Airworthiness directives › 2025-10-11
AD 2025-10-11 Airworthiness Directives; General Electric Company Engines
Models named: CF6-80E1A2, CF6-80E1A3, CF6-80E1A4, CF6-80E1A4/B. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to General Electric Company (GE) Model CF6-80E1A2, CF6-80E1A3, CF6-80E1A4, and CF6-80E1A4/B engines with an installed high-pressure turbine (HPT) stage 1 disk or HPT stage 2 disk having a part number (P/N) and serial number (S/N) identified in table 1 to paragraph (c) of this AD. Table 1 to Paragraph ( c )—Affected HPT Stage 1 and HPT Stage 2 Disks Part name P/N S/N HPT stage 1 disk 1863M36G06 GWN0GP27. HPT stage 1 disk 1863M36G06 GWN0GPM8. HPT stage 1 disk 1863M36G06 GWN0GP26. HPT stage 1 disk 1863M36G06 TMT5SW61. HPT stage 1 disk 1863M36G06 TMT5SW59. HPT stage 1 disk 1863M36G06 TMT5SW64. HPT stage 1 disk 1863M36G06 TMT5SW82. HPT stage 1 disk 1863M36G06 GWN0GPMG. HPT stage 2 disk 1778M72P05 BTB77100. HPT stage 2 disk 1778M72P05 MUNLD123. HPT stage 2 disk 1778M72P05 MUNLD122. HPT stage 2 disk 1778M72P05 MUN5B794. HPT stage 2 disk 1778M72P05 BTB77102.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Before further flight after the effective date of this AD, remove any affected HPT stage 1 disk having P/N 1863M36G06 and S/N GWN0GP27 from service and replace with a part eligible for installation. (2) Before further flight after the effective date of this AD, remove any affected HPT stage 2 disk having P/N 1778M72P05 and S/N BTB77100 from service and replace with a part eligible for installation. (3) For affected HPT stage 1 disks identified in table 1 to paragraph (c) of this AD that are not included in paragraph (g)(1) of this AD, at the next piece part exposure or before the affected HPT stage 1 disk exceeds 8,600 cycles since new (CSN), whichever occurs first after the effective date of this AD, remove the affected HPT stage 1 disk from service and replace with a part eligible for installation. (4) For affected HPT stage 2 disks identified in table 1 to paragraph (c) of this AD that are not included in paragraph (g)(2) of this AD, at the next piece part exposure or before the affected HPT stage 2 disk exceeds 12,000 CSN, whichever occurs first after the effective date of this AD, remove the affected HPT stage 2 disk from service and replace with a part eligible for installation.
Unsafe condition
This AD was prompted by a manufacturer investigation that revealed certain HPT stage 1 and HPT stage 2 disks were subject to iron inclusion introduced during the manufacturing process. The FAA is issuing this AD to prevent fracture and potential uncontained failure of certain HPT stage 1 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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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1