UR  Utilization Rate 
US  United States 
US  Under Speed 
US  Upstream 
USB  Universal Serial Bus 
USB  Upper Side Band 
UTA  Upper Control Area 
UTC  Universal Time Coordinated 
UUT  Unit Under Test 
UV  Under Voltage 
UV  Ultra-Violet 
UVEROM  Ultra Violet Erasable Read Only Memory 
UWY  Upper Airway 
U/FLOOR  Underfloor 
U/S  Unserviceable 
V  Violet 
V  Volt, Voltage 
V  Valve 
V1  Critical Engine Failure Speed 
V1  Decision Speed 
V2  Takeoff Safety Speed 
V2min  Minimum Takeoff Safety Speed 
V3  Flap Retraction Speed 
V4  Slat Retraction Speed 
VA  Design Maneuvering Speed 
VA  Heading with an Altitude Termination 
VAC  Voltage Alternating Current 
VACBI  Video and Computer-Based Instruction 
VACU  Vacuum 
VALDN  Validation 
VAP  Visual Approach Procedure 
VAR  Variable, Variation 
VAR  Visual-Aural Radio Range 
VAR LEV HTY  Variable Lever Healthy 
VASIS  Visual Approach Slope Indicator System 
VB  Design Speed for Maximum Gust Intensity 
VBV  Variable Bleed Valve 
VC  Design Cruising Speed 
VC  Ventilation Controller 
Vc  Calibrated Airspeed 
VCC  Video Control Center 
VCM  Video Camera Module 
VCO  Voltage Controlled Oscillator 
VCP  Video Control Panel 
VCS  Ventilation Control System 
VCTREND  Airspeed Tendency 
VCU  Video Control Unit 
VD  Heading to a DME Distance 
VD  Design Diving Speed 
VDC  Voltage Direct Current 
VDEV  Vertical Deviation 
VDF  Very High Frequency Direction Finding Station 
VDFMDF  Demonstrated Flight Diving Speed 
VDOS  Vendor Documentation On-line Service 

VDR  VHF Data Radio 
VDU  Video Display Unit 
VEADB  Video on demand Enhanced Area Distribution Box 
VEL  Velocity 
VENT  Ventilation 
VERT  Vertical 
VERT REV  Vertical Revise 
VF  Design Flap Speed 
VFCMFC  Maximum Speed for Stability Characteristics 
VFE  Maximum Flap Extended Speed 
VFEN  Predictive VFE at next flap/slat position