Airworthiness directives › 2025-25-07
AD 2025-25-07 Airworthiness Directives; General Electric Company Engines
Applicability*9
This AD applies to the following General Electric Company (GE) Model engines: (1) GE90-90B and GE90-94B engines with a high pressure turbine (HPT) stage 1 disk having a part number and serial number identified in table 1 to paragraph (c) of this AD installed; and (2) GE90-110B1 and GE90-115B engines with an HPT stage 1 disk or HPT stage 2 disk having a part number and serial number identified in table 1 to paragraph (c) of this AD or Table 1 or Table 2 of GE GE90-100 Service Bulletin (SB) 72-0926, Revision 01, dated December 22, 2023 (GE GE90-100 SB 72-0926, Revision 01), installed. Table 1 to Paragraph ( c )—Affected HPT Stage 1 and 2 Disks Part name Part No. Serial No. HPT Stage 1 Disk 1847M95G01 GWN05K5J HPT Stage 1 Disk 1847M95G01 GWN05K5M HPT Stage 1 Disk 1847M95G01 GWN05NP6 HPT Stage 1 Disk 1865M13G08 GWN10N9A HPT Stage 1 Disk 1865M13G07 GWN0NJ92 HPT Stage 1 Disk 1865M13G07 GWN0NJ94 HPT Stage 1 Disk 1865M13G07 GWN0NK87 HPT Stage 1 Disk 1865M13G08 GWN0RJ4G HPT Stage 1 Disk 1865M13G08 GWN0WPEC HPT Stage 2 Disk 1865M14P04 TMT4RK67 HPT Stage 2 Disk 1865M14P04 TMT4RG10 HPT Stage 2 Disk 1865M14P04 TMT4RG11
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
At the applicable times specified in paragraphs (g)(1) through (3) of this AD, remove each affected HPT stage 1 disk and HPT stage 2 disk from service and replace with a part eligible for installation. (1) For HPT stage 1 disks and HPT stage 2 disks with a part number and serial number identified in table 1 to paragraph (c) of this AD, before further flight. (2) For HPT stage 1 disks with a part number and serial number identified in Table 1 of GE GE90-100 SB 72-0926, Revision 01, that are not identified in table 1 to paragraph (c) of this AD, at the next piece-part exposure or before exceeding 4,650 cycles since new (CSN), whichever occurs first. (3) For HPT stage 2 disks with a part number and serial number identified in Table 2 of GE GE90-100 SB 72-0926, Revision 01, that are not identified in table 1 to paragraph (c) of this AD, at the next piece-part exposure or before exceeding 11,300 CSN, whichever occurs first.
Unsafe condition
This AD was prompted by a manufacturer investigation that revealed certain HPT stage 1 disks and HPT stage 2 disks were manufactured from powder metal material suspected to contain iron inclusion. The FAA is issuing this AD to prevent premature fracture and uncontained failure of the HPT stage 1 disks and HPT stage 2 disks. The unsafe condition, if not addressed, could result in uncontained debris release, damage to the engine, and damage to the airplane.
Affected ADs
None.
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