# SDR 97UAL900397

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 23, 1997
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N4728U
- Make and model: Boeing 747122
- Aircraft serial: 19925
- Engine: Pwa JT9D7A
- System (JASC): [7260 · Turbine Engine Accessory Drive](https://openairdocs.org/jasc/7260)
- Part: Carbon Seal
- Part number: 647162602U
- Condition: Damaged
- Location: Nr 4 Engine
- Stage of operation: DE
- Nature of condition: Y, K, J
- Precautionary procedure: E
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/97UAL900397

## Discrepancy

NR 4 ENGINE SHUTDOWN DUE TO LOSS OF OIL PRESSURE.  LANDED AT LAX UNDER AMBER ALERT.  *S/D*  CSD QUICK ATTACH DEVICE WORKED LOOSE CAUSING EXCESSIVE PRESSURE ON THE GEARBOX CARBON SEAL.  SEAL CRACKED CAUSING OIL LOSS.  SEALS WERE REPLACED.

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