# SDR ASAA2012063092448

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 3, 2012
- Submitted: July 3, 2012
- Operation: Air carrier
- Aircraft: [N581AS](https://openairdocs.org/aircraft/N581AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35188
- Aircraft time: 19,627 hours, 6,105 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Regulator
- Part number: 1074847
- Part serial: 7775
- Condition: Failed
- Location: Nr 1 Engine
- Part time: 20,495 hours, 9,074 cycles
- Stage of operation: CR
- 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/ASAA2012063092448

## Discrepancy

DUCT PRESSURE READING LT 25 PSI, RT 44 PSI BOTH  FL370 & FL 340.  GROUNDED - YES. PERFORMED PNEU SYST.  TROUBLESHOOTING REF 36-11-00-700-804.  R & R PRECOOLER CONTROL VALVE REF 36-12-02.  R & R PRSOV REF 36-11-04.  R & R HIGH STAGE REGULATOR REF 36-11-07, LEAK CHECKS NORMAL FOR ALL 3 PARTS.  ACCOMPLISHED ENGINE BLEED AIR CROSSOVER OPS TEST REF MM 36-11-00-710-801.  OPS CHECKED GOOD.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.