2026-20-12: Turbine Section

1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. 2. The FAA amends § 39.13 by adding the following new airworthiness directive: 2026-20-12 Engine Alliance: Amendment 39-23485; Docket No. FAA-2026-11801; Project Identifier AD-2026-00946-E. (a) Effective Date This airworthiness directive (AD) is effective October 23, 2026. (b) Affected ADs None. (c) Applicability This AD applies to Engine Alliance (EA) Model GP7270, GP7272, and GP7277 engines, certificated in any category, having a high-pressure turbine (HPT) interstage seal serial number (S/N) specified in Appendix-A of EA Alert Service Bulletin EAGP7-A72-479, dated September 4, 2026 (EA ASB EAGP7-A72-479). (d) Subject Joint Aircraft System Component (JASC) Code 7250, Turbine Section. (e) Unsafe Condition This AD was prompted by a report of an aborted takeoff which resulted from an uncontained failure of the HPT interstage seal. The FAA is issuing this AD to prevent uncontained failure of the HPT interstage seal. The unsafe condition, if not addressed, could result in an engine fire and damage to the airplane. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Definition (1) An "affected part" is an HPT interstage seal having part number (P/N) 2047M99P02 and S/N listed in Appendix-A of EA ASB EAGP7-A72-479. (2) A "part eligible for installation" is any HPT interstage seal that is not an affected part. (h) Required Actions At the applicable times specified in paragraphs (h)(1), (2), and (3) of this AD, as applicable, remove the HPT interstage seal from service and replace with a part eligible for installation. (1) For HPT interstage seals specified in Table 1 of Appendix-A of EA ASB EAGP7-A72-479, within 50 flight cycles or within 30 days, whichever occurs first after the effective date of this AD. (2) For HPT interstage seals specified in Table 2 of Appendix-A of EA ASB EAGP7-A72-479, within 100 flight cycles or within 60 days, whichever occurs first after the effective date of this AD. (3) For HPT interstage seals specified in Table 3 of Appendix-A of EA ASB EAGP7-A72-479, within 150 flight cycles or within 90 days, whichever occurs first after the effective date of this AD. (i) No Reporting Requirement Although EA ASB EAGP7-A72-479 specifies to submit certain information to the manufacturer, this AD does not require that action. (j) 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 (k) of this AD and email to: [email protected] . (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. (k) Additional Information For more information about this AD, contact Molly Sturgis, Aviation Safety Engineer, FAA, 2200 South 216th Street, Des Moines, WA 98198; phone: (562) 627-5373; email: [email protected] . (l) 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. (i) Engine Alliance (EA) Alert Service Bulletin EAGP7-A72-479, dated September 4, 2026. (ii) [Reserved] (3) For EA material identified in this AD, contact Engine Alliance, 411 Silver Lane, East Hartford, CT 06118; phone: (800) 565-0140; email: [email protected]; website: engineallianceportal.com. (4) 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. (5) 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 [email protected] . Issued on October 6, 2026. Brian Knaup, Acting Deputy Director, Integrated Certificate Management Division, Aircraft Certification Service. [FR Doc. 2026-20666 Filed 10-6-26; 4:15 pm]BILLING CODE 4910-13-P