# SDR UALA2010112304332

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 23, 2010
- Submitted: December 3, 2010
- Operation: Air carrier
- Aircraft: N590UA
- Make and model: Boeing 757222
- Aircraft serial: 28708
- Aircraft time: 51,425 hours, 14,327 cycles
- Engine: Pwa PW2037
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Valve
- Part number: 32144882
- Part serial: 1801
- Condition: Fluctuates
- Location: Duct Pressure
- Stage of operation: DE
- 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/UALA2010112304332

## Discrepancy

LEFT DUCT PRESSURE FLUCTUATED ON DESCENT 10-25PSI.  REPLACED PRE REGULATOR, CHECKS GOOD.

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