# SDR 2026FA0000535

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 19, 2026
- Submitted: June 23, 2026
- Operation: General aviation
- Aircraft: [N755PM](https://openairdocs.org/aircraft/N755PM), registered now
- Make and model: Pilats PC1247E
- Aircraft serial: 1239
- Aircraft time: 3,681 hours, 2,915 cycles
- System (JASC): [3411 · Pitot/Static System](https://openairdocs.org/jasc/3411)
- Part: Pitot Head
- Condition: Obstructed
- Location: Zone 100
- Stage of operation: CR
- How discovered: O
- Nature of condition: C
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2026FA0000535

## Discrepancy

THE RT SIDE PITOT SYSTEM BECOMES BLOCKED, WITH THE SYMPTOM BEING THE RIGHT PFD (AND STANDBY) AIRSPEED SLOWLY DROPS TO 0. MAINTENANCE HAS CHECKED THE PROBE HEAT REPEATEDLY AND FOUND NO DEFECTS. THIS HAS HAPPENED TO ME ON AT LEAST TWO DIFFERENT PC12S. MY THEORY IS THAT WATER ENTERS THE PITOT SYSTEM AND FREEZES BEFORE IT CAN DRAIN OUT, AS THE SYSTEM RECOVERS WHEN DESCENDING THROUGH THE FREEZING LEVEL.

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