Airworthiness Directive · Amendment 39-22534 · Turbine engine compressor section
General Electric Company Engines
This AD applies to General Electric Company (GE) Model GEnx-1B64/P2, GEnx-1B67/P2, GEnx-1B70/75/P2, GEnx-1B70/P2, GEnx-1B70C/P2, GEnx-1B74/75/P2, GEnx-1B76/P2, GEnx-1B76A/P2, and GEnx-2B67/P engines with an installed:
(1) Stages 6-10 compressor rotor 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 72-0515, R00, dated January 31, 2023 (GEnx-1B 72-0515 R00); or
(2) Forward seal having a P/N and S/N listed in paragraph 4, Appendix—A, Table 2 of GEnx-1B 72-0515 R00; or
(3) Stages 6-10 compressor rotor spool having a P/N and S/N listed in paragraph 4, Appendix—A, Table 1 of GE GEnx-2B Service Bulletin 72-0452, R00, dated January 31, 2023. (GEnx-2B 72-0452 R00); or
(4) Forward seal having a P/N and S/N listed in paragraph 4, Appendix—A, Table 2 of GEnx-2B 72-0452 R00.
The FAA is adopting a new airworthiness directive (AD) for certain General Electric Company (GE) Model GEnx-1B and GEnx-2B engines. This AD was prompted by a manufacturer investigation that revealed that certain stages 6-10 compressor rotor spools and forward seals were manufactured from powder metal material suspected to contain iron inclusion. This AD requires the replacement of the affected stages 6-10 compressor rotor spools and forward seals. The FAA is issuing this AD to address the unsafe condition on these products.
(1) For affected Model GEnx-1B engines, at the next piece-part exposure after the effective date of this AD, or before the affected stages 6-10 compressor rotor spool reaches the cyclic removal threshold listed in paragraph 4., Appendix—A, Table 1 of GEnx-1B 72-0515 R00, whichever occurs first, remove the affected stages 6-10 compressor rotor spool from service and replace with a part eligible for installation.
(2) For affected Model GEnx-1B engines, at the next piece-part exposure after the effective date of this AD, or before the affected forward seal exceeds the cyclic removal threshold listed in paragraph 4., Appendix—A, Table 2 of GEnx-1B 72-0515 R00, whichever occurs first, remove the affected forward seal from service and replace with a part eligible for installation.
(3) For affected Model GEnx-2B engines, at the next piece-part exposure after the effective date of this AD, or before the affected stages 6-10 compressor rotor spool exceeds the cyclic removal threshold listed in paragraph 4., Appendix—A, Table 1 of GEnx-2B 72-0452 R00, whichever occurs first, remove the affected stages 6-10 compressor rotor spool from service and replace with a part eligible for installation.
(4) For affected Model GEnx-2B engines, at the next piece-part exposure after the effective date of this AD, or before the affected forward seal exceeds the cyclic removal threshold listed in paragraph 4., Appendix—A, Table 2 of GEnx-2B 72-0452 R00, whichever occurs first, remove the affected forward seal from service and replace with a part eligible for installation.
(1) For the purpose of this AD, a “part eligible for installation” is any stages 6-10 compressor rotor spool or forward seal with a P/N and S/N not listed in paragraph 4, Appendix—A, Table 1 or paragraph 4, Appendix—A, Table 2 of GEnx-1B 72-0515 R00 or GEnx-2B 72-0452 R00.
(2) For the purpose of this AD, “piece-part exposure” is when the affected part is removed from the engine.
