Airworthiness directives › 2025-01-03
AD 2025-01-03 Airworthiness Directives; CFM International, S.A. Engines
Models named: LEAP-1A23, LEAP-1A24, LEAP-1A24E1, LEAP-1A26, LEAP-1A26CJ, LEAP-1A26E1, LEAP-1A29, LEAP-1A29CJ, LEAP-1A30, LEAP-1A32. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to the following CFM International, S.A. (CFM) engines: (1) 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. (2) Model LEAP-1C28, LEAP-1C30, and LEAP-1C30B1 engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) For LEAP-1A engines having an HPT rotor interstage seal installed with a part number (P/N) and serial number (S/N) listed in Table 1 of CFM Service Bulletin (SB) LEAP-1A-72-00-0525-01A-930A-D, Issue 002-00, dated June 28, 2024 (CFM SB LEAP-1A-72-00-0525-01A-930A-D Issue 002-00), at the next engine shop visit or before exceeding the applicable cyclic threshold in table 1 to paragraph (g)(1) of this AD, whichever occurs first after the effective date of this AD, remove the affected HPT rotor interstage seal from service and replace with a part eligible for installation. Table 1 to Paragraph ( g )(1)—Removal Thresholds for Each Engine Model Engine model Removal cyclic threshold LEAP-1A23, LEAP-1A24, LEAP-1A24E1, LEAP-1A26, LEAP-1A26E1, LEAP-1A29, LEAP-1A30, LEAP-1A32, LEAP-1A33, LEAP-1A33B2, and LEAP-1A35A 11,100 cycles since new (CSN) accumulated on the affected part. LEAP-1A26CJ and LEAP-1A29CJ 9,700 CSN accumulated on the affected part. (2) For LEAP-1A engines having an HPT rotor interstage seal installed with a P/N and S/N listed in Table 2 of CFM SB LEAP-1A-72-00-0525-01A-930A-D Issue 002-00, at the next piece part exposure or before exceeding the applicable cyclic threshold in table 1 to paragraph (g)(1) of this AD, whichever occurs first after the effective date of this AD, remove the affected HPT rotor interstage seal from service and replace with a part eligible for installation.
Unsafe condition
This AD was prompted by an investigation of an in-flight shut down event that revealed the aft arm of the high-pressure turbine (HPT) rotor interstage seal had failed. The FAA is issuing this AD to prevent failure of the HPT rotor interstage seal. The unsafe condition, if not addressed, could result in failure of one or more engines, loss of thrust control, and loss of the airplane.
Affected ADs
None.
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