# SDR 98UAL900450

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 11, 1998
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N594UA
- Make and model: Boeing 757222
- Aircraft serial: 28145
- Engine: Pwa PW2037
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Valve
- Condition: Failed
- Location: E/E Compt
- Stage of operation: NR
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/98UAL900450

## Discrepancy

DIVERTED TO DEN WHEN IT BECAME DIFFICULT TO MAINTAIN CABIN PRESSURE.  *S/D*  EQUIPMENT COOLING OVERBOARD EXHAUST VALVE FAILED.  SHOP FOUND MOTOR BEARING FROZEN.  SHOP REPLACED BEARING AND VALVE OPERATES CORRECTLY.

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