signal.
DSDU Data Signal Display Unit
DSF Display System Function
DSNS Differential Satellite Navigation System
DSP (1)Display Select Panel
(2)Departure Sequencing Prototype
DSR Display System Replacement
DTD (1) Data Terminal Display
(2) Document Type Definition
DTE Data Terminal Equipment
DT & E Development Test and Evaluation
DTMF Dual Tone Multi-Frequency
DTU Data Transfer Unit
DU Display Unit
Dual Mode An airborne DME rt capable of processing DME/N
DME and DME/P ground station signals.Operation is in the
L-band frequency range.
DUATS Direct User Access Terminal System
Duplex A communication operation that uses the simultane-
ous operation of the transmit and receive equipment
at two locations.
DVM Digital Voltmeter
DX Distance
Dynamic Dynamic Pressure is the dif ference between pitot and
Pressure static pressure.
Dynamic RAM constructed of capacitor elements. Memory
RAM cells must be periodically refreshed to keep capaci
tors from discharging and losing data (see “Static
RAM”).
E
EADI Electronic Attitude Director Indicator
EAI Engine Anti-Ice
EANPG European Air Navigation Planning Group
EAP Engine Alert Processor
EAROM Electrically Alterable ROM
EARTS En route Automated Radar Tracking System
EASIE Enhanced ATM and Mode S Implementation in Europe
EATCHIP European ATC Harmonization and Integration
Program
EATMS European Air Traffic Management System
EC Event Criterion
ECAC European Civil Aviation Conference
ECAM Electronic Caution Alert Module
ECEF Earth-Centered,Earth-Fixed
Echo The portion of the radiated energy reflected back to
the antenna from the target (WXR).
ECL Emitter Coupler Logic
ECMP Electronic Component Management System
ECP EICAS Control Panel
ECS (1) Engineering Compiler System. An automated data
storage system.
(2) Environmental Control System
(3) Event Criterion Subfield
ECSL Left Environmental Control System Card
ECSMC ECS Miscellaneous Card
ECSR Right Environmental Control System Card
ED EICAS Display
EDA Electronic Design Automation
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