Glossary of Terms


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V

V Definitions

‘VF1’ means the design flap speed for procedure flight conditions.
*‘VFC/MFC’ means maximum speed for stability characteristics.
‘VFE’ means maximum flap extended speed.

'VFTO’ means final take-off speed.
‘VH’ means maximum speed in level flight with maximum continuous power.
’VLE’ means maximum landing gear extended speed.

‘VLO’ means maximum landing gear operating speed.
‘VLOF’ means lift-off speed.
‘VMC’ means minimum control speed with the critical engine inoperative.
'VMCA' means the minimum control speed, take-off climb.
‘VMCG’ means the minimum control speed, on or near ground.
‘VMCL’ means the minimum control speed, approach and landing.
‘VMO/MMO’ means maximum operating limit speed.
‘VMU’ means minimum unstick speed.
‘VNE’ means never-exceed speed.
‘VR’ means rotation speed.
‘VRA’ means rough airspeed.

VS’ means the stall speed or the minimum steady flight speed at which the aeroplane is controllable.
‘Vso’ means the stall speed or the minimum steady flight speed in the landing configuration.
‘Vs1’ means the stall speed or the minimum steady flight speed obtained in a specified configuration.
’Vs1g’ means the one-g stall speed at which the aeroplane can develop a lift force (normal to the flight
path) equal to its weight.
‘VT’ means maximum aerotow speed (JAR-22 only).
‘VT’ means threshold speed.
a ‘VTMAX’ means maximum threshold speed.

‘VTOSS’ means take-off safety speed for Category A rotorcraft.
‘VW’ means maximum winch-launch speed (JAR-22 only).

'VY' means speed for best rate of climb.
'V1 means take-off decision speed. The maximum speed in the take-off at which the pilot must take the first action (e.9. apply
brakes, reduce thrust, deploy speed brakes) to stop the aeroplane within the accelerate-stop
distance. V1 also means the minimum speed in the take-off, following a failure of the critical engine at
VEF, at which the pilot can continue the take-off and achieve the required height above the take-off
surface within the take-off distance.
'V2' means take-off safety speed.
'V2min means minimum take-off safety speed.
'V3' means steady initial climb speed with all engines operating.


VA

'VA’ means design manoeuvring speed.


VAAC

Volcanic ash advisory centre (VAAC). A meteorological centre designated by regional air navigation agreement to provide
advisory information to meteorological watch offices, area control centres, flight information centres, world area forecast
centres and international OPMET databanks regarding the lateral and vertical extent and forecast movement of volcanic
ash in the atmosphere following volcanic eruptions.


Variable Pitch Propellers

'Variable Pitch Propellers’ means a propeller, the pitch setting of which changes or can be changed,
when the propeller is rotating or stationary. This includes:-


a.) A propeller, the pitch setting of which is directly under the control of the flight crew (controllable
pitch propeller).

b) A propeller, the pitch setting of which is controlled by a governor or other automatic means
which may be either integral with the propeller or a separately mounted equipment and which
may or may not be controlled by the flight crew (constant speed propeller).

c) A propeller, the pitch setting of which may be controlled by a combination of the methods of a.
and b.


VASI TVASI T-VASI

Visual Approach Slope Indicator, and TVASI (T-VASI)

 

       


VB

'VB’ means design speed for maximum gust intensity.


Vc

'VC’ means design cruising speed.


VD/MD

'VD/MD’ means design diving speed.


VDL

VHF digital link (VDL). A constituent mobile subnetwork of the aeronautical telecommunication network (ATN), operating
in the aeronautical mobile VHF frequency band. In addition, the VDL may provide non-ATN functions such as, for
instance, digitized voice


VdMd

VDF/MDF’ means demonstrated flight diving speed.



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