1Dk4eXg

VAT
VAT 1 Value-added tax; applicable to light and sport
aircraft (UK).
2 Vernier axial thruster.
3 Visually-augmented target.
4 Vertical-acceleration threshold.
V AT Target threshold speed; scheduled speed for arrival
at threshold at screen height of 10 m after steady stable
approach at angle of descent not less than 3°. Usually
about 1.3 V s (see V Tmax, V Tmin ). Subdivided: V AT 0 , all
engines operating; V AT1 , one engine failed; V AT2 , two
engines failed, etc.
VATAS Voice and tone annunciation system, synthesized
voice warnings to helicopter pilot in NOE flight.
Vat-B Short-form weather report comprising word
‘weather’ and four numbers (DoD, from vis, amount
[cloud], top [cloud] and base [cloud] ).
Vatcas Very advanced ATC automation system (G).
VATE Versatile affordable turbine engine (NASA).
VATLS Visual airborne target-locator system; laser
ranging device.
Vatol Vertical-attitude takeoff and landing, ie ‘tailstanding’.
VATS, Vats Video-augmented tracking system.
VATT Visually augmented tow target.
VAU Voltage averaging unit.
VAVB Variable-area vane box.
VAW Volcanic-ash warning (ICAO study group).
VAWS Voice-alarm warning system.
VAWT Vertical-axis wind turbine.
V axial Axial velocity, especially of flow through an axial
compressor or turbine.
VB 1 Vertical build [of engine]; A adds area.
2 Vacuum-bonded.
V B Maximum speed at which specified gust (eg 66 ft/s)
can be withstood without airframe damage; hence speed
at left lower and upper corners of basic gust envelope.
Usually more than half V c and less than half V D . Plays role
in establishing V RA .
V b Fluid velocity relative to propeller-blade at radius r,
= TAS + ω r + V 2 .
VBC 1 Velocity blast contour.
2 Video bandwidth compression.
V BE Speed for best flight endurance.
V BG Airspeed for best glide ratio.
VBI Verband Beratender Ingenieure (G).
V BL MIL/DefStan requirements define balked-landing
speed as whichever is greater: maximum speed reached
on go-around before high-lift devices can be retracted, or
1.8V s with high-lift devices in intermediate [not defined]
position.
VBM Volatile bulk memory.
VBMC Virtual battlefield management center.
VBO Velocity at burnout.
V BR 1 Speed for best range.
2 Limiting IAS for use of airbrake.
V BROC ASIR for best rate of climb of helicopter, usually
at or near SL.
VBS Visual bootstrapping subsystem.
VBV Variable-bypass valve.
VBW 1 Vertikalbordwaffe, dispenser of attack payloads
(G).
2 Vertical ballistic weapon.
VC 1 US military aircraft prefix, staff/VIP transport.
2 Variable-camber.
VCS
3 Vanadium carbide.
4 Or V c , velocity command.
5 Variable-cycle; E adds engine.
6 Vicinity (5–10 miles, or n.m., of airport).
7 Voice communication [many suffixes].
8 Vertical-cavity.
9 Vereinigung Cockpit eV [ALPA; office, D-60598
Frankfurt am Main] (G).
10 Virtual circuit.
11 Video cassette.
V c 1 Design cruising speed, usually one of speeds used
in establishing structural strength.
2 Relative closing speed between two aerial targets.
v c 1 Rate of climb (note: not IAS or other horizontal
speed in climb).
2 Circular velocity, satellite speed in linear measure.
VCAA Vintage and Classic Aeroplane Association.
VCAI Viable combat-avionics initiative, attempt to
study system life prior to procurement (USAF).
VCAS 1 Vice-Chief of the Air Staff.
2 Visual calibration augmentation system.
VCASS Visually coupled airborne systems simulator (a
helmet, Armstrong Lab.).
VCATS Visually coupled acquisition and targeting
system (HMD).
VCB Virtual-circuit bridge.
VCC 1 Vehicle-control centre.
2 Colour CRT display (F).
3 Voice communication control.
4 Video control centre, in pax cabin.
VCCO Voltage-controlled clock oscillator.
VCCS Voice communication[s] control system, or
switch.
VCD 1 Variable-capacitance diode.
2 Voltage-control, or -controlled, device.
VCDS Vice-Chief of the Defence Staff (UK).
VCE 1 Variable-cycle engine.
2 Virtual collaborative engineering.
VCFS Visually coupled flight system.
VCH Visual committal height.
VCID Voice-controlled, or command, interactive
device.
VCIR Vistal caesium IR.
VC/L Vehicle container/launcher (UAV).
VCM Visual countermeasures (OCM more usual).
VC max Active maximum-control speed.
VC min Active minimum-control speed.
VCN Visual computing network.
VCNTY Vicinity.
VCO 1 Variable clock, or controlled, oscillator.
2 Voltage-controlled oscillator.
V con Conventional flying qualities (STOVL aircraft).
VCOP Virtual-cockpit optimization program (USA).
VCOS 1 Vice-Chief of Staff.
VCO/S Voltage controller oscillator/synthesizer.
VCP Vehicle check point.
VCR 1 Video cassette recorder.
2 Visual control room, in tower.
3 Variable compression ratio.
4 Voice-command recognition.
VCRG V.h.f. Channel Requirements Group.
VCS 1 Vertical cross-section.
2 Vehicle control station, or system.
3 Voice communication switch, or system.
748