2026-17-03: Turbine Engine Compressor 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: 2026-17-03 International Aero Engines AG: Amendment 39-23446; Docket No. FAA-2025-2555; Project Identifier AD-2025-00433-E. (a) Effective Date This airworthiness directive (AD) is effective September 24, 2026. (b) Affected ADs None. (c) Applicability This AD applies to International Aero Engines AG (IAE AG) Model V2522-A5, V2524-A5, V2525-D5, V2527-A5, V2527E-A5, V2527M-A5, V2528-D5, V2530-A5, V2531-E5, and V2533-A5 engines with a 3rd stage high-pressure compressor (HPC) rotor blade having part number (P/N) 6A8353 or P/N 6A8688 installed. (d) Subject Joint Aircraft System Component (JASC) Code 7230, Turbine Engine Compressor Section. (e) Unsafe Condition This AD was prompted by multiple reports of failed 3rd stage HPC rotor blades that resulted in engine fires, unplanned engine removals, aborted takeoffs, and in-flight shutdowns (IFSD). The FAA is issuing this AD to prevent failure of the 3rd stage HPC rotor blades. The unsafe condition, if not addressed, could result in engine fire, reduced control of the airplane, and engine IFSD. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Required Actions At the next engine shop visit after the effective date of this AD where the 3rd stage HPC rotor blade is exposed, replace the full set of 3rd stage HPC rotor blades with parts eligible for installation. (h) Definitions (1) For the purpose of this AD, a "part eligible for installation" is: (i) A 3rd stage HPC rotor blade having P/N 6C8368, 6C8403, or later approved P/N; or (ii) A 3rd stage HPC rotor blade modified to P/N 6A8353-001 or P/N 6A8688-001. (2) For the purpose of this AD, a "3rd stage HPC rotor blade exposure" is when any 3rd stage HPC rotor blade is removed from the HPC stage 3 to 8 drum. (3) For the purpose of this AD, an "engine shop visit" is the induction of an engine into the shop for maintenance. (i) 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 (j) 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. (j) Additional Information For more information about this AD, contact Carol Nguyen, Aviation Safety Engineer, FAA, 2200 South 216th Street, Des Moines, WA 98198; phone: (781) 238-7655; email: carol.nguyen@faa.gov . (k) Material Incorporated by Reference None. Issued on September 4, 2026. Brian Knaup, Acting Deputy Director, Integrated Certificate Management Division, Aircraft Certification Service. [FR Doc. 2026-18423 Filed 9-9-26; 8:45 am]BILLING CODE 4910-13-P