CTC —contact  CTL —control  CTMA —Center Traffic Management Advisor  CVFR —controlled visual flight rules  CUPS —consolidated uniform payroll system  CVTS —compressed video transmission service  CW —continuous wave  CWSU —Central Weather Service Unit  CWY —clearway  DA —direct access; decision altitude/decision height;  Descent Advisor  DABBS —DITCO automated bulletin board system  DAIR —direct altitude and identity readout  DALGT —daylight  DAR —Designated Agency Representative  DARC —direct access radar channel  dBA —decibels A-weighted  DBCRC —Defense Base Closure and Realignment  Commission  DBE —disadvantaged business enterprise  DBMS —database management system  DBRITE —digital bright radar indicator tower equipment  DCA —Defense Communications Agency  DCAA —dual call, automatic answer device  DCCU —Data Communications Control Unit  DCE —data communications equipment  DCMSND —decommissioned  DCT —direct  DDA —dedicated digital access  DDD —direct distance dialing  DDM —difference in depth of modulation  DDS —Digital Data Service  DEA —Drug Enforcement Agency  DEDS —data entry and display system  DEGS —degrees  DEIS —Draft Environmental Impact Statement  DEP —depart/departure  DEPPROC —departure procedures  DEWIZ —distance early warning identification zone  DF —direction finder  DFAX —digital facsimile  DFI —direction finding indicator  DGPS —Differential Global Positioning Satellite (System)  DH —decision height  DID —direct inward dial  DIP —drop and insert point  DIRF —direction finding  DISABLD —disabled  DIST —distance  DITCO —Defense Information Technology Contracting  Office Agency  EPS —Engineered Performance Standards  EPA —Environmental Protection Agency  EOF —emergency Operating Facility  ENTR —entire  ENRT —en route  ENG —engine  ENAV —en route navigational aids  E-MSAW —en route automated minimum safe altitude  warning  EMS —environmental management system  EMPS —en route maintenance processor system  EMAS —engineered materials arresting system  ELWRT —electrowriter  ELT —emergency locator transmitter  ELEV —elevation  EIS —environmental impact statement  EIAF —expanded inward access features  EFIS —electronic flight information systems  EFC —expect further clearance  EDCT —expedite departure path  ECVFP —expanded charted visual flight procedures  ECOM —en route communications  EB —eastbound  EARTS —en route automated radar tracking system  EA —environmental assessment  E —east  DYSIM —dynamic simulator  DVOR —doppler very high frequency omni-directional range  DVFR —defense visual flight rules; day visual flight rules  DUAT —direct user access terminal  DTS —dedicated transmission service  DSUA —dynamic special use airspace  DSPLCD —displaced  DSCS —digital satellite compression service  DRFT —snowbank(s) caused by wind action  DP —dew point temperature  DOTS —dynamic ocean tracking system  DOTCC —Department of Transportation Computer Center  DOT —Department of Transportation  DOS —Department of State  DOI —Department of Interior  DoD —Department of Defense  DOD —direct outward dial  DNL —day-night equivalent sound level (also called Ldn)  DMSTN —demonstration  DMN —Data Multiplexing Network  DME/P —precision distance measuring equipment  DME —distance measuring equipment  DLY —daily  DLT —delete  DLA —delay or delayed  D  E  B-4 