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V/P
VSD
3 Vector processor.
V RA Rough-air speed; maximum recommended EAS for
= K –– 2 ro
– 1 by suffix number, thus *-7 (NSA 1974–).
a – where K is constant, r o is distance to VRMT Virtual-reality maintenance trainer.
4 Video processor.
flight in turbulence.
5 Combat helicopter regiment (R).
VRAM Video random-access memory.
6 Validation parameter.
VRB 1 Voice rotating beacon.
V/P Vehicle or personnel deviation, any action that 2 Variable.
violates FARs.
VRBL, Vrbl Variable.
V p 1 Propellant volume; that volume occupied by solid VRC 1 Vendor reject crib.
propellant in a rocket motor.
2 Value relay centre (EC).
2 Propwash velocity, V + v.
VRD Virtual retinal display.
v.p. Vapour pressure.
V REF 1 Loosely, any reference, or ‘bug’, speed.
VPAC Vapour-phase aluminide coating.
2 In jet transports, a typical approach speed at about
V path Vertical path.
1.35 Vs0 (chiefly US).
VPC Vertical-path computer.
V rel Relative velocity.
VPD Virtual product design.
VRF Code: ferry squadron (USN).
VPDS Variable public display system.
VRG 1 Vertical reference gyro, = vertical gyro.
V % Best angle-of-climb speed (UK usage, US = Vx).
2 VDL(2) reference guide.
V %SE Best angle-of-climb speed, single-engine (UK). vrille Spin (arch.).
V peri Perigee velocity, maximum speed of satellite
VRK Very Restricted Knowledge, classification refined
VROC 1 Vertical rate of climb (helicopter).
centre of primary and a is semi-axis of elliptical orbit.
2 Validated rate of climb.
VPI 1 Vapour-phase inhibitor.
VRP 1 Visual reporting post or point.
2 Vertical-position indicator.
2 Visual refrence point, giving a fix.
VPM Virtual product management, or model.
VRPS Voice recording and playback system.
vpm, v.p.m. Vibrations per minute.
VPN
1 Vickers pyramid number.
2 Variable primary nozzle.
3 Virtual private network.
4 Vendor part number.
VPP Voluntary Protection Program (OSHA).
VPR Voice position report.
VPS Vacuum plasma spray.
VPTAR See Vaptar.
VPTS Voice-processing training system.
VPU 1 Video, or voice, processing unit.
2 Vortac position unit.
VPU(D) Voice processor unit with data mode.
VPVO Air-defence troops (R).
VR 1 Resultant velocity.
2 Vernier radial (thruster).
3 Visual reconnaissance.
4 Volunteer Reserve.
5 Veer[ring].
6 Visual route, rules or range.
7 Vortex ring.
8 Virtual reality.
9 Voice recognition.
10 Variable reluctance [much less common, variable
resistance].
V R 1 Rotation speed, at which PIC starts to pull back on
yoke to rotate aeroplane in pitch; normally determined by
one of following: not less than 1.05 V MCA ; not less than 1.1
V MS ; not less than 1.05 or 1.1 V MU ; and it must allow 1.1
V MCA or 1.2 V MS to be achieved at screen after one engine
failure.
2 Radar velocity, i.e., of aircraft in which it is
mounted.
3 Heading to a radial (US wording).
V r Radial velocity, eg component of velocity along
sightline to target (rate of change of range) or fluid
speed along radial direction in centrifugal compressor
measured relative to compressor (ie eliminating tangential
component).
VRA Variable-response [research] aircraft.
VRS
1 Video recording system.
2 Voice response system.
3 VTOL recovery and surveillance [aircraft] (USCG).
4 Vortex-ring state.
VRT Virtual-reality toolkit [& S adds and simulator].
VR(T) Volunteer Reserve (Training) (UK).
VRU Vertical reference unit.
VS 1 USN squadron code: fixed-wing ASW.
2 Vestigial sideband.
3 Velocity search (radar).
4 Vane set.
5 Vertical speed (also V/S, VSP).
6 Versus.
V s 1 Stalling speed; IAS at which aeroplane exhibits
characteristics or behaviour accepted as defining stall (in
US, FAA adds ‘or minimum steady flight speed at which
airplane is controllable’, which is not same thing and is
separately defined in UK as V MCA ). V s0 , V s1 see entries.
2 Velocity of slip (propeller).
3 Slipstream velocity, relative to aircraft.
4 Sink rate.
V/S Vertical speed.
VSA 1 By visual reference to ground (ICAO code).
2 Value-stream analysis.
VSAM Vestigial-sideband amplitude modulation.
VSAT, V-Sat Very small aperture terminal.
VSB 1 Vendor service bulletin.
2 Visible.
vsby Visibility.
VSC 1 Video scan converter.
2 Vacuum system control.
VSCAS Variable-stability control-augmentation
system.
VSCF Variable-speed constant-frequency.
VSCS 1 Voice switching and communications, or
control, system (FAA).
2 Vertical-stabilizer control system (Notar).
VSD 1 Vertical situation display.
2 Video symbology display.
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