# SDR Z8G2011F00000

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 28, 2011
- Submitted: July 29, 2011
- Operation: Air carrier
- Aircraft: [N960EM](https://openairdocs.org/aircraft/N960EM), registered now
- Make and model: Cessna 421B
- Registry model: [Cessna 421B](https://openairdocs.org/model/cessna-421b) (OpenAirDocs)
- Aircraft serial: 421B0881
- Engine: Cont GTSIO520H
- System (JASC): [8120 · Exhaust Turbocharger](https://openairdocs.org/jasc/8120)
- Part: Thrust Bearing
- Part number: 4072620000
- Condition: Mismanufactured
- Location: Turbocharger
- Stage of operation: IN
- How discovered: V
- Nature of condition: W
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/Z8G2011F00000

## Discrepancy

PILOT REPORTED EXCESSIVE LOSS OF OIL AND LOW OIL PRESSURE ON RT ENGINE.  DISASSEMBLY OF TURBOCHARGER REVEALED THE 3 GROOVES ON THE INBD THRUST BRG WERE MACHINED INCORRECTLY.   THEY ARE TOO LARGE TO THE EDGE OF BEARING ALLOWING OIL TO BYPASS.  BEARING PIN 407262-000.

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