← Back to Aviation Glossary
VASI (Visual Approach Slope Indicator)
A visual glide-path aid that uses red and white light bars beside the runway to help pilots maintain a safe approach angle. A disabled VASI is a common NOTAM item that can change night or VFR approach planning.
Want to go beyond the definition? This term is covered in depth in AviatorPro's Private Pilot License ground school.
Learn more in Private Pilot License→Related Terms
- VFR (Visual Flight Rules)A set of regulations under which a pilot operates an aircraft by visual reference to the ground and specific visibility and cloud clearance requirements. VFR flight is the standard for private pilots and does not require an instrument rating.
- Vmc (Minimum Control Speed)The minimum speed at which an aircraft can maintain directional control with one engine inoperative, the other at takeoff power, and specific configurations. Vmc is a critical concept in multi-engine training and marked with a red radial line on the airspeed indicator.
- VOR (VHF Omnidirectional Range)A ground-based radio navigation aid that transmits VHF signals in 360 radials, allowing pilots to determine their magnetic bearing to or from the station. VORs are used for en route navigation and many instrument approach procedures.
- Wake TurbulenceCounter-rotating wingtip vortices generated by an aircraft producing lift. Wake turbulence is strongest behind heavy, clean, slow aircraft and can exceed a light airplane's roll-control authority. Pilots avoid it by staying above and landing beyond a preceding heavier aircraft's path.