# SDR AALA202107199594

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 11, 2021
- Submitted: July 19, 2021
- Operation: Air carrier
- Aircraft: [N989AU](https://openairdocs.org/aircraft/N989AU), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 7307
- Aircraft time: 14,911 hours, 5,738 cycles
- System (JASC): [2100 · Air Conditioning System](https://openairdocs.org/jasc/2100)
- Part: Regulator Valve
- Part number: 6774G010000
- Part serial: 677413964
- Condition: Surges
- Location: Zone 400 - Nac/P
- Part time: 14,946 hours, 5,750 cycles
- Stage of operation: CR
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202107199594

## Discrepancy

AIRCRAFT WAS NOT GROUNDED: #2 PACK SURGING CAUSING PRESSURIZATION TO SWING, V/S +250 - 450FPM AT FL340. **SUPPLEMENTAL REPORT FOR AALA202107149594: REPLACED #2 ENGINE PRESSURE REGULATOR VALVE AND ACCOMPLISHED A SATISFACTORY LEAK / OPERATIONAL CHECK PER AMM 36-11-52 AND 21-51-00.  ** (CLSOED)

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