Airworthiness directives › 2024-07-02
AD 2024-07-02 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 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.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
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.
Unsafe condition
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. The FAA is issuing this AD to prevent failure of the HPT rotor interstage seal. The unsafe condition, if not addressed, could result in release of uncontained debris, damage to the engine, and damage to the airplane.
Affected ADs
None.
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