One of the most-often busted federal aviation regulations is VFR cloud clearances. That’s because pilots often have a hard time judging how close they really are to clouds. We all know that in Class E airspace below 10,000 feet msl we need at least 3 statute miles of visibility and must remain 500 feet below, 1,000 feet above and 2,000 feet horizontally from clouds.
Judging VFR Cloud Distances
Key Takeaways:
- VFR cloud clearance violations are common because pilots struggle to accurately judge their distance from clouds due to visual illusions, despite knowing the regulatory requirements.
- Pilots can approximate lateral cloud separation by identifying ground landmarks or shadows under the cloud with a sectional chart, or by converting distance to time (e.g., 2,000 feet is 10 seconds at 110 knots).
- While exact measurement is difficult, pilots should prioritize safety by giving clouds a wider berth than legally required to avoid unexpected encounters with IFR traffic.
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