# SDR WTXR201501080001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 2, 2015
- Submitted: January 8, 2015
- Operation: General aviation
- Aircraft: [N471MD](https://openairdocs.org/aircraft/N471MD), registered now
- Make and model: Cessna 525
- Registry model: [Cessna 525](https://openairdocs.org/model/cessna-525) (OpenAirDocs)
- Aircraft serial: 5250122
- Aircraft time: 4,398 hours, 3,539 cycles
- System (JASC): [3000 · Ice/Rain Protection System](https://openairdocs.org/jasc/3000)
- Part: Check Valve
- Part number: 1989001
- Part serial: 0253
- Condition: Blocked
- Location: Zone 500
- Part time: 4,398 hours
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/WTXR201501080001

## Discrepancy

DURING A MAINTENANCE RUN, THE LT ANTI-ICE CHECK VALVE CAME APART INTERNALLY AND SENT DEBRIS DOWNSTREAM TO THE WING ANTI-ICE VALVE AND THE DEBRIS BECAME LODGED IN THE WING ANTI-ICE VALVE.  THE WING ANTI-ICE VALVE WAS JAMMED BY THIS DEBRIS AND JAMMED IN THE OPEN POSITION WHICH CAUSED BLEED AIR TO BE SUPPLIED TO THE LT WING LEADING CAUSING IT TO WARP.

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