# SDR UALA2009030200682

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 1, 2009
- Submitted: March 4, 2009
- Operation: Air carrier
- Aircraft: N552UA
- Make and model: Boeing 757222
- Aircraft serial: 26641
- Aircraft time: 65,096 hours, 18,717 cycles
- Engine: Pwa PW2037
- System (JASC): [7530 · Compressor Bleed Control](https://openairdocs.org/jasc/7530)
- Part: Valve
- Part number: 32144882
- Part serial: 17
- Condition: Faulty
- Location: Lt Engine
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2009030200682

## Discrepancy

RTO AT APPROX 70KTS DUE TO LEFT ENG HIGH STAGE LIGHT ILLUMINATING.  REPLACED LT ENGINE HPSOV AND HIGH STAGE PILOT VALVE, NO HELP.  CONTINUING TO TROUBLESHOOT NR 1 ENG READS 4 PSI NO HIGH STAGE AFTER HIGH STAGE AND PILOT VALVE REPLACEMENT AT IDLE.  BLEED LIGHT STAYS ON, 1-12 FOUND K10197 LEFT PRSOV VALVE OFF RELAY INOP.  REPLACED RELAY K10197.  WILL REQUIRE TEST OF LEFT HIGH STAGE BLEED AIR.  ACP'D PNEUMATIC HEALTH CK ON NR 1 ENG, ON THE FOLLOWING COMPONENTS.  HPC, HPSOV, PRSOV, PRC, AND FAMV.  ALL COMPONENTS PASSED.  ACP'D PNEUMATIC SYS TEST ON NR 1 ENG.  ALL PARAMETERS WITHIN LIMITS.

---
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.