# SDR 139807152006

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 15, 2006
- Submitted: July 17, 2006
- Operation: Air carrier
- Aircraft: [N498QS](https://openairdocs.org/aircraft/N498QS), registered now
- Make and model: Gulstm GIV
- Aircraft serial: 1398
- System (JASC): [3600 · Pneumatic System](https://openairdocs.org/jasc/3600)
- Part: Isolation Valve
- Part number: 39819631
- Part serial: 610
- Condition: Malfunctioned
- Location: Pneumatic Sys
- Part time: 5,881 hours, 2,918 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/139807152006

## Discrepancy

PNEUMATIC ISOLATION VALVE OPENS AND CLOSES DURING FLIGHT WITH NO INPUT FROM CREW.

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