2025-14-08: 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: a. Removing Airworthiness Directive AD 2023-23-12, Amendment 39-22614 (88 FR 85836, December 11, 2023); and b. Adding the following new airworthiness directive: 2025-14-08 CFM International, S.A.: Amendment 39-23086; Docket No. FAA-2025-0621; Project Identifier AD-2024-00796-E. (a) Effective Date This airworthiness directive (AD) is effective August 25, 2025. (b) Affected ADs This AD replaces AD 2023-23-12, Amendment 39-22614 (88 FR 85836, December 11, 2023) (AD 2023-23-12). (c) Applicability This AD applies to CFM International, S.A. (CFM) Model LEAP-1B21, LEAP-1B23, LEAP-1B25, LEAP-1B27, LEAP-1B28, LEAP-1B28B1, LEAP-1B28B2, LEAP-1B28B2C, LEAP-1B28B3, LEAP-1B28BBJ1, and LEAP-1B28BBJ2 engines. (d) Subject Joint Aircraft System Component (JASC) Code 7230, Turbine Engine Compressor Section; 7250, Turbine Section. (e) Unsafe Condition This AD was prompted by a manufacturer investigation that revealed that certain high-pressure turbine (HPT) rotor stage 1 disks and a certain compressor rotor stages 6-10 spool were manufactured from material suspected to have reduced material properties due to iron inclusion. The FAA is issuing this AD to prevent fracture and subsequent uncontained failure of certain HPT rotor stage 1 disks and a certain compressor rotor stages 6-10 spool. The unsafe condition, if not addressed, could result in uncontained debris release, damage to the engine, and damage to the aircraft. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Retained Required Actions (1) For engines with an installed HPT rotor stage 1 disk having a part number (P/N) and serial number (S/N) identified in Compliance, paragraph 3.E., Tables 1 through 2, of CFM Service Bulletin (SB) LEAP-1B-72-00-0392-01A-930A-D, Issue 002, dated September 5, 2023 (CFM SB LEAP-1B-72-00-0392-01A-930A-D, Issue 002): At the next piece-part exposure of the HPT rotor stage 1 disk, or before exceeding the applicable cycles since new (CSN) threshold identified in Compliance, paragraph 3.E., Tables 1 through 2, of CFM SB LEAP-1B-72-00-0392-01A-930A-D, Issue 002, whichever occurs first after January 16, 2024 (the effective date of AD 2023-23-12); or if the applicable CSN threshold has been exceeded as of January 16, 2024 (the effective date of AD 2023-23-12), within 50 flight cycles (FCs) from January 16, 2024 (the effective date of AD 2023-23-12); remove the HPT rotor stage 1 disk from service and replace with a part eligible for installation. (2) For engines with an installed compressor rotor stages 6-10 spool having a P/N and S/N identified in Compliance, paragraph 3.E., Table 3, of CFM SB LEAP-1B-72-00-0392-01A-930A-D, Issue 002: At the next piece-part exposure of the compressor rotor stages 6-10 spool, or before exceeding the applicable CSN threshold identified in Compliance, paragraph 3.E., Table 3, of CFM SB LEAP-1B-72-00-0392-01A-930A-D, Issue 002, whichever occurs first after January 16, 2024 (the effective date of AD 2023-23-12); or if the applicable CSN threshold has been exceeded as of January 16, 2024 (the effective date of AD 2023-23-12), within 50 FCs from January 16, 2024 (the effective date of AD 2023-23-12); remove the compressor rotor stages 6-10 spool from service and replace with a part eligible for installation. (h) New Required Actions For engines with an installed HPT rotor stage 1 disk having a P/N and S/N identified in Compliance, paragraph 3.E., Table 1, of CFM SB LEAP-1B-72-00-0402-01A-930A-D, Issue 001, dated January 23, 2024 (CFM SB LEAP-1B-72-00-0402-01A-930A-D, Issue 001): At the next piece-part exposure of the HPT rotor stage 1 disk, or before exceeding the applicable CSN threshold identified in Compliance, paragraph 3.E., Table 1, of CFM SB LEAP-1B-72-00-0402-01A-930A-D, Issue 001, whichever occurs first after the effective date of this AD; or if the applicable CSN threshold has been exceeded as of the effective date of this AD, within 50 FCs from the effective date of this AD; remove the HPT rotor stage 1 disk from service and replace with a part eligible for installation. (i) Retained Definition, With Updated Service Information Reference For the purpose of this AD, a "part eligible for installation" is an HPT rotor stage 1 disk or compressor rotor stages 6-10 spool that does not have a P/N and S/N identified in Compliance, paragraph 3.E., Tables 1 through 3, of CFM SB LEAP-1B-72-00-0392-01A-930A-D, Issue 002; or Compliance, paragraph 3.E., Table 1, of CFM SB LEAP-1B-72-00-0402-01A-930A-D, Issue 001. (j) Retained Installation Prohibition, With Updated Service Information Reference After the effective date of this AD, do not install an HPT rotor stage 1 disk or compressor rotor stages 6-10 spool that has a P/N and S/N identified in Compliance, paragraph 3.E., Tables 1 through 3, of CFM SB LEAP-1B-72-00-0392-01A-930A-D, Issue 002; or Compliance, paragraph 3.E., Table 1, of CFM SB LEAP-1B-72-00-0402-01A-930A-D, Issue 001, on any engine. (k) Retained Credit for Previous Actions This paragraph provides credit for the actions required by paragraph (g) of this AD, if those actions were performed prior to January 16, 2024 (the effective date of AD 2023-23-12) by following the Accomplishment Instructions specified in CFM SB LEAP-1B-72-00-0392-01A-930A-D, Issue 001, dated March 7, 2023. (l) 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 (m)(1) 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. (m) Additional Information (1) For more information about this AD, contact Mehdi Lamnyi, Aviation Safety Engineer, FAA, 2200 South 216th Street, Des Moines, WA 98198; phone: (781) 238-7743; email: mehdi.lamnyi@faa.gov. (2) Service material identified in this AD that is not incorporated by reference is available at the addresses specified in paragraph (n)(5) of this AD. (n) 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 [DATE 35 DAYS AFTER PUBLICATION OF THE FINAL RULE]. (i) CFM International, S.A. (CFM) Service Bulletin (SB) LEAP-1B-72-00-0402-01A-930A-D, Issue 001, dated January 23, 2024. (ii) [Reserved] (4) The following material was approved for IBR on January 16, 2024 (88 FR 85836, December 11, 2023). (i) CFM SB LEAP-1B-72-00-0392-01A-930A-D, Issue 002, dated September 5, 2023. (ii) [Reserved] (5) For CFM material identified in this AD, contact CFM International, S.A., GE Aviation Fleet Support, 1 Neumann Way, M/D Room 285, Cincinnati, OH 45215; phone: (877) 432-3272; email: aviation.fleetsupport@ge.com. (6) 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. (7) 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 July 9, 2025. Peter A. White, Deputy Director, Integrated Certificate Management Division, Aircraft Certification Service. [FR Doc. 2025-13660 Filed 7-18-25; 8:45 am]BILLING CODE 4910-13-P