Airworthiness directives › 2022-09-09
AD 2022-09-09 Airworthiness Directives; CFM International, S.A. Turbofan Engines
Applicability*9
This AD applies to CFM International, S.A. (CFM) 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 model turbofan engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within 60 days after the effective date of this AD, revise the airworthiness limitations section (ALS) of the applicable CFM LEAP-1A Engine Shop Manual (the ESM) and the operator's existing approved continuous airworthiness maintenance program (CAMP) by incorporating the following service information: (i) CFM High Pressure Compressor Rotor Life Limits LEAP 1A-05-11-02-01A-0B1B-C, Issue 010-00, dated September 15, 2021; and (ii) CFM High Pressure Turbine Rotor Life Limits LEAP 1A-05-11-03-01A-0B1B-C, Issue 007-00, dated September 15, 2021; and (iii) CFM Low Pressure Turbine Rotor Life Limits LEAP 1A-05-11-04-01A-0B1B-C, Issue 010-00, dated February 15, 2022. (2) Before the LPT stage 4 disk, part number (P/N) 362-039-520-0, with serial numbers identified in Figure 1 to paragraph (g)(2) of this AD (Figure 1) accumulates the cycles in Figure 1, or within 100 cycles after the effective date of this AD, whichever occurs later, remove the affected LPT stage 4 disk from service and replace with a part eligible for installation. Figure 1 to Paragraph (g) (2)—Life Limits for LPT Stage 4 Disks, P/N 362-039-520-0 LPT stage 4 disk serial No. Life limit for LEAP-1A23, -1A24, -1A24E1, -1A26, -1A26E1, -1A29, -1A30, -1A32, -1A33, -1A33B2, and -1A35A Life limit for LEAP-1A26CJ and -1A29CJ PC975638 PC975635. 2,500 cycles 1,400 cycles.
Unsafe condition
This AD was prompted by the detection of melt-related freckles in the billet, which may reduce the life of certain compressor rotor stages 6-10 spools, high pressure turbine (HPT) rotor interstage seals, HPT rotor stage 2 disks, low pressure turbine (LPT) stage 1 disks, LPT stage 2 disks, LPT stage 3 disks, and LPT stage 4 disks. The FAA is issuing this AD to prevent the failure of the high-pressure compressor, HPT rotor, and LPT rotor. 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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