Airworthiness directives › 2024-25-07
AD 2024-25-07 Airworthiness Directives; General Electric Company Engines
Applicability*9
This AD applies to General Electric Company (GE) Model GEnx-1B64, GEnx-1B64/P1, GEnx-1B64/P2, GEnx-1B67, GEnx-1B67/P1, GEnx-1B67/P2, GEnx-1B70, GEnx-1B70/75/P1, GEnx-1B70/75/P2, GEnx-1B70/P1, GEnx-1B70/P2, GEnx-1B70C/P1, GEnx-1B70C/P2, GEnx-1B74/75/P1, GEnx-1B74/75/P2, GEnx-1B76/P2, GEnx-1B76A/P2, GEnx-2B67, GEnx-2B67B, and GEnx-2B67/P engines with an installed: (1) Stages 6-10 compressor rotor spool (stages 6-10 spool) having a part number (P/N) and serial number (S/N) listed in paragraph 4, Appendix—A, Table 1 of GE GEnx-1B Service Bulletin 72-0525, R01, dated June 10, 2024 (GEnx-1B SB 72-0525, R01); or (2) Stages 6-10 spool having a P/N and S/N listed in paragraph 4, Appendix—A, Table 1 of GE GEnx-2B Service Bulletin 72-0460, R01, dated June 10, 2024 (GEnx-2B SB 72-0460, R01).
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
At the next piece-part exposure after the effective date of this AD or before the affected stages 6-10 spool reaches the cyclic removal threshold specified in paragraph 4., Appendix—A, Table 1 of GEnx-1B 72-0525, R01 or GEnx-2B SB 72-0460, R01, as applicable, whichever occurs first, do the following actions: (1) Inspect the stages 6-10 spool for previously accomplished blend repairs in accordance with the Accomplishment Instructions, paragraph 3.B.(1) of GEnx-1B SB 72-0525, R01 or GEnx-2B SB 72-0460, R01, as applicable. (2) If during any inspection required by paragraph (g)(1) of this AD, any stages 6-10 spool is found to have a previously accomplished blend repair, before further flight, inspect the blend repair for compliance with the allowable limits in accordance with the Accomplishment Instructions, paragraph 3.B.(2) of GEnx-1B SB 72-0525, R01 or GEnx-2B SB 72-0460, R01, as applicable. (3) If during any inspection required by paragraph (g)(2) of this AD, any stages 6-10 spool is found to have a previously accomplished blend repair that is not within the allowable limits, before further flight, remove the stages 6-10 spool from service and replace with a part eligible for installation in accordance with the Accomplishment Instructions, paragraph 3.B.(2)(a)1 or 3.B.(2)(b)1 of GEnx-1B SB 72-0525, R01 or GEnx-2B SB 72-0460, R01, as applicable.
Unsafe condition
This AD was prompted by a manufacturer evaluation which determined that a lower life limit may be necessary for certain stages 6-10 spools than that allowed in the engine shop manual. The FAA is issuing this AD to prevent fracture and potential uncontained failure of the stages 6-10 spools. The unsafe condition, if not addressed, could result in uncontained debris release, damage to the engine, and damage to the aircraft.
Affected ADs
None.
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