AD 90-23-15
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | General Electric Company | CF6-45A | GENERAL ELECTRIC COMPANY Models CF6-50/-45 Series Engines |
| engine | General Electric Company | CF6-45A2 | GENERAL ELECTRIC COMPANY Models CF6-50/-45 Series Engines |
| engine | General Electric Company | CF6-50A | GENERAL ELECTRIC COMPANY Models CF6-50/-45 Series Engines |
| engine | General Electric Company | CF6-50C | GENERAL ELECTRIC COMPANY Models CF6-50/-45 Series Engines |
| engine | General Electric Company | CF6-50C1 | GENERAL ELECTRIC COMPANY Models CF6-50/-45 Series Engines |
| engine | General Electric Company | CF6-50C2 | GENERAL ELECTRIC COMPANY Models CF6-50/-45 Series Engines |
| engine | General Electric Company | CF6-50C2B | GENERAL ELECTRIC COMPANY Models CF6-50/-45 Series Engines |
| engine | General Electric Company | CF6-50C2D | GENERAL ELECTRIC COMPANY Models CF6-50/-45 Series Engines |
| engine | General Electric Company | CF6-50CA | GENERAL ELECTRIC COMPANY Models CF6-50/-45 Series Engines |
| engine | General Electric Company | CF6-50E | GENERAL ELECTRIC COMPANY Models CF6-50/-45 Series Engines |
Unsafe Condition
Turbine mid-frame (TMF) cracks can cause the release of hot gas, increased nacelle temperature, activation of the fire warning system, and an inflight shutdown.
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Required Actions
Inspect the TMF parts (P/N 9128M52 and 9137M92) per GE SB 72-957, Rev 2, with specific intervals based on cycles since new (CSN) and cycles in service (CIS). Remove from service TMF cases exceeding serviceable limits. Reinspect at intervals not exceeding 600/750 CIS for CF6-50/45 engines, or per SB schedules if cracks exist.
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Compliance Time
Required as indicated, unless previously accomplished.
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Affected Aircraft
General Electric Company CF6-50/-45 series engines installed on McDonnell-Douglas DC-10, Boeing 747, and Airbus A300 type aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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