Airworthiness Directive · Amendment 39-22722 · Turbine section
CFM International, S.A. Engines
This AD applies to CFM International, S.A. (CFM) Model LEAP-1A23, LEAP-1A24, LEAP-1A24E1, LEAP-1A26, LEAP-1A26CJ, LEAP-1A26E1, LEAP-1A29, LEAP-1A29CJ, LEAP-1A30, LEAP-1A32, LEAP-1A33, LEAP-1A33B2, and LEAP-1A35A engines.
The FAA is adopting a new airworthiness directive (AD) for CFM International, S.A. (CFM) Model LEAP-1A23, LEAP-1A24, LEAP-1A24E1, LEAP-1A26, LEAP-1A26CJ, LEAP-1A26E1, LEAP-1A29, LEAP-1A29CJ, LEAP-1A30, LEAP-1A32, LEAP-1A33, LEAP-1A33B2, and LEAP-1A35A engines. This AD was prompted by detection of melt-related freckles in the billet, which may reduce the life of certain high-pressure turbine (HPT) rotor interstage seals. This AD requires removing the affected HPT rotor interstage seals from service and replacing with a part eligible for installation. The FAA is issuing this AD to address the unsafe condition on these products.
For engines with an affected HPT rotor interstage seal installed, before exceeding the applicable threshold specified in Table 1 of paragraph 3.E., Compliance, of CFM Service Bulletin (SB) LEAP-1A-72-00-0492-01A-930A-D, Issue 001-00, dated April 6, 2023 (CFM SB LEAP-1A-72-00-0492-01A-930A-D, Issue 001-00), or at the next HPT rotor module exposure, whichever occurs first after the effective date of this AD, remove the affected HPT rotor interstage seal from service and replace it with a part eligible for installation.
(1) For the purpose of this AD, an “affected HPT rotor interstage seal” is any HPT rotor interstage seal having part number 2466M68P02 and a serial number listed in Table 1 of paragraph 3.E., Compliance, of CFM SB LEAP-1A-72-00-0492-01A-930A-D, Issue 001-00.
(2) For the purpose of this AD, a “part eligible for installation” is any HPT rotor interstage seal having a serial number that is not listed in Table 1 of paragraph 3.E., Compliance, of CFM SB LEAP-1A-72-00-0492-01A-930A-D, Issue 001-00.
(3) For the purpose of this AD, an “HPT rotor module exposure” is an engine shop visit during which the HPT rotor assembly is fully removed from the engine core.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
