Reference
Aviation glossary
Concise definitions for aviation terminology — from METAR and NOTAM to aerodynamics and airline operations. Search directly or scan alphabetically.
V
Vertical Wind ShearVertical wind shear is a change in wind speed or direction with altitude. It occurs when air at one altitude moves differently from air above or below it, creating rapid shifts in airspeed that are especially hazardous during approach and departure. VFRVFR (Visual Flight Rules) is a set of regulations that permits flight when visibility and cloud clearance are adequate for pilots to navigate by sight without relying solely on instruments. VFR MinimumsVFR minimums are the lowest legal weather conditions a pilot may fly under Visual Flight Rules, defined by minimum visibility and cloud clearance distances that vary by airspace class and time of day. VisibilityThe maximum distance a pilot can see and identify objects with the naked eye, measured in statute miles or meters. Visibility determines whether flight operations must follow visual or instrument procedures.
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