# SDR P5CA0401275

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 16, 2004
- Submitted: December 7, 2004
- Operation: Air carrier
- Aircraft: [N858FT](https://openairdocs.org/aircraft/N858FT), registered now
- Make and model: Boeing 747123
- Aircraft serial: 20109
- Aircraft time: 78,140 hours, 18,605 cycles
- Engine: Pwa JT9D7A
- Engine time: 71,200 hours, 15,730 cycles
- System (JASC): [7261 · Turbine Engine Oil System](https://openairdocs.org/jasc/7261)
- Part: Seal
- Part number: 80427
- Condition: Failed
- Location: Nr 1 Engine
- Stage of operation: CR
- How discovered: O
- Nature of condition: K, J
- Precautionary procedure: E, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/P5CA0401275

## Discrepancy

DURING CRUISE AT FL 36.0, NR 1 ENGINE OIL PRESSURE FLUCTUATING 40-35 PSI WITH OIL PRESSURE LIGHT DOING SAME.  OIL PRESSURE WENT TO 25 PSI WITH STEADY LOW OIL PRESSURE LIGHT ON, ENGINE SHUTDOWN, WINDMILLING OIL PRESSURE 15-20 PSI.  REPLACED STARTER SEAL PER AMM 80-11-02 & 80-11-00, PERFORMED ENGINE RUN UP, LEAK CHECK NORMAL PER AMM 71-00-00.

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