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<A name="[문서의 처음]"></A> Abbreviations(약어) AAS - Airport Advisory Service ABC - After Bottom Center AC - Alternating Current ACARS - ARINC Communications Addressing and Reporting System ACAS - Airborne Collision and Avoidance System ACDO - Air Carrier District Office ACLS - Automatic Carrier Landing System ACMI - Air Combat maneuvering Instrumentation ACT - Active Control Technology AD - Airworthiness Directive A/D - Analog-to-Digital ADC - Air Data Computer ADEU - Automatic Data Entry Unit ADF - Automatic Director Indicator ADI - Anti-detonation Injection ADI - Attitude Director Indicator ADIZ - Air Defense Identification Zone ADMA - Aviation Distributors and Manufacturers Association ADV - Air Defense Version AEW - Airborne Early Warning AF - Audio Frequency AFC - Automatic Frequency Control AFCS - Automatic Flight Control System A/FD - Airport / Facility Directory AFS - Automatic Flight System AGC - Automatic Gain Control AGL - Above Ground Level AGM - Air-to-Ground Missile AGS - Automatic Gain Stabilization AHRS - Attitude and Heading Reference System AID - Airport Information De나 AIDS - Airborne Integrated Data System AILS - Automatic Instrument Landing System AIM - Airman's Information Manual AIM - Avalanche-Induced Migration AIRMET - Airman's Meterological Information AIS - Airborne Instrumentation System ALARM - Air-Launched Anti-Radiation Missile Al-Gate MOS - Aluminum-Gate metal Oxide Semiconductor ALNOT - Alert Notice ALOFT - Airborne Light/Optical Fiber Technology ALRS - Arithmetic and Logic Register Stack ALS - Approach Light System ALTRV - Altitude Reservation ALU - Arithmetic and Logic Unit AM - Amplitude Modulated AN - Air Force-Navy AOSS - After Over Station Sensor AP - Autopilot APFDS - Autopilot and Flight Director System APMS - Automatic Performance and Management System APS - Altitude Preselect APSB - Altitude Preselect Bracket APU - Auxiliary Power Unit ARAC - Army Radar Approach Control ARINC - Aeronautical Radio Incorporated ARSA - Airport Radar Service Area ARSR - Air Route Surveillance Radar ARTC - Air Route Traffic Control ARTCC - Air Route Traffic Control Center AS, A/S - Airspeed ASA - Auto-land Status Annunciator ASARS - Advanced Synthetic Aperture Radar System ASCR - Asymmetrical Silicon Controlled Rectifier ASDE - Airport Surface Detection Equipment ASI - Airspeed Indicator ASR - Airport Surveillance Radar ASRAAM - Advanced Short Range Air-to-Air Missile ASTM - American Society for Testing Materials ASW - Anti-Submarine Warfare AT - Auto Throttle ATA - Actual Time of Arrival ATA - Air Transort Association ATC - After Top center ATC - Air Traffic Control ATC - Approved Type Certificate ATCAA - Air Traffic Control Assigned Airspace ATCCC - Air Traffic Control Command Center ATCRBS - Air Traffic Control Radar Beacon System ATCT - Air Traffic Control Tower ATD - Actual Time of Departure ATE - Automatic Test Equipment ATIS - Automatic Terminal Information Service ATLAS - Abbreviated Test Language for Avionics System ATM - Aerodynamic Twisting Moment ATOL - Automatic Test-Oriented Language ATRS - Automated Radar Terminal System ATS - Automatic Throttle System AT/SC - Auto Throttle / Speed Control AWG American Wire Gage BA - Bank Angle BB - Bar Bias B/B - Back Beam BBC - Before Bottom Center BBD - Bucket Brigade Device B/C, BC or B/CRS - Back Course BCSL - Base-Current Switch Logic B/D - Bottom of Descent BeAMOS - Beam-Addressed Metal Oxide Semiconductor BFET - Bipolar Field Effect Transistor BFL - Buffered Field Effect Transistor Logic BFO - Beat Frequency Oscillator BIGFET - Bipolar Insulated Gate Field Effect Transistor BIMOS - Bipolar Metal Oxide Semi-conductor BITE - Built-In Test Equipment BML - Bipolar Memory, Linear BOP - Bipolar Operational Power BORAM - Block Oriented Random Access Memory BSR - Bit Shift Resistor BTC - Before