AD 69-17-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | General Electric Company | T58-GE-5 | GENERAL ELECTRIC Models CT58-100-1, CT58-100-2, CT58-110-1, CT58-110-2, CT58-140-1, CT58-140-2; Military T58-GE-1 and T58-GE-5 Engines |
| engine | General Electric Company | T58-GE-1 | GENERAL ELECTRIC Models CT58-100-1, CT58-100-2, CT58-110-1, CT58-110-2, CT58-140-1, CT58-140-2; Military T58-GE-1 and T58-GE-5 Engines |
| engine | General Electric Company | CT58-100-2 | GENERAL ELECTRIC Models CT58-100-1, CT58-100-2, CT58-110-1, CT58-110-2, CT58-140-1, CT58-140-2; Military T58-GE-1 and T58-GE-5 Engines |
| engine | General Electric Company | CT58-110-1 | GENERAL ELECTRIC Models CT58-100-1, CT58-100-2, CT58-110-1, CT58-110-2, CT58-140-1, CT58-140-2; Military T58-GE-1 and T58-GE-5 Engines |
| engine | General Electric Company | CT58-110-2 | GENERAL ELECTRIC Models CT58-100-1, CT58-100-2, CT58-110-1, CT58-110-2, CT58-140-1, CT58-140-2; Military T58-GE-1 and T58-GE-5 Engines |
| engine | General Electric Company | CT58-140-1 | GENERAL ELECTRIC Models CT58-100-1, CT58-100-2, CT58-110-1, CT58-110-2, CT58-140-1, CT58-140-2; Military T58-GE-1 and T58-GE-5 Engines |
| engine | General Electric Company | CT58-140-2 | GENERAL ELECTRIC Models CT58-100-1, CT58-100-2, CT58-110-1, CT58-110-2, CT58-140-1, CT58-140-2; Military T58-GE-1 and T58-GE-5 Engines |
Unsafe Condition
Failures of first and second stage turbine rotor discs due to exceeding 10,100 cycles, which could result in engine failure.
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Required Actions
Remove from service General Electric part numbers 278D978P002, 278D979P002, 37D400498P101, 37D400499P101, 37D400010P101, 37D400004P102, 37D400227P101, 37D400228P102, 4002T96P01, and 4002T17P01 with more than 10,100 cycles at the time of receiving this directive.
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Compliance Time
before further flight unless already accomplished
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Affected Aircraft
General Electric Models CT58-100-1, CT58-100-2, CT58-110-1, CT58-110-2, CT58-140-1, CT58-140-2, T58-GE-1, and T58-GE-5 engines installed in Boeing Vertol 107 and Sikorsky S61 and S62 aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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