AD 82-20-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | General Electric Company | CF6-45A | GENERAL ELECTRIC COMPANY Models CF6-45 and -50 Series Engines |
| engine | General Electric Company | CF6-45A2 | GENERAL ELECTRIC COMPANY Models CF6-45 and -50 Series Engines |
| engine | General Electric Company | CF6-50A | GENERAL ELECTRIC COMPANY Models CF6-45 and -50 Series Engines |
| engine | General Electric Company | CF6-50C | GENERAL ELECTRIC COMPANY Models CF6-45 and -50 Series Engines |
| engine | General Electric Company | CF6-50C1 | GENERAL ELECTRIC COMPANY Models CF6-45 and -50 Series Engines |
| engine | General Electric Company | CF6-50C2 | GENERAL ELECTRIC COMPANY Models CF6-45 and -50 Series Engines |
| engine | General Electric Company | CF6-50C2B | GENERAL ELECTRIC COMPANY Models CF6-45 and -50 Series Engines |
| engine | General Electric Company | CF6-50C2D | GENERAL ELECTRIC COMPANY Models CF6-45 and -50 Series Engines |
| engine | General Electric Company | CF6-50CA | GENERAL ELECTRIC COMPANY Models CF6-45 and -50 Series Engines |
| engine | General Electric Company | CF6-50E | GENERAL ELECTRIC COMPANY Models CF6-45 and -50 Series Engines |
Unsafe Condition
Cracks in first stage HPT disks (P/Ns 9045M34P07 and 9045M34P09) could result in engine failure.
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Required Actions
Inspect first stage HPT disks using 'double inspections' per GE Service Bulletins 72-700 or 72-709. Disks not previously inspected must be inspected before reaching 2,000 cycles (MTU serial) or 3,200 cycles (MPO serial). Reinspect every 750 cycles thereafter. Remove cracked disks from service. Disks with P/Ns 9045M34P07 and 945M34P09 cannot be returned to service after February 1, 1984.
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Compliance Time
Prior to reaching specified cycles in service as outlined in the schedule (e.g., 2,000 cycles for MTU, 3,200 for MPO, then every 750 cycles).
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Affected Aircraft
General Electric Company CF6-45A, CF6-45A2, CF6-50A, CF6-50C, CF6-50C1, CF6-50C2, CF6-50C2B, CF6-50C2D, CF6-50CA, and other CF6-45 and -50 series engines 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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