C
C Celsius
C Center (Runway ID)
C Central Standard Time (Time groups only)
C Circling (Approach and landing charts)
C Continental (Air mass)
C&A Certification and Accreditation
C/A Coarse/Acquisition
C/L Center Line
C/S/S/N Capacity/Safety/Security/Noise
CA Clear Above (PIREP only)
CA Conflict Alert
CAA Civil Aeronautics Administration
CAA Civil Airworthiness Authority
CAA Civil Aviation Authority
CAA Clean Air Act
CAAFI Commercial Aviation Alternative Fuels Initiative
CAAS Class A Airspace
CAASD Center for Advanced Aviation System Development
CAB Cabin
CAB Civil Aeronautics Board
CAC Change to Approach Control
CAC Changing to Approach Control
CAC Contact Approach Control
CAC Caribbean Aeronautical Chart
CACT Civil Air Carrier Turbojet
CAD Computer Aided Design
CAD Computer Aided Drawing
CAD/CAM Computer Aided Design and Manufacturing
CADO Chief, Airport District Office
CAEG Computer Aided Engineering Graphics
CAI Contractor Acceptance Inspection
CAIRS Cable Assignment Information Retrieval System
CALCM Conventional Air Launcehd Cruise Missile
CAM Canadian Armed Forces Transport Command
CAMI Civil Aerospace Medical Institute
CAN Canada
CANC Cancel
CANFORCE Canadian Armed Force
CANO Catalogue Number
CANOT Canadian NOTAM
CANR Canadian NORAD Region
CAO Change of Appointing Office
CAP Capture
CAP Civil Air Patrol
CAP Combat Air Patrol
CAP/IS Combined Approach Control/International Station
CAPD Climb at Pilot’s Discretion
CAPE Convective Available Potential Energy
CAPT Captain
CAR Civil Airworthiness Regulation
CAR Civil Aviation Regulations
CARA Check Area Airports
CARAT Center for Aviation Research and Aerospace Technology
CARF Central Altitude Reservation Facility
CARF Central Altitude Reservation Function
CARIB Caribbean
CARS Civilian Air Routes System
CARSR Common Air Route Surveillance Radar
CARTS Common Automated Radar Terminal System
CARU Canadian Airspace Reservation Unit
CAS Calibrated Airspeed
CAS Close Air Support
CAS Collision Avoidance System
CAS Cost Accounting System
CASA Controller Automated Spacing Aid
CASCDS Cascades
CASFO Civil Aviation Security Office
CASOM Conventional Armed Stand Off Missile
CASS Continuing Analysis and Surveillance System
CASST Commercial Aviation Safety Strategic Team
CAST Certification Authority Software Team
CASTLE Consolidated Automated System for Time and Labor Entry
CAT Category
CAT Clear Air Turbulence
CATTS Computerized Air Traffic Training System
CATX Categorical Exclusion
CATX Climb and Cross
CAU Crypto Ancillary Unit
CAUFN Caution Advised Until Further Notice
CAVOK Cloud and Visibility OK
CAVU Ceiling and Visibility Unlimited
CAWS Central Aural Warning System
CAWS Common Aviation Weather Subsystem
CB Circuit Breaker
CB Cumulonimbus
CBAS Class B Airspace
CBI Computer Based Instruction
CBMAM Cumulonimbus mamma
CBO Community Based Organization
CBS Cumulonimbi
CBSA Class B Surface Area
CC Carbon Copy
CC Cirrocumulus
CC Construction Coordinator
CC&O Customer Cost and Obligation
CCA Central Control Actuator
CCA Continental Control Area
CCAS Class C Airspace
CCC Central Computer Complex
CCC Communications Command Center
CCC Regional Communications Control Center
CCCC Staff Communications
CCCH Central Computer Complex Host
CCCI, C3I Command, Control Communications, Intelligence
CCD Charge Coupled Device
CCD City (or County) Civil Defense Director
CCFP Collaborative Convective Forecast Product
CCIP Continuously Computed Impact Point
CCL Convective Condensation Level
CCLDS Clear of Clouds
CCLKOB Counterclockwise Orbit
CCLKWS Counterclockwise
CCRU Complete Crew
CCRZ Climb and Cruise
CCS Cabin Configurations System
CCS7 NI Communication Channel Signal 7 Network Interconnect
CCSA Class C Surface Area
CCSD Command Communications Service Designator
CCSL Standing Lenticular Cirrocumulus
CCTLR Chief Controller
CCU Central Control Unit
CCUS Cleared Customs
CCV Control Configured Vehicle
CCW Counterclockwise
CD Candela
CD Civil Defense
CD Clearance Delivery
CD Common Digitizer
CD Compact Disc
CD Convergent Divergent
CDA Continuous Descent Arrival
CDA Controlled Diffusion Airfoil
CDAS Class D airspace
CDB Corporate Database
CDC Computer Display Channel
CDD Corporate Data Dictionary
CDFNT Cold Front
CDFNTL Cold frontal
CDI Course Deviation Indicator
CDL Configuration Deviation List
CDM Collaborative Decision Making
