# SDR UALA2009071602104

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 16, 2009
- Submitted: July 17, 2009
- Operation: Air carrier
- Aircraft: [N774UA](https://openairdocs.org/aircraft/N774UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26936
- Aircraft time: 54,338 hours, 10,742 cycles
- Engine: Pwa PW4077
- System (JASC): [2830 · Fuel Dump System](https://openairdocs.org/jasc/2830)
- Part: Check Valve
- Part number: 568131509000
- Condition: Faulty
- Location: Center Fuel Tank
- Stage of operation: NR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2009071602104

## Discrepancy

UNWANTED FUEL TRANSFER TO CTR TANK.  FUEL BACK FEEDING INTO CTR TANK FROM LT MAIN TANK AT RATE OF 1.0- HOUR, TROUBLESHOOTING FOUND THE C-TANK LT BOOST PUMP OVERRIDE CHECK VALVE AT FAULT.  REPLACED CENTER TANK LT OVERRIDE JETTISON CHECK VALVE.

---
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.