| Acronym |
Definition |
| - Va |
design maneuvering speed |
| - Vfe |
maximum flap extension speed |
| - Vmca |
minimum control speed (air). The minimum speed at which control of a twin-engined aircraft can be maintained after failure of one engine. |
| - Vne |
never-exceed speed. |
| - Vmo |
maximum operating speed. Also Mmo, Mach limit maximum operating speed. |
| - Vno |
normal operating speed. |
| - Vr |
rotation speed, at which to raise the nose for take-off. |
| - Vso |
stalling speed at MTWA, in landing configuration with flaps and landing gear down, at sea level. |
| - Vx |
best angle of climb speed on all engines. |
| - Vxse |
best engine-out angle of climb speed. |
| - Vy |
best rate of climb speed on all engines. |
| - Vyse |
best engine-out rate of climb speed |
| - Vnav |
Vertical Navigation. |
| VAL |
Visual Approach and Landing Chart. |
| VAR |
Variation (magnetic) |
| VASIS |
Visual Approach Slope Indicator System. A coloured light system providing visual guidance to the glidepath of a runway. |
| VDF |
Very-High Frequency Direction-Finding, whereby an aircraft's bearing from a ground receiving station may be determined from its RT transmissions. |
| VFR |
Visual Flight Rules. Prescribed for the operation of aircraft in visual meteorological conditions (VMC). VMC is generally defined as five miles visibility or more and 1,000 feet vertical and one nautical mile horizontal clearance from cloud, but variations apply to aircraft operating below 3,000 feet amsl. |
| VHF |
Very High Frequency. Radio frequencies in the 30-300 MHz band, used for most civil air-to-ground communication. |
| VIS |
Visibility. |
| VLF |
Very Low Frequency. Radio frequencies in the 3-30 kHz band. |
| VLF/Omega |
Worldwide system of long-range navigation using VLF radio transmission. |
| VMC |
Visual Meterorological Conditions. See VFR. |
| Volmet |
Continuous recorded broadcasts of weather conditions at selected airfields. |
| VOR |
"Very High Frequency omnidirectional range. A radio navigation aid operating in the 108-118 MHz band" |
| VORTAC |
Combined VOR and TACAN |
| VOT |
VOR test facility. |
| VP |
Variable-Pitch (propeller), whose blade angle can be altered in flight either automatically or manually. |
| VRP |
Visual Reporting Point. Landmarks used for position reporting by aircraft operating VFR. |
| VSI |
Vertical Speed Indicator. One of the primary flight instruments showing rate of climb or descent. |
