# SDR AALA202512168232

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 7, 2025
- Submitted: December 16, 2025
- Operation: Air carrier
- Aircraft: [N862NN](https://openairdocs.org/aircraft/N862NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 30905
- Aircraft time: 44,223 hours, 18,948 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Part number: 10622313
- Part serial: 10115256
- Condition: Failed
- Location: Zone 200
- Part time: 15,099 hours, 7,071 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A, I
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202512168232

## Discrepancy

AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: SHORTLY AFTER LEVEL OFF AT FL370, CABIN ALTITUDE ALERT SOUNDED AND FLASHED, MANUALLY DEPLOYED MASKS. AIRCRAFT DIVERTED TO AND LANDED SAFELY AT PIT.  GVI OF APU AIR DUCT BOOT. REMOVED AND REPLACED OUTFLOW VALVE (AALA202512088232). ALSO REMOVE AND REPLACED BOTH POSITIVE PRESSURE RELIEF VALVES (AALA202512164641), (AALA202512165396).

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