# SDR UALA2009113003700

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 27, 2009
- Submitted: December 14, 2009
- Operation: Air carrier
- Aircraft: [N648UA](https://openairdocs.org/aircraft/N648UA), registered now
- Make and model: Boeing 767322
- Aircraft serial: 25285
- Aircraft time: 73,558 hours, 11,924 cycles
- Engine: Pwa PW4060
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Controller
- Part number: 77328915
- Part serial: 78
- Condition: Faulty
- Location: Nr 1
- Stage of operation: DE
- 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/UALA2009113003700

## Discrepancy

L HPSOV FLUCTUATES WITH THROTTLES AT IDLE IN DESCENT.  DURING PNEUMATIC HEALTH CHECK FOUND HPSOV SLUGGISH AND CONTROLLER FAILING TO COMMAND VALVE CLOSURE.  REPLACED VALVE AND CONTROLLER.  ALL CHECKS NORMAL.

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