# SDR 2004UALA00007

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 4, 2004
- Submitted: February 10, 2004
- Operation: Air carrier
- Aircraft: N377UA
- Make and model: Boeing 737322
- Aircraft serial: 24642
- Aircraft time: 40,062 hours, 28,624 cycles
- Engine: Ge CFM56*
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Relief Valve
- Part number: 7207375
- Part serial: MR21395
- Condition: Failed
- 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/2004UALA00007

## Discrepancy

AT FLIGHT LEVEL 33.0 LOST PRESSURIZATION, OXYGEN MASKS DEPLOYED INADVERTENTLY.  CABIN SAFETY PRESSURE RELIEF VALVES FAILED.  REPLACED INBOARD & OUTBOARD RELIEF VALVES.

---
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.