Glossary Papakupu
Explanations of abbreviations and acronyms.
- VAI
- The trade association for the global civil vertical-aviation industry; formerly the Helicopter Association International (HAI), it changed its name to reflect the growth of non-helicopter vertical aviation, including drones.
- VAI
- Vertical Aviation International
- Validate
- Confirmation by examination and provision of objective evidence that the particular requirements for a specific intended use are fulfilled. In terms of a flight plan clearance, a controller will validate a flight plan when the details match what has been filed with the air traffic service, and the plan is ready to be activated.
- VDR
- Voyage Data Recorder
- Vectran
- A multifilament yarn spun from liquid crystal polymer and manufactured by Kuraray.
- Veer-off
- An aircraft departs the side of a runway
- VEMD
- Vehicle and Engine Multifunction Display
- Vent line
- A line, normally coloured red and white, used to open a vent at the top of an envelope and increase the rate of descent.
- Ventilation damper
- A valve that stops or regulates the supply of air to the ventilation fan.
- Versine
- The distance from the circumference of a circle to the mid-point of a chord of that circle
- Vertical load
- The downward force on an individual wheel can vary as a wagon travels along a track. When the vertical load is low compared to the lateral force, the wheel can climb the rail, potentially leading to a derailment.
- Vertical stabilisers
- Designed to provide an aerodynamic force to reduce pilot’s pedal input when the helicopter is in forward flight.
- Vessel's draught
- The depth of the hull immersed in the water
- Vessel's firefighting plan
- A shipyard plan that shows the layout of the vessel and locations of firefighting systems, equipment and control stations and other relevant information.
- Vessel's flag state
- The country where a ship is registered.
- Vessel's trail
- A residual radar image that represents a vessel’s past track over a user-defined period of time.
- Vessels of opportunity
- Nearby commercial and recreational vessels used to assist with a response.
- Vessels' arrival draught
- How deep a ship sits in the water.
- Vestibule
- An enclosed area at the end of rail carriages containing a doorway leading to adjoining carriages
- VFR
- Visual flight rules
- VHF
- Very high frequency
- Vigilance system
- A system that will directly initiate an emergency brake application if an acknowledgment input is not received within a specified time increment
- Virtual aid to navigation
- A virtual aid to navigation is a navigational feature or hazard that is displayed on a vessel’s chart plotter, AIS display or other receiving equipment within range.
- Visible moisture
- Cloud or freezing rain
- Visual
- A ‘visual’ call provides confirmation that: the pilot is able to maintain continuous visual reference with the terrain ahead: the visibility is equal to or greater than the minima prescribed for the approach; and the pilot is able to make a normal landing.
- Visual approach
- An approach to a runway at an airport conducted under instrument flight rules, but where the pilot proceeds by visual reference and clear of clouds to the airport
- Visual flight conditions
- Clear of cloud and in sight of ground or water.
- VOLMET
- An aviation weather forecast service for selected airfields, transmitted over a five-minute interval every 30 minutes on specified high-frequency radio channels (AIP GEN 3.5, p. 30).
- Voyage charter
- When a vessel and crew are hired for a voyage carrying a specified cargo between a load port and a discharge port
- Voyage data recorder
- Equipment that records information sourced from various on-board systems, including bridge microphone recordings.
- VRS
- Vortex Ring State
- VTS
- Vessel Traffic Service providing navigational assistance and monitoring