AD 93-25-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Corporation | 250-C20S | ALLISON Model 250-C20S Engines |
Unsafe Condition
Bolt fretting and fatigue failure of the main engine driveshaft flex coupling bolts, bushings, and nuts could lead to driveshaft detachment and engine failure.
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Required Actions
Within 90 days after the effective date, inspect the main engine driveshaft and replace the driveshaft flex coupling bolts, bushings, and nuts per Soloy Corporation Service Bulletin No. 04-780. Replace driveshafts with elongated bolt holes with serviceable parts.
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Compliance Time
Within 90 days after the effective date of this AD
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Affected Aircraft
Allison Model 250-C20S engines modified by Soloy Conversion, Ltd. STC SE2352NM, installed on but not limited to Cessna 206 and 207 airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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