CDN Coordination
CDO Communications Duty Officer
CDR Cost Detail Report
CDRA Cooperative Research and Development Agreement
CD ROM Compact Disc Read Only Memory
CDS Central Dispatch System
CDSA Class D surface area
CDT Central Daylight Time
CDT Clearance Delivery Time
CDT Controlled Departure Time
CDTI Cockpit Display of Traffic Information
CDU Control/Display Unit
CDV Compressed Digital Video
CE Commercial Pilot Examiner
CE Communications Equipment
CEAS Class E Airspace
CED Categorical Exclusion Determination
CELNAV Celestial Navigation
CEMF Counter Electromotive Force
CENGR Civil Engineer
CENPAC Central North Pacific
CENRAP Center Radar Arts Presentation
CENRAP Center Radar Arts Processing
CENTX Central Telephone Exchange
CEP Capacity Enhancement Program
CEP Central East Pacific
CEQ Council on Environmental Quality
CER Climb En Route
CERAP Center Radar Approach Control
CERAP Central Radar Approach
CERAP Combined Center/RAPCON
CERT Certificate
CERTIF Certification
CESA Class E Surface Area
CF Change Frequency
CFA Controlled Firing Area
CFAD Composite Flight Data Processing
CFADC Canadian Forces Air Defense Command
CFAP Cleared for Approach
CFC Central Flow Control
CFCF Central Flow Control Facility
CFCF Central Flow Control Function
CFCS Central Flow Control Service
CFI Certified Flight Instructor
CFIT Controlled Flight Into Terrain
CFM Confirm
CFM Cubic Feet Per Minute
CFN Confine
CFP Cold Front Passage
CFPL Carryover From Previous Log
CFR Code of Federal Regulations
CFRP Carbon Fiber Reinforced Plastic
CFWP Central Flow Weather Processor
CFWSU Central Flow Weather Service Unit
CFWU Central Flow Weather Unit
CFY Clarify
CG Center of Gravity
CG Coast Guard
CGAS Class G airspace
CGAS Coast Guard Air Station
CGD Combined Graphic Display
CGL Circling Guidance Light
CGLS Coast Guard LORAN Station
CGSTN Congestion
CH Channel
CH Compass Heading
CH This is a channel continuity check of transmission to permit comparison of your record of channel sequence numbers of messages received on the channel
CHAP Chapter
CHARC Characteristic
CHC Chance
CHCS Chances
CHG Change
CHGD Changed
CHGG Changing
CHGO Changing Over
CHGR Charger
CHGS Changes
CHI Computer Human Interface
CHM Chemicals
CHNL Channel
CHOK Check Okay
CHOV Changeover
CHRG Charge
CHSPK Chesapeake
CHT Charter
CHTR Charter
CI Cirrus
CIC Cabin Interphone Controller
CIC Controller in Charge
CIDIN Common Data Interchange Network
CIFP Cancel IFR Flight Plan
CIFP Coded Instrument Flight Procedures
CIFR Cancel IFR Clearance Previously Given
CIFRR Common IFR Room
CIG Ceiling
CIGS Ceilings
CINCNORAD Commander in Chief, North American Aerospace Defense Command
CIO Chief Information Officer
CIP Capital Investment Plan
CIP Computer Icing Probability
CIRE Commercial and Instrument Rating Examiner
CIRNAV Circumnavigate
CIRNOT circuit notice
CIRVIS communications instructions for reporting vital intelligence sightings
CIS Commonwealth of Independent States
CISO Chief Information Security Officer
CIT Compressor Inlet Temperature
CIT Near or Over Large Towns
CIV Civil
CIWS Corridor Integrated Weather System
CK Check
CKT Circuit
CL Center Line
CL Closing Station
CL Course Line
CL Runway Centerline Lights
CLA Clear type of ice formation
CLB Climb
CLBI Climb Immediately
CLBN Crash Locator Beacon
CLBR Calibration
CLC Course Line Computer
CLD Cloud
CLDS Clouds
CLEEN Continuous Lower Energy, Emissions & Noise
CLG Calling
CLIN Contract Line Item
CLK Clock
CLKOB Clockwise Orbit
CLKWS Clockwise
CLN Colon
CLNC Clearance
CLNC DEL Clearance Delivery
CLODA Closing Date
CLOS Command to Line of Sight
CLOTO Close This Office
CLR Clear
CLRAP Cleared as Planned
CLRG Clearing
CLRS Clear and Smooth
CLS Cabin Lighting System
CLSD Closed
CLST Celestial
CLT Calculated Landing Time
CLU Circuit Line Up
CM Centimeter
CM Configuration Management
CMA Comma
C-MAN Coastal-Marine Automated Network
CMAP Center Mapping Automation Program
CMB Climb to or Climbing to
CMCS Central Maintenance Computer System
CMD Command
CME Coronal Mass Ejection
CMFO Certificate Management Field Office
CMG Cockpit to Main Gear
CMIS Certificate Management Information System
CMNC Commence
CMNPS Canadian Minimum Navigation Performance Specification Airspace
CMO Certificate Management Office
CMPCT Compact
CMPL Complete or Completed or Completion
CMPLT Complete
