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visual separation
generated (but in old simulators achieved by optics moved
over a large model).
visual separation Basic method of avoiding collisions in
TMAs or on ground by seeing and avoiding; normally
involves conflicts between arrivals and departures and can
be accomplished by pilot action or tower instruction.
VIT Vision in turn.
vital actions Rigorously learned sequences instilled into
all pilots, either specific to type or, more often, as general
good airmanship; necessary eg before entering aircraft,
upon entering cockpit, on starting engine, before taxiing,
before takeoff, etc. On simple aircraft generally remembered
by mnemonics, eg Bumpf (check brakes, u/c,
mixture, pitch, flaps) or HTMPFFG (hood/harness,
trim/throttle friction, mixture, pitch, fuel cocks, flaps,
gills/gyros).
vital area Designated area or installation to be defended
by air-defense units (DoD).
vital items See essential items.
VITC Vertical-interval time code.
Vitreloy Dense ‘metallic glass’ (proprietary, Howmet).
vitrifying Transformation of ceramic from crystalline
phase into amorphous or glassy state.
Vitro-Lube Ceramic-bonded dry-film lubricant with
wide temperature range.
VITS 1 Video-image tracking system.
2 Virtual integrated training system.
VIU 1 Video interface unit.
2 Voloclub Italiano Ultraleggeri [ultralight builders;
office I-20123 Milan] (Italy).
Vivid Video verification and identification.
V J Velocity of propulsive jet, normally measured relative
to vehicle.
VKIFD Von Kármán Institute for Fluid Dynamics
(Int.).
VKS Military space force[s] (R).
VL 1 Vertical landing, or lift, or launch.
2 Tunnel velocity × characteristic model length.
V/L VOR/localizer.
V L Relative velocity of flow on underside of aerofoil.
VLA 1 Very light aircraft.
2 Very large aircraft.
3 Vertical line array.
4 Variable lever arm (flight-control ratio changer).
VLAAS Vertical-launch autonomous attack system.
VLAC Vertical-Lift Aircraft Council (US Aerospace
Industries Association).
VLAD Vertical line-array Difar.
Vladimir Very-large-array demonstration imager for
IR.
VLAR Vertical [attitude] launch and recovery.
VLBI Very long baseline interferometry.
VLBTI Very-long-burning target indicator.
VLC Very low clearance.
VLCHV Very low cost harrassment vehicle.
V L / D , V l / d Best lift/drag speed.
VLE Virtual learning environment.
V LE Maximum speed with landing gear extended and
locked; flight manual specifies whether main gear only or
all units. Always significantly higher than V E values.
VLEA Very-long-endurance aircraft, powered by solar
cells charging fuel cell(s) for continuous flight of months
or years.
VLED Visible LED.
V MCG
VLES Very large eddy simulation.
VLF Vectored-lift fighter; also see next.
v.l.f. Very low frequency. See Appendix 2.
v.l.f. Omega Global system of long-range navigation
using v.l.f. radio.
V LG No longer used; was vague maximum landing- gear
speed, now replaced by V EI , V LE .
VLJ Very light jet [being defined from 2004].
VLNT Violent.
VLO Very low observability.
V LO 1 US term, maximum speed for landing-gear
operation; synonymous with UK V E .
2 Confusingly, also used to mean lift-off speed, in other
words V 2 .
V LOF Lift-off speed, at which aeroplane becomes
airborne; suggest = V T .
VLR 1 Very long range [1942–45, ranges today considered
modest].
2 Telecom code for long-range search/rescue aircraft.
3 Velocity/length Reynolds number.
4 Very light rotorcraft.
VLS 1 Visible light sensor.
2 Vertical launch system.
3 Veiculo Lancador de Satelittes (Brazil).
VLSI Very-large-scale integration.
VLSIC Very-large-scale integrated circuit.
VLSIPA Very-large-scale integration photonics
architecture.
VLTA Very-large transport aircraft.
VLV Valve.
VLY 1 Volley.
2 Valley.
VM, v.m. 1 Velocity modulation.
2 Voltmeter (also V/M).
3 Voter/monitor (also V/M).
4 Visual [target] marker.
5 Heading to a manual termination.
V M 1 Speed at which precipitation (esp. slush) drag is
maximum; always well below aquaplaning speed.
2 Design speed for bird-strike.
V m 1 Volume fraction of composite material occupied
by matrix.
2 Missile velocity.
V/M See VM(2), (3).
VMA Code, fixed-wing attack squadron (USMC).
VMAD 1 Vertically mounted accessory drive.
2 Video-motion anomaly detection.
V max Maximum CAS for clean aircraft.
VMC 1 Visual meteorological conditions.
2 Vehicle management computer.
V MC Minimum-control speed; more precisely specified
as following three entries:
V MCA Minimum speed at which aeroplane can be
controlled in air; defined as limiting speed above which it
is possible to climb away with not more than 5° bank and
with yaw arrested after suffering failure of critical engine
in takeoff configuration, with engine windmilling and c.g.
at aft limit. There are usually suggested limits of required
rudder-pedal force and on absolute value of *.
V MCG Minimum speed at which aeroplane can be
controlled on ground; defined as that above which pilot
can maintain directional control after failure of critical
engine without applying more than 70 kg pedal force,
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