AD 2010-07-08
Unsafe Condition
Separation or seizure of the turbocharger turbine due to a rough surface finish on the turbine wheel shaft exceeding allowable limits, which disrupts the hydrodynamic layer of oil between the shaft and mating bearings.
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Required Actions
Remove from service certain part number (P/N) and serial number (S/N) rebuilt turbochargers listed in Kelly Aerospace Energy Systems, LLC Service Bulletin (SB) No. 039 A, dated February 10, 2010.
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Compliance Time
Within 10 hours time-in-service after the effective date of this AD.
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Affected Aircraft
Kelly Aerospace Energy Systems, LLC rebuilt turbochargers with specific part numbers (P/Ns) and serial numbers (S/Ns) listed in Table III of Kelly Aerospace Energy Systems, LLC Service Bulletin (SB) No. 039 A, dated February 10, 2010. These rebuilt turbochargers are installed on, but not limited to, the engines and aircraft listed in Table IV of the same service bulletin.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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