Top Center Btu - British Thermal Unit BU - Buffer Unit CAD - Computer-Aided Design CAP - Civil Air Patrol CAP - Combat Air Patrol CAS - Calibrated Airspeed CAT - Clear Air Turbulence CAT Ⅱ - Category Ⅱ CCCI or C3I - Command, Control, Communications, Intelligence CCIP - Continuously-Computed Impact Point CDI - Course Deviation Indicator CDU - Control / Display Unit CG - Center of Gravity CHT - Cylinder Heat Temperature CLOS - Command to Line of Sight CMCS - Central Maintenance Computer System COMED - Combined Map and Electronic Display COS/MOS - Complementary Oxide Silicon/Metal Oxide Silicon CP - Control Panel CPU - Central Processor Unit CROM - Control and Read-Only Memory CRT - Cathode ray Tube CS - Course Select CSD - Constant Speed Drive CSEU - Control System Electronic Unit CSL - Current-Sinking Logic CT - Control Transformer CTAF - Common Traffic Advisory Frequency CTD - Charge Transfer Device CTL - Complementary Transistor Logic CTM - Centrifugal Twisting Moment CVFP - Charted Visual Flight Procedure CVR - Cockpit Voice Recorder CW - Caution and Warning CWA - Center Weather Advisory CWS - Control Wheel Steering CWSU - Center Weather Service Unit DA - Drift Angle D/A - Digital to Analog Converter DAC - Data Aquisition Display DADC - Digital Air Data Computer DAIR - Direction Altitude and Identity Readout DAR - Data-Access Register DBS - Doppler Beam Sharpening DC - Direct Current DCC - Discrete Component Circuit DCFL - Direct-Couple Field Effect Transistor Logic DCL - Direct-Coupled Logic DCTL - Direct-Couple Transistor Logic DDI - Dual Distance Indicator DDS - Digital Display System DF - Direction Finder DFDAU - Digital Flight Data Acquisition Unit DFDR - Digital Flight Data Recorder DG - Directional Gyro D/G - Driver/Gate DH - Decision Hight DI - Digital Interface DIAS - Digital Avionics Information System DIC - Digital Integrated Circuit DIFCS - Digital Integrated Flight Control System DIL - Dual In-line DIP - Dual In-line Package DLC - Direct Lift Control DMA - Direct Memory Access DMAP - Digital Modular Avionics Program DMC - Direct Memory Channel DME - Distance Measuring Equipment DMLS - Doppler Microwave Landing System DMM - Digital Multimeter DMOS - Double-diffused Metal Oxide Semiconductor DOD - Department of Defense DOT - Department of Transportation DP - Differential Protection DCR - Dual Remote Compensator DSB - Double-Sided Board DSC - Digital-to-Synchro Converter DSM - Dynamic Scattering Mode DTG - Distance To Go DTL - Diode-Transistor Logic DU - Display Unit DUF - Diffusion Under Epitaxial Film DVFR - Defense Visual Flight Rules DVM - Digital Voltmeter EMSAW - En-route Minimum Safe Altitude Warning EADI - Electronic Attitude Director Indicator EAROM - Electrically Alterable Read Only Memory EARTS - En-route Automated Radar Tracking System EAS - Equivalent Airspeed EBCDIC - Extended Binary Coded Decimal Interchange Code ECAM - Electronic Centralized Aircraft Monitor ECCM - Electronic Counter Countermeasure ECL - Emitter-Coupled Logic ECM - Electronic Countermeasure ECS - Environmental Control System ECTL - Emitter-Coupled Transistor Logic EDCT - Expect Departure Clearance Time EDPS - Electronic Data Processing System EEC - Electronic Engine Control EE-PROM - Electrically Erasable Programmable Read Only Memory EFAS - En-route Flight Advisory Service EFIS - Electronic Flight Instrument System EFL - Emitter-Follower Logic EGT - Exhaust Gas Temperature EHS - Extremely High Frequency EHSI - Electronic Horizontal Situation Indicator EHSV - Electro-Hydraulic Servo Valve EIA - Electronic Industries Association EICAS - Engine Indicating and Crew Alerting System EIU - EFIS/EICAS Interface Units ELT - Emergency Locator Transmitter EMI - Electromagnetic Interference EMP - Electromagnetic Pulse EO - Electro-Optical EPR - Engine Pressure Ratio EPROM - Erasable Programmable Read Only Memory ERU - Explosion