# SDR SWAA2013040214404

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 27, 2013
- Submitted: April 3, 2013
- Operation: Air carrier
- Aircraft: [N477WN](https://openairdocs.org/aircraft/N477WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 33988
- Aircraft time: 31,701 hours, 18,514 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Shutoff Valve
- Part number: 32145526
- Part serial: 4274
- Condition: Failed
- Location: Bleed Air Sys
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2013040214404

## Discrepancy

DIVERSION - DUCT PRESSURE SPLIT AT CLIMB THRUST R=43 PSI: LEFT= 17 PSI.  N1 (BOTH ENGINES) 100.2%. N1'S EVENED OUT AGAIN AT CRUISE BOTH INDICATED L=10 AND R=30 ON DESCENT WITH THRUST LEVERS AT IDLE.  REMOVED AND REPLACED NR 1 PRSOV PER MM.

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