AD 68-12-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Corporation | 250-C10B (T63-A-5A) | ALLISON Models 250-C18, 250-C18A, 250-C18B, 250-C18C, 250-C19 and 250-C10B Engines. |
| engine | Rolls-Royce Corporation | 250-C18 | ALLISON Models 250-C18, 250-C18A, 250-C18B, 250-C18C, 250-C19 and 250-C10B Engines. |
| engine | Rolls-Royce Corporation | 250-C18A | ALLISON Models 250-C18, 250-C18A, 250-C18B, 250-C18C, 250-C19 and 250-C10B Engines. |
| engine | Rolls-Royce Corporation | 250-C18B | ALLISON Models 250-C18, 250-C18A, 250-C18B, 250-C18C, 250-C19 and 250-C10B Engines. |
| engine | Rolls-Royce Corporation | 250-C18C | ALLISON Models 250-C18, 250-C18A, 250-C18B, 250-C18C, 250-C19 and 250-C10B Engines. |
| engine | Rolls-Royce Corporation | 250-C19 | ALLISON Models 250-C18, 250-C18A, 250-C18B, 250-C18C, 250-C19 and 250-C10B Engines. |
Unsafe Condition
Compressor blades in the sixth stage of the engines may fail, which could result in engine failure.
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Required Actions
Modify the sixth stage compressor blades in accordance with Allison Commercial Engine Bulletin No. 250 CEB-48 or an approved method.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
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Affected Aircraft
Rolls-Royce Corporation Models 250-C18, 250-C18A, 250-C18B, 250-C18C, 250-C19, and 250-C10B engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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