Release Unit ESD - Electrostatic Discharge ETA - Estimated Time of Arrival ETD - Estimated Time of Departure ETE - Estimated Time of En-route EXLOC - Extended Localizer FA - Area weather forecast FAA - Federal Aviation Administration FAC - Flight Augmentation Computer FAD - Fuel Advisory Departure FADEC - Full-Authority Digital Engine Control FAE - Fuel-Air Explosive FAF - Final Approach Fix FAMOS - Floating-gate Avalanche-injection Metal Oxide Semi-conductor FAO - Finish All Over FAR - Federal Aviation Regulations FAWP - Final Approach Waypoint FBO - Fixed Base Operator FCC - Federal Communications Commission FCC - Flight Control Computer FCES - Flight Control Electronic System FCEU - Flight Control Electronic Unit FCU - Flight Control Unit FCU - Fuel Control Unit FD - Flight Director FD - Winds and temperature aloft forecast FDE - Flight Deck Effect FDEP - Flight Data Entry Panel FDS - Flight Display Screen FED - Field Effect Device FET - Field Effect Transistor FF - Feeder Fault FGS - Flight Guidance System FIFO - First-In First-Out FIM - Fault Isolation Monitoring FIR - Flight Information Region FIS - Flight Instrument System FL - Flight Level FLIR - Forward-Looking Infra-Red System FM - Fan marker FM - Frequency Modulation FMA - Flight Mode Annunciator FMC - Flight Management Computer FMCS - Flight Management Computer System FMCU - Flight Management Computer Unit FMS - Flight Management System FOD - Foreign Object Damage FODTS - Fiber-Optic Data Transmission System FPC - Fuel Performance Computer FPLA - Field-Program Logic Array FPM - Flap Position Module F-PROM - Field-Programmable Read Only Memory FRC - Full Route Clearance FSDO - Flight Standards District Office FSEU - Flap/Slot Electronic Unit FSS - Flight Service Station FT - Terminal weather Forecast FTR - Force Trim Release FVC - Frequency-to-Voltage Converter FWC - Flight Warning Computer GA - General Aviation GA - Go Around GaAsFET - Gallium-Arsenic Field Effect Transistor GADO - General Aviation District Office GCA - Ground Controlled Approach GFET - Gate Field Effect Transistor GMT - Greenwich Mean Time GOES - Geostationary Operational Environmental Satellite GPO - Government Printing Office GPWS - Ground Proximity Warning System GS - Glide Slope GS - ground Speed GSE - Ground Support Equipment GTOSCR - Gate and Turn-Off Silicon Control Rectifier HAA - Hight Above Airport HARM - High-speed Anti-Radiation Missile HARS - Heading and Attitude Reference System HAT - Height Above Touchdown HCMOS - High-density Complementary Metal Oxide Semiconductor HF - Hight Frequency HIC - Hybrid Integrated Circuit HIIC - High-Isolation Integrated Circuit HIRL - High Intensity Runway Lighting HIWAS - Hazardous In-flight Weather Advisory Service HLTTL - High-Level Transistor-Transistor Logic HMOS - High-performance Metal Oxide Semiconductor HNIL - High Noise Immunity Logic HOBOS - Homing Bomb System HOTAS -Hands-on-Throttle-and-Stick HS - Heading Select HSI - Horizontal Situation Indicator HTFD - Hybrid Thick Film Device HTL - High Threshold Logic HUD - Head-Up Display HVPS - High-Voltage Power Supply Hz -Hertz IA - Inspection Authorization IAF - Initial Approach Fix IAP - Instrument Approach Procedure IAPS - Integrated Avionics Processor System IAS - Indicated Airspeed IAWP - Initial Approach Waypoint IC - Integrated Circuit ICAO - International Civil Aviation Organization ICU - Instrument Comparator Unit IDG - Integrated Drive Generator IDS - Integrated Display System IDS - Interdiction Strike IEPR - Integrated Engine Pressure Ratio IF - Intermediate Frequency IFF - Identification-Friend or Foe IFIM - International Flight Information Manual IFR - Instrument Flight Rules IFSS - International Flight Service Station IGFET - Insulated Gate Field Effect Transistor IHS - Integrated Heat Sink IIL or I2L - Integrated Injection Logic IIR - Imaging Infra-Red ILP - Integral Lead