AD 94-07-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | General Electric Company | CT58-110-1 | GENERAL ELECTRIC COMPANY Models CT58-110 and -140 Series Engines |
| engine | General Electric Company | CT58-110-2 | GENERAL ELECTRIC COMPANY Models CT58-110 and -140 Series Engines |
| engine | General Electric Company | CT58-140-1 | GENERAL ELECTRIC COMPANY Models CT58-110 and -140 Series Engines |
| engine | General Electric Company | CT58-140-2 | GENERAL ELECTRIC COMPANY Models CT58-110 and -140 Series Engines |
Unsafe Condition
Uncontained engine failure and damage to the aircraft due to cracking or insufficient web thickness in stage 1 and stage 2 turbine wheels with specified part numbers.
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Required Actions
Inspect turbine wheels per GE SB A72-126 Rev 2, remove cracked or non-compliant wheels prior to further flight, replace with serviceable parts, and mark compliant wheels with 'CEB 206, REV 2'. Additional inspections required at intervals based on operation type (RHL/non-RHL) and part numbers.
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Compliance Time
Required as indicated, unless accomplished previously. Actions must be completed prior to August 1, 1994, or earlier compliance deadlines based on time since new (TSN), time in service (TIS), or engine shop visits as specified.
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Affected Aircraft
General Electric Company CT58-110-1, CT58-110-2, CT58-140-1, CT58-140-2 engines with turbine wheels having part numbers 4002T17P01, 4002T17P02, 4002T17P04, 4002T96P01, 4002T96P02, 4002T96P04, and others listed in paragraph (h). Installed on Boeing Vertol 107 series, Sikorsky S61/S62 series aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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