AD 81-02-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | General Electric Company | CT58-100-2 | GENERAL ELECTRIC COMPANY Model CT58 Engines |
| engine | General Electric Company | CT58-110-1 | GENERAL ELECTRIC COMPANY Model CT58 Engines |
| engine | General Electric Company | CT58-110-2 | GENERAL ELECTRIC COMPANY Model CT58 Engines |
| engine | General Electric Company | CT58-140-1 | GENERAL ELECTRIC COMPANY Model CT58 Engines |
| engine | General Electric Company | CT58-140-2 | GENERAL ELECTRIC COMPANY Model CT58 Engines |
Unsafe Condition
Failure of stage one turbine wheels due to cracks originating from undersize rabbet groove radii.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect forward and aft rabbet groove radii in accordance with General Electric Alert Service Bulletin CT58 (A72-159) CEB-255 or equivalent. Replace turbine wheels with radii less than 0.010 inch prior to further flight.
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Compliance Time
Within the next 50 hours or 100 cycles, whichever comes first, for turbine wheels with 3,950 hours or 7,900 cycles or more on the effective date. Prior to exceeding 4,000 hours or 8,000 cycles, whichever comes first, for those with less than 3,950 hours or 7,900 cycles on the effective date.
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Affected Aircraft
General Electric Company CT58-100-2, CT58-110-1, CT58-110-2, CT58-140-1, CT58-140-2 engines with stage one turbine wheel part number 4002T17P02 and specific serial numbers listed in the AD.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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