Package ILS - Instrument Landing System ILSOC -Instrument Landing System On Course IM - Inner Marker IMC - Instrument Meterological Condition IMPATT - Impact Avalanche Transit Time IMU - Inertial Measuring Unit IN.HG. - Inches of Mercury INREQ - Information Request INS - Inertial Navigation System INT - Intersection INWP - Intermediate Waypoint I/O - Input/Output IOC - Input/Output Concentrator IR - IFR Military Training Routes IRAN - Inspect and Repair As Necessary IRMP - Internal Reference Mode Panel IRS - Inertial Reference System IRU - Inertial Reference Unit ISA - International Standard Atmosphere ISIS - Integrated Sight and Interception System ISS - Inertial Sensing System ISS - Instrument Source Select IVS - Instantaneous Vertical Speed IVSI - Instantaneous Vertical Speed Indicator IVV - Instantaneous Vertical Velocity JATO - Jet Assisted Takeoff JFET - Junction Field Effect Transistor kHz - Kilohertz KVAR - Kilovolt-Amps Reactive LAAS - Low Altitude Alert System LANTIRN - Low-Altitude Navigation Targeting Infra-Red for Night LAPADS - Light-weight Acoustic Processing and Display System LAPUT - Light-Activated Programmable Unijunction Transistor LARAM - Light-Addressed Random Access Memory LASCAR - Light-Activated Silicone Control Rectifier LAU - Linear Accelerometer Unit LAWRS - Limited Aviation Weather Reporting Station LBS - Lateral Beam Sensor LCD - Liquid Crystal Display LDA - Localizer-type Directional Aid LED - Light Emitting Diode LEMAC - Leading Edge of the Mean Aerodynamic Chord LERX - Leading Edge Root Extensions LF - Low Frequency LFR - Low-Frequency Radio Range LGB - Laser-guided Glide Bombs LIC - Linear Integrated Circuit LIFO - Last In First Out LINS - Laser Inertial Navigation System LL - Logic Level LLTV - Low-Light Television LMM - Compass Locator at the Middle Maker LNAV - Lateral Navigation LOC - Localizer LOCMOS - Local Oxidation Complementary Metal Oxide Semiconductor LOM - Compass Locator at the Outer Marker LORAN - Long Range Navigation LRCO - Limited Remote Communications Outlet LRMTS - Laser Ranger and Marked Target Seeker LRRA - Low-Range Radio Altimeter LRU - Line Replaceable Unit LSI - Large-Scale Integration LSIA - Large-Scale Integration Array LSSAS - Longitudinal Static Stability Augmentation System LSU - Logic Switching Unit LVDT - Linear Voltage Differential Transducer LVPS - Low-Voltage Power Supply M - Mach number MAA - Maximum Authorized Altitude MAC - Mean Aerodynamic Chord MAD - Magnetic Anomaly Detector MAD - Mutually Assured Destruction MADGE - Microwave Aircraft Digital Guidance Equipment MALS - Medium Intensity Approach Light System MALSR - Medium Intensity Approach Light System with Runway alignment indicator light MALU - Mode Annunciation Logic Unit MAP - Mode Annunciator Panel MAR - Memory Address Register MARSA - Military Authority Assumes Responsibility for Separation of Aircraft MAW - Mission Adaptive Wing MAWP -Missed Approach Waypoint MCA - Minimum Crossing Altitude MCA - Multi-chip Array MCDP - Maintenance Control Display Panel MCP - Mode Control Panel MCU - Modular Concept Unit MCW - Modulated Continuous Wave MDA - Minimum Descent Altitude MEA - Minimum En-route Altitude MEAL - Micro-Extended Assembly Language MEK - Methyl Ethyl Ketone MF - Medium Frequency MFD - Multi-Function Display MHA - Minimum Holding Altitude MHz - Megahertz MIA - Minimum IFR Altitude MIC - Monolithic Integrated Circuit MICROM - Micro Instruction Control Read Only Memory MIP - Maintenance Information Printer MIR - Memory Information Register MIRL - Medium Intensity Runway Edge Light MIS - Meteorological Impact Statement MM - Middle Marker MOA - Military Operations Area MOCA - Minimum Obstruction Clearance Altitude MOD - Module MOSFET - Metal Oxide Silicon Field Effect Transistor MOSIC - Metal Oxide Silicon Integrated Circuit MOST - Metal Oxide Silicon Transistor MPH - Miles Per Hour