# SDR UALA2012050102577

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 28, 2012
- Submitted: May 25, 2012
- Operation: Air carrier
- Aircraft: [N794UA](https://openairdocs.org/aircraft/N794UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26953
- Aircraft time: 64,718 hours, 9,196 cycles
- Engine: Pwa PW40903
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Controller
- Part number: 11511007
- Part serial: 13
- Condition: Faulty
- Location: Bleed System
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2012050102577

## Discrepancy

AFTER TAKEOFF ACFT HAD LEFT BLEED PROBLEM.  LEFT PACK SHUT DOWN.  RETURNED TO DEPARTURE.  REPLACED HPFAC AND ASCPC PER AMM.  PERFORMED PNEUMATIC LINE LEAK CHECKS- ALL PLUMBING CHECKED NORMAL. PERFORMED GROUND TEST VIA THE MAT- ALL TEST PASS.

---
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.