CMPLX Complex
CMPSN Composition
CMPT Component
CMPTR Computer
CMR Central Management Unit
CMS Construction Maintenance Supervisor
CMSN Commission
CMU Certificate Management Unit
CMWS Common Missile Warning System
CNCL Cancel
CNCLD Cancelled
CNCLG Cancelling
CNCLS Cancels
CNCNT Concurrently
CNCT Connect
CNDN Canadian
CNF Computer Navigation Fix
CNFDC Confidence
CNL Cancel
CNLFP Cancel Flight Plan
CNMPS Canadian Minimum Navigation Performance Specification Airspace
CNS Communications, Navigation and Surveillance
CNS Consolidated NOTAM System
CNSP Consolidated NOTAM System Processor
CNSTNT Consistent
CNTR Center
CNTRD Centered
CNTRL Central
CNTRLN Centerline
CNTRS Centers
CNTY County
CNTYS Counties
CNVG Converge
CNVGG Converging
CNVGNC Convergence
CNVRT Convert
CNVSN Conversion
CNVTN Convection
CNVTV Convective
CNVTVLY Convectively
CO Central Office
CO Company
CO Contracting Officer
CO County
COA Certificate of Authority
COB Close of Business
COC Climb on Course
COE Center of Excellence
COE U.S. Army Corps of Engineers
COLL Collect
COM Communication
COMB Combine
COMCO Communications Outlet
COMED Combined Map and Electronic Display
COML Commercial
COMLO Compass Locator
COMM Communication
COMP Compressor
COMPAR Compare
COMPARD Compared
COMPARG Comparing
COMPARS Compares
COMPR Compare
COMPRT Compartment
CONC Concrete
CONCA Continue Calling
COND Condition
CONF Confidential
CONFDC Confidence
CONFIG Configuration
CONFIGN Configuration
CONN Connection
CONOPS Concept of Operations
CONR Continental NORAD Region
CONS Continuous
CONSO CONSOLAN Facility
CONSOL Console beacon
CONSOLAN Low or medium frequency long range navigational aid
CONST Construction
CONT Continue(s) or continued
CONTD Continued
CONTDVD Continental Divide
CONTG Continuing
CONTH Continue to hold
CONTLY Continually
CONTR Contract
CONTRAILS Condensation Trails
CONTS Continues
CONUS Continental United States
COOP Continuity of Operations Plan
COORD Coordinate
COORD Coordinates
COP Changeover Point
COPCOM Controllers’ Operations and Procedures Committee
COPT Completed Procedure Turn
COR Correct or corrected or correction
CORAS Corridor Assignment
COREQ Confirming Requisition Follows
CORP Private Corporation other than ARINC or MITRE
CORR Correction
COS/MOS Complementary Oxide Silicon/Metal Oxide Silicon
COT At the coast
COTR Contracting Officer's Technical Representative
COTS Commercial Off the Shelf
COV Cover
CP Center of Pressure
CP Circular Polarization
CP Conflict Probe
CP Control Panel
CPA Crash Phone Activated
CPB Chemically Powered Bomber
CPBL Capable
CPC Certified Professional Controller
CPCS Consolidated Production Control System
CPD Coupled
CPDLC Controller Pilot Data Link Communications
CPE Customer Premise Equipment
CPF Complete Power Failure
CPIC Capital Planning and Investment Control
CPL Commercial Pilot License
CPL Current Flight Plan
CPME Calibration Performance Monitoring Equipment
CPMIS Consolidated Personnel Management Information System
CPN Air transport pulse radar navigation aid
CPS Air transport pulse radar search
CPTY Capacity
CPU Central Processor Unit
CRA Conflict Resolution Advisory
CRAD Composite Radar Data Processing
CRAF Civil Reserve Air Fleet
CRC Circle
CRC Coordinating Research Council
CRC Cyclic Redundancy Check
CRCHF Crew Chief
CRCLC Circulate
CRCLN Circulation
CRCT Collaborative Routing Coordination Tool
CRDA Converging Runway Display Aid
CRDA Cooperative Research & Development Agreement
CPHC Central Pacific Hurricane Center
CRLC Circulate
CRM Cockpit Resource Management
CRM Crew Resource Management
CRNR Corner
CRNRS Corners
CROM Control and Read Only Memory
CRP Compulsory Reporting Point
CRS Certified Repair System
CRS Computer Reservation System
CRS Course
CRT Cathode Ray Tube
CRTFY Certify
CRYPTO Cryptographic
CRZ Cruise
CRZAM Cruise and Maintain
CRZWTR Cruise Well to Right
CS Call Sign
CS Cirrostratus
CS Course Select
CS/C Combined station/center
CS/T Combined station/tower
CSA Central Service Area
CSA Communications Service Authorization
CSA Comparative Safety Assessment
CSAP Combined Services Access Point
CSAP Common Services Access Point
CSATR Climb so as to reach
CSATX Climb so as to cross
CSC Central Service Center
CSD Constant Speed Drive
CSDR Consider
CSDRBL Considerable
CSER Contractor Site Engineering Report
CSEU Control Systems Electronic Unit
