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Aviation abbreviations and acronyms (u-v)

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Uniform
U/C  Under Carriage
U/FULL  Under Full
U/J  Universal Joint
U/S  Unserviceable
UAC  Upper Area Control Centre
UART  Universal Asynchronous Receiver/Transmitter
UDC  Upper Deck Cargo
UDL  Unit Detail Listing
UER  Unscheduled Engine Removal
UF  Under Frequency
Uplink Format
UFD  Unit Fault Data
UHF  Ultra High Frequency
UKCAA Civil Aviation Authority (UK)
ULB  Under Water Locator Beacon
ULD  Unit Loading Device
UM Unaccompanied Minor
UNA Unavailable
UNBAL  Unbalance
UNCPLG  Uncoupling
UNCRCTD  Uncorrected
UND  Under
UNIV  Universal
UNLK  Unlock
UNLKD  Unlocked
UNRGLTD  Unregulated
UNSCHD or UNSCHED Unscheduled
UNSD  Unused
UP  Unit Separator
Upper
Unknown Precipitation (automated stations only)
UPD  Update
UPLK  Uplock
UPR  Upper
UPR DSPL UPpeR DiSPLay
UPU Universal Postal Union
UR  Utilization Rate
US  Ultra Sonic
Under Speed
United States
USA  United States Of America
USB  Upper Side Band
USD  Us Dollar
USG  Us Gallon
USGAL  Us Gallon
USOAP Universal Safety Oversight Safety Program (ICAO)
USR Under Speed Relay
USS  Under Speed Sensor
UTA  Upper Control Area
UTC  Universal Time Coordinated (replaces former Gmt)
UTIL Utility
UUT  Unit Under Test
UV  Ultra Violet
UV  Under Voltage
UVEROM  Ultra Violet Erasable Read Only Memory
UWY  Upper Airway
 
Victor
Speed
Valve
V/B Vertical Bearing
V/S  Vertical Speed
V1 Critical engine failure recognition speed
Take off Decision Speed
V2 Take off safety speed
Take off screen speed
Scheduled Take off Target Speed
V2min minimum takeoff safety speed.
V3

Flap Retraction Speed
Steady initial climb speed with all engines operating

V4 Steady climb speed with all engines operating
Slat Retraction Speed
VA 

Cabin Temp Aft
Design Maneuvering Speed
Volcanic Ash

VAC  Vacuum
Voltage Alternate Current
Volts Alternating Current
VACBI  Video And Computer Based Instruction (Airbus)
VACC  Vertical Acceleration
VAL Valuable Cargo (IATA)
VAL or VLV Valve
VANP Vertical Actual Navigation Performance
VB  Design speed for maximum gust intensity
Valve Block
Vibration
VB1  N1 Vibration Engine
VB2  N2 Vibration Engine
V-BARS  Type Of Flight Director Indicator Pointers
VBE Best endurance speed
VBG Best power-off glide speed
VBS  Vertical Beam Sensor
VBV  Variable Bleed Valve
Variable Bypass Valve
VBVF  Variable Bleed Feedback
VC 

Calibrated Airspeed
Design Cruising Speed
in the ViCinity

Vclmax Maximum coefficient of lift Speed
VCTREND  Airspeed Tendency
VD Design diving speed
VDC  Voltage Direct Current
Volts Direct Current
VDEV  Vertical Deviation
VDF/MDF Demonstrated flight diving speed.
Vdmin Velocity m inimum drag
VDP Visual Descent Point
VEF Speed at which the critical engine is assumed to fail during takeoff.
VEL  Velocity
VENT  Ventilation
VERT  Vertical
VF Design flap speed
Cabin Temperature Forward
Ventricular Fibrillation
VFC/MFC maximum speed for stability characteristics.
VFE  Maximum Velocity Flaps Extended Speed
VFEN  Next Flap Extension Speed
Predictive Vfe At Next Flap/Slat Position
VFR  Visual Flight Rules
VFTO  Final Take Off Speed
VG  Vertical Gyro
VH Maximum speed in level flight with maximum continuous power
VHF  Very High Frequency
VHV  Very High Voltage
VIB  Vibration
Vimd or Vmd Minimum drag
Vimp Minimum power
VIS Visibility
VISNO_LOC automated stations equipped with a secondary visibility sensor have that sensor not operating
VISV  Variable Inlet Stator Vane
VLE  Maximum Landing Gear Extended Speed
VLF  Very Low Frequency
VLO Maximum landing gear operating speed
VLOF Lift-off speed
VLS  Lowest Selectable Speed
VLV or VAL Valve
VM  Recommended Maneuvering Speed
Voltmeter
VMAN  Maneuvering Speed
VMAX  Maximum Operating Speed
Vmbe Max brake energy speed
VMC Minimum control speed with the critical engine inoperative
VMCA Minimum Control Speed (air)
VMCG Minimum Control Speed (ground)
Vmcl Minimum control speed, approach and landing
Vmd Minimum drag
Vme Max endurance
VMIN  Minimum Operating Speed
VMO/MMO Maximum operating limit speed
Vmp Minimum power
Vmr Velocity max range
VMU Velocity minimum unstick speed
VNAV  Vertical Navigation
Vnd Maximum structural cruising speed
VNE Never-exceed speed
VNO Maximum structural cruising speed
VOL  Volume
VOR  Very High Frequency Omni Directional Range
VOR-D  Vor-Dme
VORTAC  Vor-Tacan
Vp Aquaplaning speed
VPSN  Valve Position
VR  Rotation Speed
VRNP Vertical Required Navigation Performqnce
Vra Rough air speed
VREF  Landing Reference Speed
VRTG  Body Normal Acceleration
Vs Velocity stall
VS or VS1 Stalling speed
Minimum steady flight speed
VS or VSPD Vertical Speed
VS0 Stalling speed
Minimum steady flight speed in the landing configuration.
Vs1g One g stall speed
VSC  Vacuum System Controller
VSCB  Cabin Vertical Speed
VSCF Variable Speed Constant Frequency
VSD Vertical Situation Display
VSI  Vertical Speed Indicator
VSL  Vertical Speed Limit
VSPD or VS Vertical SPeeD
VSR Reference stall speed
VSR0 Reference stall speed in the landing configuration.
VSR1 Reference stall speed in a specific configuration.
VSS  Stick Shaker Speed
Vsse Safe single engine speed
VSV  Compressor Stator Vane Actuator
Variable Stator Vane
VSW Speed at which onset of natural or artificial stall warning occurs
VSWR  Voltage Standing Wave Ratio
Vt Threshold speed
VTK Vertical Track
Vtmax max threshold speed
VTOSS takeoff safety speed for Category A rotorcraft.
VTR Video Tape Reproducer
VV  Vice Versa
Indefinite Ceiling
Vertical Visibility
VW  Cabin Temp
Vx Velocity b est angle of climb
VXSE or VXE Speed for best angle climb with the critical engine inoperative
VY Speed for best rate of climb
VYSE or VYE speed for best rate of climb with the critical engine inoperative

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