# SDR 99UAL900039

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 18, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N603UA
- Make and model: Boeing 767222
- Aircraft serial: 21864
- Engine: Pwa JT9D7R4D
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Valve
- Condition: Failed
- Location: Cabin
- Stage of operation: CL
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99UAL900039

## Discrepancy

UNABLE TO PRESSURIZE AIRCRAFT. RETURNED TO FIELD. *S/D*  OVERBOARD EXHAUST VALVE FAILED.  REPLACED OVERBOARD EXHAUST VALVE.  AIRCRAFT PRESSURIZED NORMALLY.  NO ADDITIONAL WRITE-UPS FOR EQUIPMENT COOLING OR PRESSURIZATION.

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