AD 86-16-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Corporation | 250-C28B | ALLISON GAS TURBINE DIVISION, GENERAL MOTORS CORP. Model 250-C28B and -C28C Engines |
| engine | Rolls-Royce Corporation | 250-C28C | ALLISON GAS TURBINE DIVISION, GENERAL MOTORS CORP. Model 250-C28B and -C28C Engines |
Unsafe Condition
Cracks under the rim of the first stage turbine wheel caused by possible internal oil fires that can progress to an on-speed failure/uncontained failure.
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Required Actions
Maintain a record of oil consumed and flight hours until compliance with installing the Number 8 Bearing Scavenge Line Air/Oil Centrifugal Separator Assembly (P/N 23034772). Troubleshoot and repair before further flight any engine showing high oil consumption (1 quart in 5 hours), significant step change in oil consumption, or excessive smoking on deceleration/shutdown. Install the specified separator assembly by January 31, 1987.
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Compliance Time
not later than January 31, 1987
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Affected Aircraft
Allison Model 250-C28B and -C28C engines with turbine serial numbers CAT 70011 thru 70804 (C28B) and CAT 28001 thru 28098 (C28C), except those already incorporating Allison CEB-A-72-2138 or equivalent.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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