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VCSD
4 Voice-controlled, or voice command, system.
5 Visually coupled system.
6 Video-camera station, or system.
7 Variable colour stripping.
VCSD Very-close-in ship defence.
VCSEL Vertical-cavity surface-emitting laser.
VCSELI VCSE laser-based interconnect[s].
VCSS 1 Vinyl-coated stainless steel.
2 Voice-controlled, or communication, switching
system.
VCSU Video-code suppression unit.
VCTA Visual circuit altitude.
VCTS Variable-cockpit training system.
VCU 1 Video conversion unit.
2 VDL(2) control unit.
VCXI Visual course cross-pointer indicator.
VCXO Voltage-controlled crystal oscillator.
VCY Vicinity.
VD 1 Video detector, or disk.
2 V.h.f. data.
3 Visual display.
4 Variable displacement.
V D 1 Design diving speed; highest speed at which
aircraft is normally permitted to fly, forming vertical
right-hand boundary to both basic manoeuvring envelope
and basic gust envelope. One of speeds used in establishing
structural strength.
2 Heading to a DME distance.
V d Doppler velocity [range rate].
v d Rate of descent (note: not airspeed during descent).
v.d. Vapour density.
VDA 1 Versatile drone autopilot.
2 Vehicule de défense anti-aérienne (F).
3 Vertical data analysis.
VDC 1 Variable-datum control.
2 Visual-display controller.
VDC, Vd.c. Volts direct-current.
VDD 1 Version description document.
2 Variable-drag drogue.
VDDL Verband Deutscher Drachenfluglehrer eV (kiteflying
instructors, G).
VDE Verein Deutscher Elektrotechniker (G, technical
society).
VDF 1 V.h.f. D/F; most common ground D/F.
2 Verein Deutscher Flugzeugführer (G, PIC society).
3 Verband Deutscher Flugleiter (G).
V DF Maximum demonstrated flight diving speed;
highest IAS at which aircraft is ever flown (normally only
during certification); associated with poor strength
margins (inadequate for severe gust) and possibly poor
handling, yet attainable at full power even in climb on
many transports at low/medium levels.
VDFT Verband Deutscher Flugsicherungs-Techniker
eV (flight-safety technicians, G).
VDGS Visual docking guidance system.
VDHM Variable-displacement hydraulic motor.
VDI 1 Vertical displacement indicator.
2 Variable-depth (sonar) output indicator.
3 Verband Deutscher Ingenieure [133,000 members;
office, D-40002 Düsseldorf] (G).
4 Vertical-deviation indication, or indicator.
V DIV Divergence speed, IAS at which the wing will fail
in torsion.
vector
VDL 1 Verband Deutscher Luftfahrt-Techniker (G,
aerospace engineers’ society).
2 V.h.f. data-link (Arinc), or digital link.
VDLM V.h.f. data-link Mode, followed by 1, 2, 3 or 4.
VDLU Verband Deutscher Luftfahrt-Unternehmen
(G).
VDM 1 Viscous damped mount.
2 Visual display module.
3 VSCS display module.
VDMA 1 Variable-destination multiple access.
2 Verein Deutscher Maschinenbau-Anstalten (G).
VDMD, Vdmd Demonstrated maximum diving speed.
VDNX, VDNKh Exhibition of national-economy
achievement (USSR).
VDO Virtual distant object.
VDP 1 Validation demonstration phase.
2 Visual descent point.
3 Variable-displacement pump.
VDR, v.d.r.1 Voltage-dependent resistor.
2 V.h.f. data, or digital, radio.
3 Variable-diameter rotor.
VDRS Vehicle data recorder system.
VDRT Visual display research tool.
VDS 1 Variable-depth sonar.
2 Video-disc simulation.
VDSM Very deep sub-micron.
VDT 1 Variable-discharge turbine (driven by pistonengine
exhaust).
2 Vapour-deposited tungsten.
3 Variable-deflection thruster.
4 Variable-density [wind] tunnel.
VDTR Variable-diameter tilt-rotor.
VDU Visual or video display unit.
VDVP Variable-displacement vane pump.
VE 1 Value engineering.
2 Visual exempt[ed].
V E Generalized symbalent airspeed.
2 Effective velocity ratio Vα /V j .
Vol for a limiting speed at which something (eg flap,
landing gear) may be selected and extended; suffixes, eg
V EI , V EN , used for specific items and additional terms are
used (more are needed) for limiting speeds for subsequent
retraction. Main gears (usually not nose) are generally
cleared to V MO when locked down, but V E always applies
for selecting down or up.
V e 1 EquivEB Vehicle equipment bay.
Vebal Vertical ballistic (downward-firing anti-armour).
VECP Value-engineering change proposal.
VECTOR, Vector Vectoring Estol control tailless operational
research (US/Germany).
vector 1 Adj, having both magnitude and direction; thus
velocity is * quantity, speed is not. Aerospace is normally
based on Euclidean geometry.
2 Line representing quantity’s magnitude, direction
and point of application, eg force on structure, or aircraft
heading/vertical velocity [if any] TAS.
3 A particular aircraft heading or track, eg that needed
to arrive at destination.
4 To issue headings to aircraft to provide navigation
guidance (DoD definition adds ‘by radar’).
5 On HUD, aircraft direction of travel, usually
synonymous with track.
6 To control trajectory by altering thrust axis of
propulsion.
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