MPU - Microprocessor Unit MRA - Minimum Reception Altitude MRV - Maximum Reverse Voltage MSA - Minimum Safe Altitude MSAW - Minimum Safe Altitude Warning MSI - Medium Scale Integration MSL - Mean Sea Level MST - Monolithic System Technology MSU - Mode Selector Unit MTBF - Mean Time Between Failure MTI - Moving Target Indicator MTL - Merger Transistor Logic MTOW - Maximum Take-Off Weight MTP - Maintenance Test Panel MTR - Military Training Route MVA - Minimum Vectoring Altitude MWS - Master Warning System N1 - RPM of low-pressure compressure N2 - RPM of high-pressure compressure NACA - National Advisory Committee for Aeronautical NAS - National Airspace System NASA - National Aeronautics and Space Administration NATO - North Atlantic Treaty Organization NAVAID - Navigational Aid NAVWASS - Navigation and Weapon-Aiming Sub System NAWAU - National Aviation Weather Advisory Unit NBC - Nuclear-Biological-Chemical NC - No Connection NC - Normally Closed NCD - No Computed Data NCU - Navigation Computer Unit ND - Navigation Display NDB - Non-Directional Beacon NDRO - Non-Destructive Readout NESDIS - National Environmental Satellite Data and Information Service Nf - RPM of free turbine NFDD - National Flight data Digest N-FET - N-type conduction Field Effect Transistor NHC - National Hurricane Center NMC - National Metal Oxide Silicon NOAA - National Oceanic and Atmospheric Administration NOC - NAV On Course NOPT - No Procedure Turn Required NORDO - No Radio NOTAM - Notice To Airmen NSSFC - National Severe Storms Forecast Center NTSB - National Transportation Safety Board NWS - National Weather Service OAT - Outside Air Temperature OBS - Omni Bearing Selector OC or O/C - On Course OCU - Operational Conversion Unit OEI - One Engine Inoperative OF - Over Frequency OM - Outer Marker ONS - Omega Navigation System OPAMP - Operational Amplifier OSS - Over Station Sensor OV - Over Voltage PAFAM - Performance and Failure Assessment Monitor PAM - Pulse Amplitude Modulation Pam - Ambient Pressure PAR - Precision Approach Radar PAS - Performance Advisory System PATT - Pitch Attitude PATWAS - Pilots Automatic Telephone Weather Answering Service PB - Burner Pressure PBB - Pitch Bar Bias PBCT - Proposed Boundary Crossing Time PCA - Power Control Actuator PCA - Positive Control Area PCB - Plenum Chamber Burning PCB - Printed Circuit Board PCCD - Profiled Charge-Coupled System PCM - Pulse-Code Modulation PCPL - Pitch Couple PCWS - Pitch Control Wheel Steering PDCS - Performance Data Computer System PDO - Phosphorus-Doped Oxide PDU - Pilot's Display Unit PECO - Pitch Erection Cutoff PELS - Precision Emitter Location System PFD - Primary Flight Display P-FET - P-type conduction Field Effect Transistor P Hold - Pitch Hold Phot-SCR - Photosensitive Silicon Control Rectifier PIDP - Programmable Indicator Data Processor PIREP - Pilot Weather Report PIU - Peripheral Interface Unit PJFET - P-type Junction-conduction Field Effect Transistor PLA - Programmable Logic Array PLA - Power Lever Angle PLL - Phase-Locked Loop PM - Phase Modulated PMOS - P-type Metal Oxide Silicon PMS - Performance Management System PNCS - Performance Navigation Computer System PND - Primary Navigation Display POS - Present Position PPI - Plan Position Indicator PPM - Pulse Position Module PPM - Parts Per Million PRAM - Programmable Analog Module PRF - Pulse Repetition Frequency PROM - Programmable Read Only Memory PRR - Pulse Repetition Rate PS - Power Supply PSAS - Pitch Stability Augmentation System psi - Pound per square inch psia - Pound per square inch, absolute psid - Pound per square inch, differential psig - Pound per square inch, gage PSL - Polycrystalline Silicon Layer PSM - Power Supply Module PSO - Phase Shift Oscillator PSU - Passenger Service Unit PSU - Power Supply Unit P SYNC - Pitch Synchronization PT - Total Pressure PT - Procedure Turn PTD - Propagation