# SDR UALA2010042601384

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 23, 2010
- Submitted: May 14, 2010
- Operation: Air carrier
- Aircraft: [N791UA](https://openairdocs.org/aircraft/N791UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26933
- Aircraft time: 55,231 hours, 8,167 cycles
- Engine: Pwa PW4090
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Modulating Valve
- Part number: 32153947
- Part serial: 341
- Condition: Faulty
- Location: Hyd System
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2010042601384

## Discrepancy

IN CRUISE FL350 AIR SYNOPTIC SHOWS PRESS TO AIR C2 HYD PUMP.  DURING TROUBLESHOOTING FOUND DEFECTIVE VALVE. REPLACE MODULATING VALVE, ALL OPS OK.

---
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.