# SDR ASAA2013050994778

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 9, 2013
- Submitted: May 14, 2013
- Operation: Air carrier
- Aircraft: [N559AS](https://openairdocs.org/aircraft/N559AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35178
- Aircraft time: 24,783 hours, 7,456 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Shutoff Valve
- Part number: 1074926
- Part serial: 9858
- Condition: Failed
- Location: Nr 1 Engine
- Part time: 19,284 hours, 6,319 cycles
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2013050994778

## Discrepancy

WITH NR 2 ENG START FIRST, NR 1 ENG WILL ONLY MAX MOTOR TO 23 N2.  ACFT GROUNDED.  WITH NR 2 ENGINE RUNNING NR 1 ENGINE MOTORED TO 23.  DUCT PRESSURE APPROX 15-20 PSI.  TURNED OFF NR 2 ENGINE BLEED SWITCH AND PRESSURE RESUMED TO NORMAL AND MAX MOTOR WENT TO 30 N2.   TURNING THE ISOLATION SWITCH TO CLOSED WILL ACCOMPLISH THE SAME.  REPLACED PRSOV IAW MM 36-11-04 3. A-I.  REPLACED BLEED AIR REGULATOR IAW MM 36-11-03-400 A-F.

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