Weather
Part 107 Weather Minimums and Operational Limits
A concise review of visibility, cloud clearance, wind, density altitude, and when legal does not necessarily mean safe.
Key takeaway
Regulatory minimums define a legal boundary; aircraft limits, mission requirements, and local hazards may demand a much larger safety margin.
Visibility and cloud clearance
Part 107 establishes minimum flight visibility and distance from clouds. These numbers are common exam material, but safe decision-making requires applying them to the operation.
Visibility is measured from the control station, while cloud clearance protects the operation from conflicts with other aircraft and rapidly changing conditions.
Wind is more than one number
Compare sustained wind, gusts, direction, and local terrain effects with the aircraft manufacturer's limitations.
A mission near buildings or trees can experience turbulence and channelled flow that is not obvious from a nearby weather report.
Density altitude affects small UAS too
High temperature, low pressure, and humidity reduce air density. The aircraft may need more power to produce lift, reducing endurance and performance margin.
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