# SDR UALA2012081604557

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 15, 2012
- Submitted: August 17, 2012
- Operation: Air carrier
- Aircraft: N551UA
- Make and model: Boeing 757222
- Aircraft serial: 25399
- Aircraft time: 78,706 hours, 22,811 cycles
- Engine: Pwa PW2037
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Regulator
- Part number: S212N1023
- Part serial: 68
- Condition: Faulty
- Location: Pneumatic 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/UALA2012081604557

## Discrepancy

ZERO PNEUMATIC PRESSURE FROM LEFT ENGINE.  REMOVED AND REPLACED PRSOV CONTROLLER NR 1 ENG, GROUND RAN.  OPS CHECKED GOOD.

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