# SDR USAA2013040800012

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 5, 2013
- Submitted: April 8, 2013
- Operation: Air carrier
- Aircraft: [N536UW](https://openairdocs.org/aircraft/N536UW), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 4025
- Aircraft time: 11,505 hours, 4,439 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Part number: 2079003AC
- Part serial: 11116416
- Condition: Malfunctioned
- Location: Cabin Pressure
- Part time: 4,990 hours, 1,743 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/USAA2013040800012

## Discrepancy

AT 33,000 FEET LOST PRESSURE SYSTEMS 1 AND 2, WENT TO MANUAL.  OK WITH CABIN PRESSURE.  REMOVED AND REPLACED OUTFLOW VALVE IAW AMM 21-31-51.

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