CSH Calculated Service Hours
CSIS Centralized Storm Information System
CSL Current Sinking Logic
CSLDT Consolidate
CSMC Cyber Security Management Center
CSO Customer Service Office
CSR Communications Service Request
CSS Central Site System
CSS-WX Common Support Services – Weather
CST Central Standard Time
CST Coast
CSTA Chief Scientist and Technical Advisor
CSTL Coastal
CSTWRK Cost Work
CT Control Tower
CT Control Transfomer
CTA Control Area
CTA Controlled Time of Arrival
CTA/FIR Control Area/Flight Information Region
CTAF Common Traffic Advisory Frequency
CTAM Climb to and maintain
CTAS Center TRACON Automation System
CTAS Controlled Airspace
CTAX Climb to and cross
CTC Contact
CTCC Change to Center Control
CTCC Changing to Center Control
CTCC Contact Center Control
CTCEN Contact Center
CTD Charge Transfer Device
CTGY Category
CTL Complementary Transistor Logic
CTL Control
CTLA Control Area
CTLB Control Boundary
CTLR Controller
CTLZ Control Zone
CTM Centrifugal Twisting Moment
CTMA Center Traffic Management Advisor
CTN Caution
CTOL Conventional Takeoff and Landing
CTR Control Zone
CTRAC Common Terminal Radar Approach Control
CTSKLS Catskills
CU Cumulus
CUF Cumuliform
CUFRA Cumulus Fractus
CUPS Consolidated Uniform Payroll System
CUSNO Customs has been notified
CUST Customs
CVFP Cancel VFR flight plan
CVFP Charted Visual Flight Procedure
CVFR Controlled Visual Flight Rules
CVINO Clearance Void if Not Off
CVN Convene
CVR Cockpit Voice Recorder
CVR Cover
CVRD Covered
CVRG Covering
CVRS Computerized Voice Reservation System
CVTS Compressed Video Transmission Service
CW Caution and Warning
CW Clockwise
CW Continuous Wave
CWA Center Weather Advisories
CWM Change Weight Manifest
CWO Contract Weather Observer
CWP Central Weather Processor
CWP Corporate Work Plan
CWRC Climb Well to Right of Course
CWS Control Wheel Steering
CWSU Central Weather Service Unit
CWTR Climb Well to Right
CWY Clearway
CXA Cancel Approved Arrival
CXD Cancel Approved Departure
CYC Cyclonic
CYCLGN Cyclogenesis
CYL Cylinder
CZ Control Zone (Canada)
CZM Coastal Zone Management
D
D Danger Area
D/A Digital-to-Analog
D/G Driver/Gate
DA Decision Altitude/Decision Height
DA Departure Approved
DA Descent Advisor
DA Direct Access
DA Drift Angle
DA Density Altitude
DA/H Decision Altitude/Height
DAAR Deviation Approved as Requested
DABBS DITCO Automated Bulletin Board System
DABRK Daybreak
DAC Digital-to-Analog Converter
DACS Digital Aeronautical Chart Supplement
DAD Data Acquisition Display
DADC Digital Air Data Computer
DADS Digital Aeronautical Database System
DAE District Airport Engineer
DAFIS Departmental Accounting and Financial Information System
DAIR Direct Altitude and Identity Readout
DAIRE Direct Altitude and Identification Readout Equipment
DAIS Digital Avionics Information System
DALGT Daylight
DALR Digital Audio Legal Recorder
DALR Dry Adiabatic Lapse Rate
DAP Do All Possible
DAPD Descend at pilot’s discretion
DAR Data-Access Register
DAR Designated Agency Representative
DAR Designated Airworthiness Representative
DARC Direct Access Radar Channel
DARP Dynamic Aircraft Route Planning
DARPA Defense Advanced Research Projects Agency
DASI Digital Altimeter Setting Indicator
DASR Digital Airport Surveillance Radar
DATIS Data Link Automatic Terminal Information Service
D-ATIS Digital Automatic Terminal Information Service
DB Database
DB Decibel
DB Describe
DB Diffusion Bonding
DBA Database Administrator
dBA Decibels A-Weighted
DBA Doing Business As
DBASI Digital Barometer Altimeter Setting Indicator
DBCRC Defense Base Closure and Realignment Commission
DBE Disadvantaged Business Enterprise
DBL Double
DBMS Data Base Management System
DBRITE Digital Bright Radar Indicator Tower Equipment
DBS Doppler Beam Sharpening
DBTF Doubtful
dBZ decibels of Z
DC Direct Current
DCA Defense Communications Agency
DCAA Dual Call, Automatic Answer Device
DCAVU Clear or scattered clouds and visibility greater than ten, remainder of report missing (weather reports only)
DCC Direct Channel Complex
DCC Discrete Component Circuit
DCCU Data Communications Control Unit
DCD Double Channel Duplex
DCDR Decoder
DCE Data Communications Equipment
DCF Deputy Chief
DCFL Direct-Coupled Field Effect Transistor Logic
DCKG Docking
DCL Direct-Coupled Logic
DCLRT Decelerate
DCM Defense Combat Maneuvers
