# SDR UALA2012081604558

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 16, 2012
- Submitted: September 14, 2012
- Operation: Air carrier
- Aircraft: N551UA
- Make and model: Boeing 757222
- Aircraft serial: 25399
- Aircraft time: 78,712 hours, 22,814 cycles
- Engine: Pwa PW2037
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Valve
- Condition: Failed
- Location: Bleed System
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2012081604558

## Discrepancy

LEFT BLEED TROUBLE.  ACCOMPLISHED HEALTH CHECK OF PRSOV AND REPLACED SOURCE AIR SWIVEL FITTING, SWIVEL LOOSE WHILE B NUT SEIZED.  IDLE OPS CHECKED AND FOUND NR 1 BLEED PRESSURE FLUTUATES BETWEEN 12-15 PSI.    REPLACED HIGH STAGE PILOT VALVE PER AMM 36-11-08.

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