2017-14-08: Turbine Engine Compressor Section

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 adding the following new airworthiness directive (AD): 2017-14-08 CFM International S.A.: Amendment 39-18952; Docket No. FAA-2016-9592; Directorate Identifier 2016-NE-30-AD. (a) Effective Date This AD is effective August 18, 2017. (b) Affected ADs None. (c) Applicability This AD applies to CFM International S.A. (CFM) CFM56-3, -3B, and -3C turbofan engines with steel high-pressure compressor (HPC) stator case, part numbers (P/Ns)1499M30G01, 1499M30G02, 1499M30G03, or 1676M88G01, installed. (d) Subject Joint Aircraft System Component (JASC) Code 7230, Turbine Engine Compressor Section. (e) Unsafe Condition This AD was prompted by a report of dual engine loss of thrust control (LOTC) that resulted in an air turn back. We are issuing this AD to maintain the actuators ability to fully reach commanded position, and prevent LOTC and reduced control of the airplane. (f) Compliance Comply with this AD within the compliance times specified, unless already done. Within 12 months after the effective date of this AD: (1) Inspect the affected engines to determine if the compressor front stator case is marked with ``RP031'' adjacent to the part number. If the case is marked with ``RP031,'' no further action is required. If the case is not marked with ``RP031,'' follow the remaining steps in paragraph (f) of this AD. (2) Perform an initial pull force check of stage 1, stage 2, and stage 3 of the compressor variable stator vane (VSV) actuation system. (i) If any stage requires more than 100 lb force to move the actuation ring, reamthe VSV bores and apply anti-corrosion coating to stages 1, 2, and 3, prior to further flight, or replace with an HPC stator case that is eligible for installation and passes the VSV pull force check with measurements of 75 lb or less. (ii) If any stage requires more than 75 lb, but less than or equal to 100 lb force to move the actuation ring, repeat the inspection within 3 months since last inspection. (iii) If all stages require 75 lb force or less to move the actuation rings, repeat the inspection within 12 months since last inspection. (3) Thereafter, continue to perform repetitive pull force checks of stages 1, 2, and 3 of the compressor VSV actuation system and disposition as specified in paragraphs (2)(i) through (iii) of this AD. (g) Optional Terminating Action Reaming the VSV bores and applying anti-corrosion coating, as specified in paragraph [[Page 32450]] (f)(2)(i) of this AD, is terminating action to the repetitive inspections required by paragraph (f)(3) of this AD. (h) Alternative Methods of Compliance (AMOCs) The Manager, Engine Certification Office, FAA, may approve AMOCs for this AD. Use the procedures found in 14 CFR 39.19 to make your request. You may email your request to: ANE-AD-AMOC@faa.gov. (i) Related Information (1) For more information about this AD, contact David Bethka, Aerospace Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 1200 District Avenue, Burlington, MA 01803; phone: 781-238-7129; fax: 781-238-7199; email: david.bethka@faa.gov. (2) CFM Service Bulletin CFM56-3 S/B 72-1169, Revision 01, dated November 4, 2016; and CFM CFM56-3 Engine Shop Manual 72-32-01, Repair 031, dated December 15, 2016, can be obtained from CFM using the contact information in paragraph (i)(3) of this proposed AD. (3) For service information identified in this AD, contact CFM International Inc., Aviation Operations Center, 1 Neumann Way, M/D Room 285, Cincinnati, OH 45125; phone: 877-432-3272; fax: 877-432- 3329; email: aviation.fleetsupport@ge.com. (4) You may view this service information at the FAA, Engine & Propeller Directorate, 1200 District Avenue, Burlington, MA. For information on the availability of this material at the FAA, call 781-238-7125.