DCMSN Decommission
DCMT Document
DCPC Direct controller pilot communications
DCR Decrease
DCRD Decreased
DCRG Decreasing
DCRGLY Decreasingly
DCRS Decreases
DCRZ Descend to and Cruise
DCS Defense Communications System
DCS Double Channel Simplex
DCT Direct
DCTL Direct-Coupled Transistor Logic
DDA Dedicated Digital Access
DDB Digital Data Bus
DDD Direct Distance Dialing
DDI Dual Distance Indicator
DDM Difference in Depth of Modulation
DDS Digital Data Service
DDS Digital Display System
DE From (used to precede the call sign of the calling station)
DEA Drug Enforcement Agency
DECCO Defense Commercial Communications Office
DEDS Data Entry and Display System
DEF Defense
DEFCON Defense Readiness Conditions
DEG Degree
DEGS Degrees
DEIS Draft Environmental Impact Statement
DELPHO Deliver by Telephone
DEM Digital Elevation Model
DEMOD Demodulator
DEMOL Demolition
DENEB Fog Dispersal Operations
DEP Depart
DEP Departure
DEPT Department
DER Departure End of Runway
DER Designated Engineering Representative
DES Descend to or descending to
DESTN Destination
DETRESFA Distress Phase Code (Alerting
DEV Deviation
DEW Distant Early Warning
DEWIZ Distance Early Warning Identification Zone
DF Direction Finder
DFAX Digital Facsimile
DFCLT Difficult
DFCLTY Difficulty
DFDAU Digital Flight Data Acquisition Unit
DFDR Digital Flight Data Recorder
DFI Direction Finding Indicator
DFL Daily Flight Log
DFM Departure Flow Management
DFNT Definite
DFNTLY Definitely
DFRS Differs
DFTI Distance From Touchdown Indicator
DFUS Diffuse
DG Directional Gyro
DGCGO Dangerous Cargo
DGNL Diagonal
DGNSS Differential Global Navigation Satellite System
DGPS Differential Global Positioning Satellite (System)
DGPS Differential Global Positioning System
DGR Danger
DH Decision Height
DHS Department of Homeland Security
DI Delay Indefinite
DI Departure Approval Request for IFR flight
DI Digital Interface
DIA Denver International Airport
DIAM Diameter
DIC Digital Integrated Circuit
DID Direct Inward Dial
DIF Diffuse
DIFCS Digital Integrated Flight Control System
DIGG Digging
DIL Dual In-Line
DIP Drop and Insert Point
DIP Dual In-Line Package
DIR Director
DIRF Direction Finding
DISABLD Disabled
DISC Discontinue
DISCD Discontinued
DISCG Discontinuing
DISEM Disseminate
DISRE Disregard
DISRED Disregarded
DISREG Disregarding
DIST Distance
DIST District
DISTR Distribute
DISTR Distributor
DISU Drug Investigation Support Unit
DITCO Defense Information Technology Contracting Office Agency
DIV Divert
DIV Division
DKTS Dakotas
DLA Delay
DLAC Delay Account of
DLAD Delayed
DLAP Data Link Applications Processor
DLAT Delay Time
DLC Delay Clearance or Delayed Clearance
DLC Direct Lift Control
DLIC Data Link Initiation Capability
DLRS Digital Legal Recording System
DLSP Data Link Service Provider
DLT Delete
DLTD Deleted
DLTG Deleting
DLVR Deliver
DLVY Delivery
DLY Daily
DMA Direct Memory Access
DMAAC Defense Mapping Acy Aerospace Center
DMAHC Defense Mapping Acy Hydrographic Center
DMAP Digital Modular Avionics Program
DMC Direct Memory Channel
DME Designated Mechanic Examiner
DME Distance Measuring Equipment
DME/P Precision Distance Measuring Equipment
DMEG DME Co-located with Glide Slope
DMEL DME Co-located with Localizer
DMER DME Tactical air navigation with DME only commissioned
DMEV DME Co-located with VOR
DMG Damage
DMGD Damaged
DMGG Damaging
DMLS Doppler Microwave Landing System
DMM Digital Multimeter
DMN Data Multiplexing Network
DMNT Dominant
DMO Directives Management Officer
DMOS Double-diffused Metal Oxide Silicon Semiconductor
DMRS Database Management Reporting System
DMS Data Management System
DMS Drawing Management System
DMSH Diminish
DMSHD Diminished
DMSHG Diminishing
DMSHS Diminishes
DMSTN Demonstration
DNA Defense Nuclear Agency
DND Department of National Defense (Canada)
DNDFTS Downdrafts
DNG Danger
DNL Day-Night Equivalent Sound Level
DNS Dense
DNSLP Downslope
DNSTRM Downstream
DNWND Downwind
DO Deputy Commander for Operations
DO Ditto
DOB Date of Birth
DOC Department of Commerce
DOD Department of Defense
DOD Direct Outward Dial
DOD Domestic Object Damage
DOE Department of Energy
DOF Digital Obstacle File
DOI Department of Interior
DOLLY Data Link
DOM Domestic
DOS Department of State
DOT Department of Transportation
DOT1 Transport One Secretary of Transportation
