# SDR AALA202512164641

- 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): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Relief Valve
- Condition: Failed
- Location: Zone 200
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: G, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202512164641

## 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).

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.