# SDR ASAA2015072512592

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 25, 2015
- Submitted: July 28, 2015
- Operation: Air carrier
- Aircraft: [N533AS](https://openairdocs.org/aircraft/N533AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35201
- Aircraft time: 17,862 hours, 5,307 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Regulator
- Part number: 1074847
- Part serial: 10172
- Condition: Failed
- Location: Nr 2 Engine
- Part time: 28,621 hours, 8,796 cycles
- Stage of operation: NR
- 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/ASAA2015072512592

## Discrepancy

A/C DUCT SPLIT PRESSURE DIFFERENTIAL 20 PSI RIGHT DUCT 17, LT DUCT 37.  ACFT GROUNDED. REPLACED PRECOOLER CONTROL VALVE, REF AMM 36-12-02.  REPLACED HIGH STAGE REGULATOR REF AMM 36-11-07.  REPLACED HIGH STAGE VALVE REF AMM 36-11-06.  NO LEAKS NOTED.  RAN BOTH ENGINES NO DUCT SPLIT NOTED.  ALL WORK PERFORMED ON NR 2 ENGINE.

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