# SDR UALA2009092803059

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 27, 2009
- Submitted: September 28, 2009
- Operation: Air carrier
- Aircraft: N552UA
- Make and model: Boeing 757222
- Aircraft serial: 26641
- Aircraft time: 67,534 hours, 19,416 cycles
- Engine: Pwa PW2037
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Isolation Valve
- Part number: 2790598101
- Part serial: 115
- Condition: Faulty
- Location: Bleed Air Sys
- 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/UALA2009092803059

## Discrepancy

FLT CREW REPORTS ISO VLV AMBER LIGHT ON.  RECYCLE OF B2, B3 C/B'S, NO HELP.  CYCLING BLEEDS ON-OFF, NO HELP ISO VLV APPEARS TO BE IN STUCK CLOSED POSITION.  REPLACED VALVE, CHECKS OKAY.

---
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.