AD 83-01-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Corporation | 250-C28B | DETROIT DIESEL ALLISON Model 250-C28B and -C28C Series Engines |
| engine | Rolls-Royce Corporation | 250-C28C | DETROIT DIESEL ALLISON Model 250-C28B and -C28C Series Engines |
Unsafe Condition
Damage to the first stage turbine wheel due to oil fires caused by improper U-ring gasket or proper U-ring gasket incorrectly installed at the No. 8 bearing retainer plate.
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Required Actions
Inspect and pressure test the No. 8 bearing sump area within 5 hours time in service after the effective date for affected turbine assemblies meeting specific conditions. Before initial flight, inspect and pressure test uninstalled affected turbine assemblies. Equivalent compliance may be approved.
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Compliance Time
Within the next 5 hours time in service after the effective date of this AD
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Affected Aircraft
Detroit Diesel Allison Model 250-C28B and -C28C series engines with turbine assembly serial numbers CAT 70001 thru 70186, 70188, and 70191.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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