# SDR UALA2010122704713

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 24, 2010
- Submitted: December 30, 2010
- Operation: Air carrier
- Aircraft: [N663UA](https://openairdocs.org/aircraft/N663UA), registered now
- Make and model: Boeing 767322
- Aircraft serial: 27160
- Aircraft time: 76,122 hours, 12,385 cycles
- Engine: Pwa PW4060
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Shutoff Valve
- Part number: 7732887810
- Part serial: 107
- Condition: Intermittent
- Location: Bleed Air Sys
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2010122704713

## Discrepancy

BLEED AIR DUCT PRESSURE INTERMITTENTLY SURGING BTWN 20-40 PSI AT ALTITUDES BELOW 8000 FT. OCCURRED TWICE ON CLIMB POWER SETTINGS (1.46 EPR). ON ARRIVAL IDLE POWER (1.02-.99EPR) WITH BOTH ISOLATION VALVES CLOSED AND RT PRESSURE WAS SLIGHTLY HIGHER SURGING. SEEMS OK (1.05-1.20 EPR RANGE). REPLACED PRSOV IAW MM, CHECKS OK.

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