Time Delay PTH - Plated-Through Hole PTM - Pulse Time Modulation PWI - Proximity Warning Indicator PWR - Power QAR - Quick Access Recorder QECA - Quick Engine Change Assembly RA - Radio Altimeter RADAR - Radio Detection And Ranging RAIL - Runway Alignment Indicator Light System RALU - Register and Arithmetic Logic Unit RAM - Random Access Memory RAPCON - Radar Approach Control RAREP - Radar Weather Report RAS - Random Access Store RAT - Ram Air Turbine RATO - Rocket Assisted Take Off RBA - Radio Bearing Annunciator RBB - Roll Bar Bias RBN - Radio Beacon RR - Road Reconnaissance RCAM - Runway Center Line Markings RCPL - Roll Coupled RCR - Runway Condition Reading RCTL - Resistance-Coupled Transistor Logic RCVR - Receiver RCWS - Roll Control Wheel Steering RDF - Radio Direction Finder RDMI - Radio Direction Magnetic Indicator REIL - Runway End Identification Light REV/C - Reverse Course RF - Radio Frequency RF CYCLE - Refresh Cycle R/HOLD - Roll Hold RLC - Radial Lead Capacitor RLS - Remote Light Sensor RMI - Radio Magnetic Indicator RN/APPR - Area Navigation Approach RNAV - Area Navigation ROM - Read Only Memory RPM - Revolution Per Minute RR - Low-or Medium-frequency Radio Range RRLS - Remote Light Sensor RSAS - Roll Stability Augmentation System RSS -Relaxed Static Stability RSU - Remote Switching Unit R/T - Receiver/Transmitter RTL - Resistor-Transistor Logic RTU - Radio Tuning Unit RVDT - Rotary Voltage Differential Transmitter RVR - Runway Visual Range RVV - Runway Visibility Values R/W - Read/Write RWR - Radar Warning Receiver SA -Surface Aviation Weather Report SAE - Society of Automotive Engineers SAI - Standby Attitude Indicator SALS - Short Approach Lighting System SAM - Stabilizer Aileron Module SAM - Surface to Air Missile SAR - Search and Rescue SAR - Synthetic Aperture Radar SARB - Search and Rescue Beacon SARH - Semi-Active Radar Homing SAS - Stability Augmentation System SAWRS - Supplemental Aviation Weather Reporting Station SBS - Silicon Bilateral Switch SCAT - Speed Command Differential Transmitter SCM - Spoiler/Speed brake Control Module SCR - Silicon Control Rectifier SDC - Synchro-to-Digital Converter SDF - Simplified Directional Facility SELCAL -Selective Calling SEM - Scanning Electron Microscope SFA - Single Frequency Approach SFCC - Slat/Flap Control Computer SFO - Simulated Flameout SFSS - Satellite Field Service Station SG - Symbol Generator SGU - Symbol Generator Unit SHF - Super-High Frequency SHORAN - Short Range Navigation SIC - Silicon Integrated Circuit SID - Standard Instrument Departure Si-gate MOS - Silicon-gate Metal Oxide Silicon Semiconductor SIGMET - Significant Meteorological Advisory SIL - Single In-Line SIP - Single In-Line Package SLAMMR -Side-Looking Advanced Multi-mode Maritime Radar SLAR - Sideways Looking Airborne Radar SMI - Static Memory Interface S/N RATIO - Signal-to-Noise Ratio SOS - Silicon on Sapphire SPAN - Stored Program Alphanumeric SR - Status Register SRD - Shift Register Decoder SRP - Selected Reference Point SRT - Shift Register Transistor SS - Slow Slew SSALS - Simplified Short Approach Light System SSALSR - Simplified Short Approach Light System with runway alignment indicator light SSB - Single Sideband SSCT - Solid-State Control Transformer SSD - Static Sensitive Device SSEC - Static Source Error Correction SSR - Solid State Relay STAR - Standard Terminal Arrival Route STC - Sensitivity Time Control STC - Supplemental Type Certificate STCM - Stabilizer Trim Control Module STOL - Short Takeoff and Landing STOVL - Short Takeoff, Vertical Landing STS - Status STTL - Schottky Transistor-Transistor Logic SWAP - Service Weather Avoidance Plan TACAN - Tactical Air Navigation TACEVAL‎ - Tactical Eval‎uation TADS - Target Acquisition and Designation System TAF - Terminal Aviation Forecast TANS - Tactical Air Navigation System TAS - True Airspeed TBO - Time