2025-07-10: Fuel Controlling System

1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. § 39.13 [Amended] 2. The FAA amends § 39.13 by: a. Removing Airworthiness Directive 2020-20-17, Amendment 39-21273 (85 FR 63443, October 8, 2020); and Airworthiness Directive 2021-15-05, Amendment 39-21652 (86 FR 43409, August 9, 2021); and b. Adding the following new airworthiness directive: 2025-07-10 General Electric Company: Amendment 39-23012; Docket No. FAA-2024-2417; Project Identifier AD-2024-00336-E. (a) Effective Date This airworthiness directive (AD) is effectiveMay 21, 2025. (b) Affected ADs (1) This AD replaces AD 2020-20-17, Amendment 39-21273 (85 FR 63443, October 8, 2020) (AD 2020-20-17). (2) This AD replaces AD 2021-15-05, Amendment 39-21652 (86 FR 43409, August 9, 2021) (AD 2021-15-05). (c) Applicability This AD applies to General Electric Company (GE) Model GE90-110B1 and GE90-115B engines. (d) Subject Joint Aircraft System Component (JASC) Code 7320, Fuel Controlling System. (e) Unsafe Condition This AD was prompted by an in-service occurrence of loss of engine thrust control resulting in uncommanded high thrust. The FAA is issuing this AD to prohibit dispatch of the airplane when certain faults caused by degradation of the MN4 integrated circuit in the full authority digital engine control (FADEC) are displayed and certain FADEC conditions are present, and to prevent failure of the electronic engine control (EEC) FADEC integrated circuit (MN4) microprocessor solder ball. The unsafe condition, if not addressed, could result in loss of engine thrust control and reduced control of the airplane. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Retained Actions From AD 2020-20-17, With No Changes (1) After October 23, 2020 (the effective date of AD 2020-20-17), notwithstanding the provisions of the operator's minimum equipment list (MEL), dispatch of an airplane is prohibited if the engine indicating and crew alerting system (EICAS) displays the status message "ENG EEC C1 L" or "ENG EEC C1 R" and any condition is present that is listed in the Accomplishment Instructions, paragraphs 3.A.(2)(f), 3.A.3(a), or 3.A.(4) of GE GE90-100 Service Bulletin 73-0117 R01, dated August 5, 2020. (2) As terminating action for the requirements of paragraph (g)(1) of this AD, within 120 days of October 23, 2020 (the effective date of AD 2020-20-17), revise the existing FAA-approved MEL by incorporating into the MEL the dispatch restrictions listed in paragraph (g)(1) of this AD as a required operation or maintenance procedure. Specific alternative MEL wording to accomplish the actions specified in paragraph (g)(1) of this AD can be approved by the operator's principal operations or maintenance inspector. (h) Retained Actions From AD 2021-15-05, With No Changes (1) Within the following compliance times after September 13, 2021 (the effective date of AD 2021-15-05), replace the FADEC MN4 microprocessor using an approved overhaul procedure: (i) For a FADEC MN4 microprocessor with 10,500 or more cycles since new (CSN), replace the FADEC MN4 microprocessor before accumulating 500 additional cycles on the FADEC MN4 microprocessor. (ii) For a FADEC MN4 microprocessor with 5,000 CSN or more, but fewer than 10,500 CSN, replace the FADEC MN4 microprocessor at the next FADEC component shop visit or before accumulating 11,000 CSN on the FADEC MN4 microprocessor, whichever occurs first. (2) Thereafter, repeat the replacement of the FADEC MN4 microprocessor at the first FADEC component shop visit after accumulating 5,000 cycles since the last replacement but before accumulating 11,000 cycles since the last replacement. (i) Retained Definitions From AD 2021-15-05, With an Updated Definition This paragraph restates the definitions of paragraph (h) of AD 2021-15-05, with new service information included for the definition of paragraph (h)(1)(ii). For the purpose of this AD: (1) An "approved overhaul procedure" is one of the following: (i) Replacement of the FADEC MN4 microprocessor using FADEC International-approved maintenance procedures; or (ii) Replacement of the FADEC MN4 microprocessor using the Accomplishment Instructions, paragraph 3.A., of GE GE90-100 Service Bulletin 73-0118, Revision 01, dated April 27, 2021, or of GE GE90-100 Service Bulletin 73-0118, Revision 02, dated November 15, 2024. (2) A "FADEC component shop visit" is the induction of the FADEC into a repair facility to perform internal maintenance on the FADEC. (j) New Required Actions Within 180 days after the effective date of this AD, replace any EEC FADEC software version that is earlier than A.0.8.6 (prior to GE GE90-100 Service Bulletin 73-0122) with an EEC FADEC software version that is eligible for installation. (k) Terminating Action The actions specified in paragraph (j) of this AD constitute terminating action for all the requirements of paragraphs (g) and (h) of this AD. (l) Installation Prohibition As of the effective date of this AD, no person may install on any engine, an EEC FADEC software version that is earlier than A.0.8.6 (prior to GE GE90-100 Service Bulletin 73-0122). (m) Definition For the purpose of this AD, an "EEC FADEC software version that is eligible for installation" is any software version that is A.0.8.6 or later. (n) Alternative Methods of Compliance (AMOCs) (1) The Manager, AIR-520 Continued Operational Safety 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 AIR-520 Continued Operational Safety Branch, send it to the attention of the person identified in paragraph (o) of this AD and email to: AMOC@faa.gov . (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. (3) AMOCs approved previously for AD 2021-15-05 are approved as AMOCs for the corresponding provisions of this AD. (o) Additional Information For more information about this AD, contact Alexander Thickstun, Aviation Safety Engineer, FAA, 2200 South 216th Street, Des Moines, WA 98198; phone: (202) 267-8292; email: alexander.m.thickstun@faa.gov . (p) Material Incorporated by Reference (1) The Director of the Federal Register approved the incorporation by reference (IBR) of the material listed in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51. (2) You must use this material as applicable to do the actions required by this AD, unless the AD specifies otherwise. (3) The following material was approved for IBR on May 21, 2025. (i) General Electric Company (GE) GE90-100 Service Bulletin 73-0118, Revision 02, dated November 15, 2024. (ii) [Reserved] (4) The following material was approved for IBR on October 23, 2020 (85 FR 63443, October 8, 2020). (i) GE GE90-100 Service Bulletin 73-0117 R01, dated August 5, 2020. (ii) [Reserved] (5) The following material was approved for IBR on September 13, 2021 (86 FR 43409, August 9, 2021). (i) GE GE90-100 Service Bulletin 73-0118, Revision 01, dated April 27, 2021. (ii) [Reserved] (6) For GE material identified in this AD, contact GE, 1 Neumann Way, Cincinnati, OH 45215; phone: (513) 552-3272; email: aviation.fleetsupport@ge.com; website: ge.com . (7) You may view this material at the FAA, Airworthiness Products Section, Operational Safety Branch, 1200 District Avenue, Burlington, MA 01803. For information on the availability of this material at the FAA, call (817) 222-5110. (8) You may view this material at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, visit www.archives.gov/federal-register/cfr/ibr-locations or email fr.inspection@nara.gov. Issued on April 2, 2025. Peter A. White, Deputy Director, Integrated Certificate Management Division, Aircraft Certification Service. [FR Doc. 2025-06420 Filed 4-15-25; 8:45 am]BILLING CODE 4910-13-P