- EAA Experimental Aircraft Association (divided into local branches called Chapters).
- EAS Equivalent airspeed, RAS minus correction for compressibility.
- ECCM Electronic counter-countermeasures.
- ECM Electronic countermeasures.
- ECS Environmental control system.
- EEZ Economic exclusion (or exclusive-economic) zone.
- EFIS Electronic flight instrument(ation) system, in which large multifunction CRT displays replace traditional instruments.
- EGPWS Enhanced ground proximity warning system.
- EGT Exhaust gas temperature.
- ehp Equivalent horsepower, measure of propulsive power of turboprop made up of shp plus addition due to residual thrust from jet.
- EICAS Engine indication (and) crew alerting system.
- ekW Equivalent kilowatts, SI measure of propulsive power of turboprop (see ehp).
- elevon Wing trailing-edge control surface combining functions of aileron and elevator.
- elint electronic intelligence.
- ELT Emergency locator transmitter, to help rescuers home on to a disabled or crashed aircraft.
- EMD Engineering and manufacturing development.
- EO Electro-optical.
- EPNdB Effective perceived noise decibel, SI unit of EPNL.
- ERU Ejector release unit.
- ESM (1) Electronic surveillance (or support) measures; (2) Electronic signal monitoring.
- ETOPS Extended-range twin (engine) operations (thus sometimes given as EROPS), routeing not more than a given flight time (120, 180 or 240 minutes) from a usable alternative airfield.
- EW Electronic warfare.