Between Overhauls T/C - Top of Climb TCA - Terminal Control Area TCC - Thrust Control Computer TCDS - Type Certificate Data Sheet TCH - Threshold Crossing Height TCS - Touch Control Steering T/D - Top of Descent TDC - Top Dead Center TDM - Time-Division Multiplex TDZE - Touchdown Zone Elevation TEMAC - Trailing Edge of Mean Aerodynamic Chord TEREC - Tactical Electronic Reconnaissance TERPS - Terminal Instrument Procedures TET - Turbine Entry Temperature TFHC - Thin-Film Hybrid Circuit TFR - Terrain Following Radar TFT - Thin-Film Transistor TGT - Turbine Gas Temperature THB - Through-Hole Board TIAS - True Indicated Airspeed TIT - Turbine Inlet Temperature TKE - Track Angle Error TMC - Thrust Management Computer TMS - Thrust Management System TMSP - Thrust Mode Selector Panel TOW - Tube launched, Optically-tracked, Wire-guided TRACON -Terminal Radar Control TRL - Transistor-Resistor Logic TRP - Thrust Rating Panel TRP - Time Replacement Parts TRSA - Terminal Radar Service Area TSO - Technical Standard Order TSO - Time Since Overhaul TSU - Telescopic Sighting Unit TT - Total Temperature TTG - Time to Go TTL - Tuned To Localizer TTL - Transistor-Transistor Logic TVOR - Terminal VOR TWEB - Transcribed Weather Broadcasting TWR - Turbulence-detecting Weather Radar TWS - Track While Scan TWT - Traveling Wave Tube TWU - Tactical Weapons Unit UA - Pilot Report(PIREP) UART - Universal Asynchronous Receiver Transmitter UF - Under Frequency UFET - Unipolar Field Effect Transistor UHF - Ultra-High Frequency UJT - Unijunction Transistor UK - United Kingdoms UNICOM - Universal Communication UV - Under Voltage V1 - Takeoff decision speed V2 - Minimum takeoff safety speed V2min - Minimum takeoff safety speed VA - Design maneuvering speed VAR - Volt-Amps Reactive VAS - Visual Augmentation system VASI - Visual Approach Slope Indicator VB - Design speed for maximum gust intensity VBS - Vertical Beam Sensor VC - Design Cruise speed VCO - Voltage-Controlled Oscillator VD - Design diving speed VDF/MFC - Demonstrated flight diving speed VDP - Visual Descent Point VDU - Visual Display Unit VF - Design flap speed VFC/MFC - Maximum speed for stability characteristics VFC - Voltage to-Frequency Converter VFE - Maximum flap-extended speed VFR _Visual Flight Rules VG - Variable Geometry VGU - Vertical Gyro Unit VH - Maximum level flight speed with continuous power VHF - Very High Frequency VLO - Maximum landing gear operating speed VLOF - Lift-off speed VMC - Minimum control speed with critical engine out VMC - Visual Meteorological Condition VMO/MMO - Maximum operating limit speed VMOS - Vertical Metal Oxide Semiconductor VMU - Minimum unstick speed VNAV -Vertical Navigation VNE - Never-exceed speed VNO - Maximum structural cruising speed VOM - Volt-Ohm-Milliammeter VOR -Very-high frequency Omni-directional Range VOR APPR - VOR Approach VOR OC - VOR On Course VORTAC - Colocated VOR and TACAN VOT - VOR Test Signal VR - Rotating speed VR - Volts Regulated VS - Stalling speed, or the minimum steady flight speed at which the airplane is controllable VS - Vertical Speed VSCU - Vertical Signal Conditioner Unit VSI - Stalling speed for a specified flight configuration VSO - Stalling speed in the landing configuration VSTOL - Vertical, or Short Take Off and Landing VTL - Variable Threshold Logic VTOL - Vertical Take Off and Landing VTOSS - Takeoff safety speed for Category A rotorcraft VX - Speed for best angle of climb VY - Speed for best rate of climb WA - AIRMET WD - Wind Direction angle WO or W/O - Washout WPT - Waypoint WS - SIGMET WS - Wind Speed WSFO - Weather Service Forecast Office WSO - Weather Service Office WST - Convective SIGMET WW - Server Weather Watch WXR - Weather Radar Transceiver XMOS - High Speed Metal Oxide Semiconductor XTK DEV - Cross Track Deviation YD - Yaw Damper YDM - Yaw Damper Module Z - Zulu Time(Greenwich Mean Time)