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V MCL
without going off runway and if possible while holding
centreline, with 7+ kt crosswind and wet surface.
V MCL Minimum speed at which aeroplane can be
controlled in the air in landing configuration, while
applying maximum possible variations of power on
remaining engine[s] after failure of critical engine.
VMCL2 As above but with any two engines inoperative.
V MCP Speed, usually EAS, at maximum continuous
power in level flight; V H is more commonly used.
V MD Maximum permitted diving speed.
VMDI Vector miss-distance indicator.
VME 1 Virtual memory environment.
2 V.h.f. management entity [bus].
3 VersaModule Eurocard [bus].
V ME Airspeed of sailplane for maximum endurance.
VMECC Versa module Eurocard card cage.
VMEP Vibration management enhancement
program[me].
VMF 1 Code, fixed-wing fighter squadron (USMC).
2 Navy (USSR, R).
3 Variable message format.
VMFA Code, fixed-wing fighter/attack squadron
(USMC).
V MG Vertical main landing gear strut load at MRW and
with full aft c.g.
V min Minimum CAS for basic clean aircraft.
V M(LO) Minimum maneuver speed (US).
VMM 1 Veille Météorologique Mondiale = World
Weather Watch.
2 Vehicle management module.
VM3, VM 3 , VMMM Versatile mass media memory, 4
RTMMs.
VMO Variable metering orifice.
V MO Maximum permitted operating speed under any
condition, higher than V NE and less than V DF but latter is
wholly exceptional limit not intended to be reached except
during certification flying.
VMOS Virtual machine operating system.
Vmp Helicopter speed for minimum power.
Vmr Helicopter speed for maximum range.
VMS 1 Vehicle management system.
2 Vehicle monitoring system (robotics).
3 Vertical motion simulator.
4 Vehicle motion sensor.
5 Variable metering sleeve.
V MS 1 Minimum EAS observed during normal
symmetric stall, usually less than V s .
2 Airspeed for minimum sink rate in gliding flight.
VMTI Video moving-target indicator.
VMU 1 Voice management [or message] unit.
2 Velocity measurement unit.
3 Marine Air Group (USMC).
V MU Minimum demonstrated unstick speed, at which
with all engines operating, and without regard to safety,
noise-abatement or any other factor, aeroplane will leave
ground and hold positive climb. According to Airbus,
“vitesse minimum unstick”.
VN 1 Speed multiplied by (or plotted against) normal
acceleration; more commonly V-n.
2 Vinyl/nitrile (PVC nitrile-based rubber).
V n Component of wind acting perpendicular to
heading; also called normal wind, normal component or
(loosely) crosswind component.
V-n Flight speed (usually EAS) multiplied by or plotted
voice frequency
against normal acceleration; hence * diagram, of which
two forms; basic manoeuvring envelope and basic gust
envelope.
V NA Noise-abatement climb speed, usually synonymous
with V 4 (1st segment) but also commonly used for 4th
segment Fuss.
V-Nav, VNAV, V/NAV Vertical navigation; generalized
topic of control of flight trajectory in vertical plane; now
becoming automatic in transport-aircraft energymanaging
flight systems. In a specific system, an add-on
to LNAV giving glideslope guidance down to 350 ft AGL
(WAAS).
V NE Never-exceed speed; an exceptional permitted
maximum beyond V MO of which captain may avail
himself in unusual circumstances. Implication is that *
must be reported and explained.
VNII All-union research institute [EM adds electromechanics,
RA radio engineering] (R).
V90 Category of off-base airstrips usable by fighters
(Sweden).
VNIR Visible to near-IR.
V NO Maximum permitted normal-operating speed,
generally replaced by V MO ; in smooth air can be exceeded
‘with caution’.
VNR V.h.f. navigation receiver.
VNRT Very near real time.
VNTSC Volpe National Transportation Systems
Center (US DoT).
VNV ALPA (Netherlands).
VO 1 Visual optics.
2 US piston engine code, vertical crankshaft, opposed.
V o Operational speed (airspeed in FCS calculations).
VOA 1 Velocity of arrival.
2 Vsesoyuznoe Obshchestvo Aviastroitelei (aeronautical
society, USSR, R).
3 Volatile organic analyser.
VOB Vacuum optical bench.
VOC 1 Validation of concept.
2 Visual optical countermeasures.
3 Volatile organic compound[s].
V oc Obstacle-clearance speed.
Vocational Tax relief Granted by Inland Revenue
against cost of some commercial-pilot training (UK).
Vocoder Voice coder; device responding to spoken input
(usually previously stored) to generate synthetic speech
output.
VOCRAD Voice radio.
VOCS Voice-operated carrier suppressor.
VOD 1 Vertical-on-board delivery; usually synonymous
with vertrep.
2 Vertical obstruction data.
3 Video on demand.
Voder Device with keyboard input controlling generation
of electronic sounds, esp. synthetic speech output.
VODR Has been used to mean VOR.
VOF Volume of fluid.
VÖFVL Verband Österreichischer Flugverkehrsleiter
(Austria).
Vogad Voice-operated gain-adjusting device; auto
volume compressor or expander.
Voice Voice optimal interrogator (USN).
voice frequency Normally taken as 25 Hz to 3 kHz for
telecommunications, much greater range for hi-fi.
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