# SDR AALA201608049007

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 3, 2016
- Submitted: August 8, 2016
- Operation: Air carrier
- Aircraft: [N549UW](https://openairdocs.org/aircraft/N549UW), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 4932
- Aircraft time: 17,248 hours, 6,234 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Unknown
- Condition: Malfunctioned
- Location: Cabin Pressure
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA201608049007

## Discrepancy

AIRCRAFT WAS NOT GROUNDED, FLIGHT CREW REPORTED IN CRUISE AT FL330, ACFT LOST PRESSURIZATION.  EMERGENCY DESCENT TO 10,000' WAS ACCOMPLISHED.  PRESSURIZATION SYS STARTED WORKING AT 10,000 MSL P 4.3 V/SO CABIN ALT 400'.  MAINTENANCE ACCOMPLISHED TSM 21-31-00-810-809-A, NO FAULT RECORDED ON PFR, PERFORMED CABIN PRESSURE SYS TEST IAW AMM 21-31-00-710-002-A, NO FAULTS NOTED.

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