DOT2 Transport Two Deputy Secretary of Transportation
DOTCC Department of Transportation Computer Center
DOTS Dynamic Ocean Track System
DOTS Dynamic Ocean Tracking System
DOVE DSR Oceanic VSCS En Route Implementation Working Group
DP Deep
DP Departure Procedures
DP Dew Point
DP Differential Protection
DPCR Departure Procedure
DPE Designated Pilot Examiner
DPND Deepened
DPNG Deepening
DPNS Deepens
DPR Deeper
DPRE Designated Parachute Rigger Examiner
DPT Depth
DPTH Depth
DR Dead Reckoning
DR Direct Route
DR Disaster Recovery
DR Low Drifting
DRC Dual Remote Compensator
DRCT Direct
DRCTN Direction
DRDU Low Drifting Dust
DRFT Drift
DRFTD Drifted
DRFTG Drifting
DRFTS Drifts
DRG During
DRIR Direct Readout Infrared
DRMS Distance Root Mean Square
DRP Disaster Recovery Plan
DRR Deployment Readiness Review
DRS Designee Registration System
DRSA Low Drifting Sand
DRSN Low Drifting Snow
DRVSM Domestic Reduced vertical Separation Minimums
DRZL Drizzle
DS Directionally Solidified
DS Domestic Services (Island operations)
DS Dust Storm
DSATR Descend so as to reach
DSATX Descend so as to cross
DSB Double Sideband
DSB Double-sided Board
DSC Digital-to-Synchro Converter
DSCNT Descent
DSCS Digital Satellite Compression Service
DSG Data Services Group
DSGND Designated
DSIPT Dissipate
DSIPTD Dissipated
DSIPTG Dissipating
DSIPTN Dissipation
DSIPTS Dissipates
DSM Dynamic Scattering Mode
DSN Defense Switching Network
DSND Descend
DSNDG Descending
DSNDI Descend Immediately
DSNDS Descends
DSNT Distant
DSP Departure Sequencing Program
DSPL Display
DSPLC Displace
DSPN Disposition
DSPRL Dispersal
DSR Desire
DSR Display System Replacement
DSRGD Disregard
DSS Decision Support System
DST Distort
DSTBLZ Destabilize
DSTBLZD Destabilized
DSTBLZG Destabilizing
DSTBLZN Destabilization
DSTBLZS Destabilizes
DSTC Distance
DSTND Destined
DSUA Dynamic Special Use Airspace
DT Delay Time
DT Daylight Savings Time
DTAM Descend to and maintain
DTAX Descend to and cross
DTE Data Terminal Equipment
DTED Digital Terrain Elevation Data
DTF Data Transmission Feature
DTG Date Time Group
DTG Distance to Go
DTHR Displaced Runway Threshold
DTL Detail
DTL Diode-Transistor Logic
DTLN International Dateline
DTM Digital Terrain Model
DTR Data Transmission Request
DTRM Determine
DTRT Deteriorate
DTRTD Deteriorated
DTRTG Deteriorating
DTRTS Deteriorates
DTS Dedicated Transmission Service
DTS Diplomatic Telecommunications Service
DTW Dual Tandem Wheels
DU Display Unit
DU Widespread Dust
DUAT Direct User Access Terminal
DUATS Direct User Access Terminal System
DUC Dense Upper Cloud
DUF Diffusion Under Epitaxial Film
DUPE Duplicate
DUR Duration
DURC During Climb
DURD During Descent
DURG During
DURN Duration
DV Distinguished Visitors
DVA Diverse Vector Area
DVD Digital Versatile Disk
DVFR Day Visual Flight Rules
DVFR Defense Visual Flight Rules
DVLP Develop
DVLPD Developed
DVLPG Developing
DVLPMT Development
DVLPS Develops
DVM Digital Voltmeter
DVOF Digital Vertical Obstruction File
DVOR Doppler Very High Frequency Omni Directional Range
DVRG Diverge
DVRGG Diverging
DVRGNC Divergence
DVRGS Diverges
DVRS Digital Voice Recorder System
DVRSN Diversion
DVV Downward Vertical Velocity
DW Dual Wheels
DWG Drawing
DWN Down
DWNDFTS Downdrafts
DWPNT Dew Point
DWPNTS Dew points
DWRC Descend well to right of course
DWTR Descend well to right
DX Duplex
DYSIM Dynamic Simulator
DZ Drizzle
E
E East or Eastern longitude
E Eastern Standard Time (time groups only)
E Ending of Precipitation (time in minutes) (weather reports only)
E Equatorial (air mass)
E/G Engine Generator
E/R Exchange and Repair
EA Enterprise Architecture
EA Environmental Assessment
EAA Experimental Aircraft Association
EAC Expect Approach Clearance
EACLN Expect Approach Clearance
EACNL Expect Approach Clearance No Later Than
EADF Electronic Automatic Direction Finder
EADI Electronic Attitude Director Indicator
EADIZ Entering Air Defense Identification Zone
EAE Experimental Aircraft Examiner
EAROM Electrically Alterable Read Only Memory
EARS En Route Analysis and Reporting System
EARTS En Route Automated Radar Tracking System
EAS Equivalent Airspeed
EASA European Aviation Safety Agency
EAT Expected Approach time
EB Eastbound
EBC Event Based Currency
EBCDIC Extended Binary Coded Decimal Interchange Code
EBND Eastbound
EBUS Enhanced Backup Surveillance
EBW Electron Beam Welding
