# SDR UALA2011042001912

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 20, 2011
- Submitted: April 22, 2011
- Operation: Air carrier
- Aircraft: [N668UA](https://openairdocs.org/aircraft/N668UA), registered now
- Make and model: Boeing 767322
- Aircraft serial: 30024
- Aircraft time: 43,138 hours, 11,573 cycles
- Engine: Pwa PW4056
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Controller
- Part number: 7927558
- Part serial: 218
- Condition: Faulty
- Location: Bleed Air Sys
- 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/UALA2011042001912

## Discrepancy

CREW COMMENTS:  DURING CLIMB L 11PSI AND R 36PSI.  IN CRUISE L15PSI AND R 25PSI.  NEED TO CHK ALL MUSCLE LINES TO HPSOV, HPSOVC, PRV, PRVC, FAMV ON NR 1 ENG FOR LEAKS.  CHECKED ALL MUSCLE LINES.  NO LEAKS FOUND.  REPLACED PRV CONTROLLER PER MM.  DECAY CHECK ON NR 1 ENG FAN AIR TEMPERATURE SENSOR LINES CHECKED GOOD, NO LEAKS.  REPLACED NR 1 FATS, OPS CKD GOOD ON HI-PWR ENG RUN TKO 4 MINS NO SPLIT, BLD SHIFT NML GOING UP & DWN , NO FAULTS.

---
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.