2018-25-09: Engine Controls

Adoption of 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 (AD): \n\n2018-25-09 CFM International S.A.: Amendment 39-19520; Docket No. FAA-2018-1023; Product Identifier 2018-NE-37-AD. \n\n(a) Effective Date \n\n\n\tThis AD is effective December 26, 2018. \n\n(b) Affected ADs \n\n\n\tNone. \n\n(c) Applicability \n\n\n\tThis AD applies to all CFM International S.A. (CFM) LEAP-1B21, - 1B23, -1B25, -1B27, -1B28, -1B28B1, -1B28B2, -1B28B2C, -1B28B3, - 1B28BBJ1, and -1B28BBJ2 turbofan engines. \n\n(d) Subject \n\n\n\tJoint Aircraft System Component (JASC) Code 7600, Engine Controls. \n\n(e) Unsafe Condition \n\n\n\tThis AD was prompted by aborted takeoffs on the similarly designed CFM LEAP-1A model turbofan engine after those engines did not advance to the desired takeoff fan speed due to icing in the pressure sensor line. While we have not received any reports of aborted takeoffs with the CFM LEAP-1B model engine, the unsafe condition is likely to exist because of similarities in design and instances of ice and moisture found in the pressure sense subsystem lines. We are issuing this AD to prevent icing in the pressure sensor lines and inaccurate pressure sensor readings. The unsafe condition, if not addressed, could result in failure of one or \n\n((Page 63561)) \n\nmore engines, loss of thrust control, and loss of the airplane. \n\n(f) Compliance \n\n\n\tComply with this AD within the compliance times specified, unless already done. \n\n(g) Required Actions \n\n\n\t(1) Within 60 days after the effective date of this AD, remove electronic engine control (EEC) system operation (OPS) software, P/N 2628M86P10 or earlier; and engine health monitoring (EHM) software, P/N 2628M87P10 or earlier, from the engine and from service. \n\t(2) Before further flight after the removal of the EEC OPS and EHM software required by paragraph (g)(1) of this AD, install EEC OPS and EHM software that is eligible for installation. \n\n(h) Installation Prohibition \n\n\n\tAfter 60 days from the effective date of this AD, do not operate any engine identified in paragraph (c) of this AD with EEC OPS software, P/N 2628M86P10 or earlier, installed; or EHM software, P/N 2628M87P10 or earlier, installed. \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 certification office, send it to the attention of the person identified in paragraph (j) of this AD. You may email your request to: [email protected]. \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\tFor more information about this AD, contact Christopher McGuire, Aerospace Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: 781-238-7120; fax: 781-238-7199; email: [email protected]. \n\n(k) Material Incorporated by Reference \n\n\n\tNone.