (3) Turbomeca S.A. Alert MSB No. A292 73 2847, Turbomeca Technical Instruction No. 292 73 2847, and Turbomeca Maintenance Manual Task 73-23-00-802-A01, which are [[Page 68699]] not incorporated by reference in this AD, pertain to the subject of this AD and can be obtained from Turbomeca, using the contact information in paragraph (i)(4) of this AD. (4) 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. (j) Material Incorporated by Reference None.