# SDR AALA202309119176

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 9, 2023
- Submitted: September 11, 2023
- Operation: Air carrier
- Aircraft: [N346PR](https://openairdocs.org/aircraft/N346PR), registered now
- Make and model: Boeing 737823
- Aircraft serial: 31273
- Aircraft time: 16,651 hours, 7,127 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Part number: 10622313
- Part serial: 17115251
- Condition: Inoperative
- Location: Zone 100 - Fuse
- Stage of operation: CL
- How discovered: V
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202309119176

## Discrepancy

AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED. AIRCRAFT RETURN TO DFW SAFELY. PRESSURIZATION FAILURE DURING CLIMB. REPLACED AFT OUTFLOW VALVE ASSEMBLY PER AMM 21-31-03.

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