# SDR 2006FA0000055

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 9, 2006
- Submitted: January 19, 2006
- Operation: General aviation
- Aircraft: [N411AJ](https://openairdocs.org/aircraft/N411AJ), registered now
- Make and model: Lear 45LEAR
- Aircraft serial: 2011
- Engine: Garrtt TFE7312
- System (JASC): [7261 · Turbine Engine Oil System](https://openairdocs.org/jasc/7261)
- Part: Carbon Seal
- Part number: 30745732
- Part serial: 050515840410
- Condition: Worn
- Location: Engine
- Part time: 747 hours
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2006FA0000055

## Discrepancy

PERFORMED SOAP SAMPLE DUE TO FILTER BYPASSED.  SAMPLE CAME BACK NORMAL.  PERFORMED ANOTHER SOAP SAMPLE 50 HOURS LATER AND FILTER FAILED DELTA P-CHECK.  RESULTS CAME BACK (INSPECT THIS ENGINE IMMEDIATELY) INSTALLED LOANER ENGINE.  ORIGINAL ENGINE HAD NR 1, NR 3, NR 4 AND NR 5 CARBON SEALS REPLACED.  RE-INSTALLED ORIGINAL ENGINE AFTER REPAIRE.  25 HOUR SOAP SAMPLE RESULTS ARE NORMAL.  PROBABLE CAUSE IS PREMATURE WEAR/FAILURE OF CARBON SEALS.  RECOMMEND IMPROVING CARBON SEAL MATERIAL AND QUALITY. (K)

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