# SDR UALA2011060902852

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 8, 2011
- Submitted: June 10, 2011
- Operation: Air carrier
- Aircraft: N551UA
- Make and model: Boeing 757222
- Aircraft serial: 25399
- Aircraft time: 74,529 hours, 21,555 cycles
- Engine: Pwa PW2037
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Pilot Valve
- Part number: 33990046U2
- Part serial: 202
- Condition: Faulty
- Location: Bleed Air Sys
- Stage of operation: IN
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2011060902852

## Discrepancy

UNABLE TO COOL AC ON GROUND WITH ENGINE BLEEDS ONLY ON IDLE.  R 8 PSI, L 15 PSI.  AC NORMAL IN FLT.  PER MEL REPLACED HI STAGE PILOT PER AMM.

---
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.