# SDR AALA202001139015

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 11, 2020
- Submitted: January 13, 2020
- Operation: Air carrier
- Aircraft: [N539UW](https://openairdocs.org/aircraft/N539UW), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 4082
- Aircraft time: 34,300 hours, 13,280 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Unknown
- Condition: Malfunctioned
- Location: Cabin Pressure
- Stage of operation: NR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202001139015

## Discrepancy

AIRCRAFT NOT GROUNDED: CABIN PRESSURIZATION FLUCTUATING IN BOTH SYSTEM 1 AND SYSTEM 2 CABV/S +- 300 FPM. CAB ALT STABLE FOR MOST PART +- 50 FT. PERFORMED TEST OF CABIN PRESSURE CONTROLLER #1 AND #2 IAW AMM 21-31-00-710-002-A. TEST OK NO FAULTS NOTED.

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