# SDR UIEA2010071100099

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 11, 2010
- Submitted: July 13, 2010
- Operation: Air carrier
- Aircraft: [N412MC](https://openairdocs.org/aircraft/N412MC), registered now
- Make and model: Boeing 747-47UF
- Registry model: [Boeing 747-47UF](https://openairdocs.org/model/boeing-747-47uf) (OpenAirDocs)
- Aircraft serial: 30559
- Aircraft time: 46,036 hours, 6,856 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Condition: Malfunctioned
- Location: Cabin Air
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: J, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2010071100099

## Discrepancy

ACFT WOULD NOT MAINTAIN CABIN PRESSURE, ALT 310. FLIGHT CREW FOLLOWED QRH PROCEDURES; RETURNED TO STATION. (FUEL REMOVED PRIOR TO LANDING: 62.0.  LANDING WT: 302,056) (UPON INSP, MX FOUND RT OUTFLOW VALVE AUTO MODE INOPERATIVE, MANUAL OPS NORMAL. RT OUTFLOW DEACTIVATED IN CLOSED POSITION IAW DDG AND AMM. CABIN PRESSURE CHECK NORMAL.)

---
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.