EGT  Exhaust Gas Temperature 
EHSI  Electronic Horizontal Situation Indicator 
EHV  Electro-Hydraulic Valve 
EIA  Electronic Industries Association 
EICAS  Engine Indication and Crew Alert System 
EIS  Engine Indication System 
EISA  Extended Industry Standard Architecture 
EIU  EFIS/EICAS Interface Unit 
ELAN  Ethernet Local Area Network 
ELC  Emitter Coupled Logic 
ELEC  Electrical 
ELM  Extended Length Message 
ELMS  Electrical Load Management System 
ELS  Electronic Library System 
ELT  Emergency Locator Transmitter 
EMC  (1)Entertainment Multiplexer Controller 
(2)Electro Magnetic Capability 
EMER  Emergency 
EMI  Electro-Magnetic Interference 
EMS  Engine Management System 
ENG  Engine 
ENQ  Enquire 
EOT  End-Of-Text 
EP  (1) External Power 
(2) Engineering Project 
EPC  External Power Contractor 
EPCS  Engine Propulsion Control System 
E-Plane  The E-Plane is the plane of an antenna that contains 
the electric field. The principal E-Plane also contains 
the direction of maximum radiation. 
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EPLD  Electrically Programmable Logic Device 
EPR  Engine Pressure Ratio 
EPROM  Erasable Programmable ROM 
EQUIP  Equipment 
Equivalent  Equivalent Airspeed is a direct measure of 
Airspeed  the incompressible freestream of dynamic 
(EAS)  pressure. It is CAS corrected for compressibility 
effects.