# SDR ASAA2012122293521

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 22, 2012
- Submitted: December 26, 2012
- Operation: Air carrier
- Aircraft: [N592AS](https://openairdocs.org/aircraft/N592AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35190
- Aircraft time: 18,784 hours, 5,981 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Shutoff Valve
- Part number: 32145525
- Part serial: 10433
- Condition: Failed
- Location: Nr1 Engine
- Part time: 18,774 hours, 5,979 cycles
- Stage of operation: CL
- 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/ASAA2012122293521

## Discrepancy

PNEUMATIC DUCT SPLIT DURING CLIMB AND CRUISE IN EXCESS OF 20 PSI.  LEFT DUCT INDICATES 20 PSI, RIGHT IS 40-45 PSI.  ACFT GROUNDED.  RAN NR 1 ENG ON GROUND AND VERIFIED LOW LT DUCT PRESS WITH PACKS ON.  R & R LT PRSOV IAW AMM 36-11-04 AND BAR IAW AMM 36-11-03.  ALSO, REPLACED PRSOV CONTROL AIR FLEX LINE.  SYS GROUND FUNCTIONAL TEST GOOD IAW AMM AND 36-11-00-710-801 BLEED AIR CROSSOVER TEST.

---
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.