# SDR ASAA2015022610809

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 26, 2015
- Submitted: March 2, 2015
- Operation: Air carrier
- Aircraft: [N557AS](https://openairdocs.org/aircraft/N557AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35176
- Aircraft time: 33,558 hours, 9,899 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Shutoff Valve
- Part number: 32145526
- Part serial: 7832
- Condition: Failed
- Location: Nr 2 Engine
- Part time: 34,043 hours, 14,624 cycles
- Stage of operation: TX
- 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/ASAA2015022610809

## Discrepancy

WITH NR 1 ENGINE RUNNING, TRYING TO START NR 2 ENG THE APU AIR DOES NOT RISE ABOVE 20 PSI - WITH ISOLATION VALVE SWITCH IN AUTO OR OPEN, DOES NOT AFFECT THE PRESSURE, STILL 20 PSI, MAKING NR 2 ENG SLOW TO SPOOL.  ACFT GROUNDED. FOUND PRSOV ON NR 1 ENG DEFECTIVE.  R & R NR 1 PRSOV REF AMM 36-11-04.  RAN NR 1 ENG, OPS CK NORMAL. ALL ENGINES OPERATING NORMALLY, GOOD FOR SERVICE.

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