EC EICAS Computer
EC Engineering Center
ECA Enter Control Area
ECAM Electronic Centralized Aircraft Monitor
ECAS Enter Controlled Airspace
ECCM Electronic Counter Countermeasure
ECD Expect Change Departure
ECFP Extended Convective Forecast Product
ECG En Route Communications Gateway
ECL Emitter-Coupled Logic
ECM Electro-Chemical Machining
ECM Electronic Counter Measures
ECMSN Electronic Counter Measure Mission
ECOM En Route Communications
ECPIC Electronic Capital Planning Investment Control
ECR Expect Change Route
ECS Environmental Control System
ECSP Electronic Specialist
ECTL Emitter-Coupled Transistor Logic
ECVFP Expanded Charted Visual Flight Procedures
EDA Early Departure Authorized
EDC Early Display Configuration
EDC En Route Departure Capability
EDC Enterprise Data Center
EDC Expect Departure Clearance At
EDCT Estimated Departure Clearance Time
EDCT Estimated Departure Control Time
EDCT Expedite Departure Path
EDDA Environmental Due Diligence Audit
EDI Electronic Data Interchange
EDM Electro-Discharge Machining
EDMS Electronic Document Management Systems
EDMS Emissions and Dispersion Modeling System
EDPS Electronic Data Processing System
EDR Expect Departure Release At
EDS Enterprise Database System
EDSP EICAS Display Select Panel
EDT Eastern Daylight Time
EDU EICAS Display Unit
EEC Electronic Engine Control
EEE Error (to be used in AFS as a procedure signal)
EELV Evolved Expendable Launch Vehicle
EEM Electronic Equipment Modification
EENGR Electrical Engineer
EEO Equal Employment Opportunity
EEP End Exercise Point
EE-PROM Electrically Erasable Programmable Read Only Memory
EET Estimated Elapsed time
EF Enhanced Fujita - Tornado Damage Intensity
EFA Entire Field Available
EFAS En Route Flight Advisory Service
EFB Electronic Flight Bag
EFC Expect Further Clearance
EFCT Effect
EFCU Electronic Flight Control Unit
EFF Effective
EFI Electronic Flight Instruments
EFIS Electronic Flight Information Systems
EFIS Electronic Flight Instruments System
EFISCP Electronic Flight Instrument System Control Panel
EFISCU Electronic Flight Instrument System Comparator Unit
EFISSG Electronic Flight Instrument System Signal Generator
EFL Emitter-Follower Logic
EFM Enhanced Fighter Maneuverability
EFOGM Enhanced Fiber Optic Guided Missile
EFR Expect Further Routing
EFSTS Electronic Flight Strip Transfer System
EFTO Encrypt for Transmission Only
EG Emergency Gear
EGECON Electronic Geographic Coordinator Navigation System
EGNOS European Geostationary Navigation Overlay System
EGPWS Enhanced Ground Proximity Warning System
EGT Exhaust Gas Temperature
EHA Expect Higher Altitude
EHF Extremely High Frequency (30000 to 300000 MHz)
EHP Equivalent Hoursepower
EHSI Electronic Horizontal Situation Indicator
EHSID Electronic Horizontal Situation Indicator Display
EHSV Electro-Hydraulic Servo Valve
EIA Electronic Industries Association
EIAF Expanded Inward Access Features
EICAS Engine Indicating and Crew Alerting System
EIS Environmental Impact Statement
EIT Electronic Installation Technician
EIU EFIS/EICAS Interface Units
ELAT Estimated Latitude
ELBA Emergency Location Beacon Aircraft
ELCU Electrical Load Control Unit
ELD Electrical Load Database
ELEC Electric
ELECN Electrician
ELEV Elevate or Elevation
ELIP Elliptical
ELMS Electronic Learning Management System
ELMT Electronic Mechanic Technician
ELNGT Elongate
ELNGTD Elongated
ELONG Estimated Longitude
ELR Extra Long Range
ELSW Elsewhere
ELT Emergency Locator Transmitter
ELWRT Electrowriter
EM Emission
EMALS Electromagnetic Aircraft Launch Systems
EMAS Engineered Materials Arresting System
EMBD Embedded (In cloud layer)
EMBDD Embedded
EMDO Engineering and Manufacturing District Office
EMERG Emergency
EMFI Electromechanical Flight Instruments
EMI Electromagnetic Interference
EMI Electronic Maintenance Inspector
EMP Electromagnetic Pulse
EMPS En Route Maintenance Processor System
EMS Emergency Medical Service
EMS Environmental Management System
EMSAW Ee Route Minimum Safe Altitude Warning
E-MSAW En Route Automated Minimum Safe Altitude Warning
EMSU Environment Meteorological Support Unit
EMT Electronic Maintenance Technician
ENAV En Route Navigational Aids
ENCTR Encounter
END Stop End (Related to RVR)
ENDCE Endurance
ENDG Ending
ENE East North East
ENELY East-northeasterly
ENERN East North Eastern (weather reports only)
