2025-05-02: Engine (Turbine/Turboprop)

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: 2025-05-02 General Electric Company: Amendment 39-22974; Docket No. FAA-2024-2540; Project Identifier AD-2024-00343-E. (a) Effective Date This airworthiness directive (AD) is effective April 8, 2025. (b) Affected ADs None. (c) Applicability This AD applies to General Electric Company (GE) Model CT7-5A2, CT7-5A3, CT7-7A, CT7-7A1, CT7-9B, CT7-9B1, CT7-9B2, CT7-9C, CT7-9C3, CT7-9D, and CT7-9D2 engines with an installed stage 1 turbine forward cooling plate having part number (P/N) 6064T08P01; or with an installed stage 2 turbine aft cooling plate having P/N 6064T07P05 or P/N 6068T36P01. (d) Subject Joint Aircraft System Component (JASC) Code 7200, Engine (Turbine/Turboprop). (e) Unsafe Condition This AD was prompted by the manufacturer's determination that certain GE Model CT7 fleets have affected cooling plates installed that do not meet lifing guidelines. The FAA is issuing this AD to prevent the failure of the stage 1 turbine forward cooling plate and stage 2 turbine aft cooling plate. The unsafe condition, if not addressed, could result in uncontained engine failure and damage to the airplane. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Required Actions Within the compliance times specified in paragraphs (g)(1) through (3) of this AD, replace the affected stage 1 turbine forward cooling plate or stage 2 turbine aft cooling plate, as applicable, with a replacement P/N eligible for installation, in accordance with table 1 to the introductory text of paragraph (g) of this AD: Table 1 to the Introductory Text of Paragraph (g) -Cooling Plate Replacement P/Ns Engine group Part name Affected P/N Replacement P/N 1 Stage 1 turbine forward cooling plate 6064T08P01 6064T08P04. 1 Stage 2 turbine aft cooling plate 6064T07P05 6064T07P07. 1 Stage 2 turbine aft cooling plate 6068T36P01 6068T36P04. 2 Stage 1 turbine forward cooling plate 6064T08P01 6064T08P03 or 6064T08P04. 2 Stage 2 turbine aft cooling plate 6064T07P05 6064T07P07. 2 Stage 2 turbine aft cooling plate 6068T36P01 6068T36P04. (1) For Group 1 engines with an affected part installed, replace the affected part at the next exposure of the gas generator stator assembly that occurs after the effective date of this AD. (2) For Group 2 engines with an affected part installed having 7,000 part cycles since new (PCSN) or less as of the effective date of this AD, replace the affected part at the next exposure of the gas generator stator assembly or within 2,000 flight cycles (FCs) but before reaching 7,500 PCSN, whichever occurs first after the effective date of this AD. (3) For Group 2 engines with an affected part installed having more than 7,000 PCSN as of the effective date of this AD, replace the affected part at the next exposure of the gas generator stator assembly or within 500 FCs, whichever occurs first after the effective date of this AD. (h) Definitions For the purpose of this AD: (1) "Group 1 engines" are GE Model CT7-5A2, CT7-5A3, CT7-9B, CT7-9B1, CT7-9B2, CT7-9D, and CT7-9D2 engines. (2) "Group 2 engines" are GE Model CT7-7A, CT7-7A1, CT7-9C, and CT7-9C3 engines. (3) "Exposure of the gas generator stator assembly" is when the gas generator rotor and stator assembly are separated from the combustor module. (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 Sungmo Cho, Aviation Safety Engineer, FAA, 2200 South 216th Street, Des Moines, WA 98198; phone: (781) 238-7241; email: sungmo.d.cho@faa.gov. (k) Material Incorporated by Reference None. Issued on February 25, 2025. Victor Wicklund, Deputy Director, Compliance & Airworthiness Division, Aircraft Certification Service. [FR Doc. 2025-03383 Filed 3-3-25; 8:45 am]BILLING CODE 4910-13-P