Airworthiness directives › 2025-04-12
AD 2025-04-12 Airworthiness Directives; CFM International, S.A. Engines
Applicability*9
This AD applies to the following CFM International, S.A. (CFM) Model engines: (1) LEAP-1A23, LEAP-1A24, LEAP-1A24E1, LEAP-1A26, LEAP-1A26CJ, LEAP-1A26E1, LEAP-1A29, LEAP-1A29CJ, LEAP-1A30, LEAP-1A32, LEAP-1A33, LEAP-1A33B2, LEAP-1A35A; (2) LEAP-1B21, LEAP-1B23, LEAP-1B25, LEAP-1B27, LEAP-1B28, LEAP-1B28B1, LEAP-1B28B2, LEAP-1B28B2C, LEAP-1B28B3, LEAP-1B28BBJ1, LEAP-1B28BBJ2; and (3) LEAP-1C28, LEAP-1C30, and LEAP-1C30B1.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) For LEAP-1A engines with an installed LPT stage 5 disk having a part number (P/N) and serial number (S/N) listed in Table 1, Table 2, or Table 3 of CFM Service Bulletin (SB) LEAP-1A-72-00-0519-01A-930A-D, Issue 001-00, dated September 18, 2024 (CFM SB LEAP-1A-72-00-0519-01A-930A-D): At the next piece-part exposure of the LPT stage 5 disk, or before exceeding the applicable cycles since new (CSN) threshold identified in Table 1, Table 2, or Table 3 of CFM SB LEAP-1A-72-00-0519-01A-930A-D, whichever occurs first after the effective date of this AD, remove the LPT stage 5 disk from service and replace with a part eligible for installation. (2) For LEAP-1B engines with an installed LPT stage 4 disk having a P/N and S/N listed in Table 1 of CFM SB LEAP-1B-72-00-0419-01A-930A-D, Issue 001-00, dated September 18, 2024 (CFM SB LEAP-1B-72-00-0419-01A-930A-D): At the next piece-part exposure of the LPT stage 4 disk, or before exceeding the applicable CSN threshold identified in Table 1 of CFM SB LEAP-1B-72-00-0419-01A-930A-D, whichever occurs first after the effective date of this AD, remove the LPT stage 4 disk from service and replace with a part eligible for installation. (3) For LEAP-1B engines with an installed LPT stage 5 disk having a P/N and S/N listed in Table 2 or Table 3 of CFM SB LEAP-1B-72-00-0419-01A-930A-D: At the next piece-part exposure of the LPT stage 5 disk, or before exceeding the applicable CSN threshold identified in Table 2 or Table 3 of CFM SB LEAP-1B-72-00-0419-01A-930A-D, whichever occurs first after the effective date of this AD, remove the LPT stage 5 disk from service and replace with a part eligible for installation.
Unsafe condition
This AD was prompted by a manufacturer investigation that revealed a quality escape for certain low-pressure turbine (LPT) disks made from forgings with nonconforming grain size. The FAA is issuing this AD to prevent the fracture and uncontained failure of certain LPT stage 4 and stage 5 disks. The unsafe condition, if not addressed, could result in uncontained part release, damage to the engine, and damage to the airplane.
Affected ADs
None.
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