ENEWD East North Eastward (weather reports only)
ENG Engine
ENGR Engineer
ENHNC Enhance
ENHNCD Enhanced
ENHNCG Enhancing
ENHNCMNT Enhancement
ENHNCS Enhances
ENR Enroute
ENRC Enroute Chart (followed by name/ title)
ENRT En Route
ENTR Entire
EO Electro-Optical
EOBT Estimated Off Block Time
EOC Emergency Operations Center
EOD Entered on Duty
EOF Emergency Operating Facility
EOF Expected Operations Forecast
EOPF Electronic Official Personnel File
EOSH Environmental and Occupational Safety & Health
EOSH Environmental Compliance Occupational Safety and Health
EOW Empty Operating Weight
EP En Route Penetration
EP External Power
EPA Environmental Protection Agency
EPE Estimated Position Error
EPI Element Performance Inspection
EPI Expanded Position Indicator
EPIREP Electronic Pilot Report
EPNDB Equivalent Perceived Noise Decibels
EPR Engine Pressure Ratio
EPROM Erasable Programmable Read Only Memory
EPS Engineered Performance Standards
EPSS Enhanced Packet Switched Service
EPU Emergency Power Unit
EQCRT Equipment Certified
EQPT Equipment
EQUIP Equipment
ERAD En Route Broadband Radar
ERAD En Route Radar (Broadband)
ERAM En Route Automation Modernization
ERAU Embry Riddle Aviation University
ERIDS En Route Information Display System
ERIT Enhanced Radar Intelligent Tool
ERM En Route Spacing Program
ERMG En Route Metering
ERMS Environmental Remote Monitoring System
ERN Eastern
ER-OPS Extended Range Operations
ERSP En Route Spacing Program
ERU Explosion Release Unit
ERY Early
ERYR Earlier
ES Extended Squitter
ES&H Environmental Safety and Health
ESA Eastern Service Area
ESA European Space Agency
ESC Eastern Service Center
ESC Enterprise Service Center
ESCAT Emergency Security Control of Air Traffic
ESD Electrostatic Discharge
ESE East South East
ESEC En Route Broadband Secondary Radar
ESEC En Route Secondary Radar Beacon
ESELY East-southeasterly
ESERN East South Eastern (weather reports only)
ESEWD East South Eastward (weather reports only)
ESF Extended Superframe Format
ESHP Equivalent Shaft Horsepower
ESIS Enhanced Status Information System
ESIS Environmental Safety Information System
ESNTL Essential
ESP En Route Sequencing Program
ESP En Route Spacing Program
ESRI Environmental Systems Research Institute
EST Eastern Standard Time
EST Estimate or Estimation
ESTAB Establish
ESTS Estimates
ESV Expanded Service Volume
ESYS En Route Equipment Systems
ET Electronic Technician
ETA Estimated Time of Arrival
ETARS En Route Tracking Automatic Radar Service
ETC Et Cetera
ETD Estimated Time of Departure
ETE Estimated Time En Route
ETFL Each Thousand Foot Level
ETG Enhanced Target Generator
ETI Estimated Information
ETIM Elapsed Time
ETMS Enhanced Traffic Management Systems
ETN Electronic Telecommunications Network
ETO Engineering Technical Officer
ETO Estimated Time Over Significant Point
ETOPS Extended Twin-Engine Operations
ETOV Estimated Time Over
ETP Estimated Time of Penetration
ETR Eastern Test Range
ETVCT En Route Training Voice Communication Tool
ETVS Enhanced Terminal Voice Switch
EU Electronic Unit
EUO Emergency Use Only
EUROCAE European Organization for Civil Aviation Equipment
EUV Extreme Ultraviolet
EV Every
EVA Extravehicular Activity
EVAC Evacuation
EVAL Evaluate or Evaluation
EVAS Enhanced Vortex Advisory System
EVCS Emergency Voice Communications System
EVE Evening
EVFR Electronic Visual Flight Rules
EVM Earned Value Management
EVS Electronic Voice Switching System
EVS Electro-Optical viewing System
EVT Expect Vector To
EW Electronic Warfare
EWD Eastward
EWINS Enhanced Weather Information System
EXAM Examination
EXC Except
EXCH Exchange
EXCLD Exclude
EXCLV Exclusive
EXCLVLY Exclusively
EXCP Except
EXCT Execute
EXDLVY Expedite Delivery
EXEC Executive
EXEC1 President on board civil aircraft
EXEC1F President’s family is aboard aircraft
EXEC2 Vice President is aboard civil aircraft
EXEC2F Vice President’s family is aboard aircraft
EXER Exercise
EXLOC Extended Localizer
EXP Expect
EXPC Expect
EXPCD Expected
EXPCG Expecting
EXPED Expedite
EXPHO Expedite Delivery by Telephone
EXPS Express
EXQF Expanded Quota Flow
EXREP Expedite Mail Reply
EXSEC Extra Section
EXSHI Expedite Shipment
EXTD Extend
EXTDD Extended
EXTDG Extending
EXTDS Extends
EXTN Extension
EXTRAP Extrapolate
EXTRAPD Extrapolated
EXTRM Extreme
EXTRMLY Extremely
EXTSV Extensive
