10/5/23 

Pilot/Controller Glossary 

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EAS

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(See EN ROUTE AUTOMATION SYSTEM.) 

EDCT

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(See EXPECT DEPARTURE CLEARANCE TIME.) 

EDST

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(See EN ROUTE DECISION SUPPORT TOOL) 

EFC

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(See EXPECT FURTHER CLEARANCE (TIME).) 

ELT

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(See EMERGENCY LOCATOR TRANSMITTER.) 

EMBEDDED ROUTE TEXT

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 An EDST notification that an ADR/ADAR/AAR has been applied to the flight 

plan. Within the route field, sub

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fields consisting of an adapted route or an embedded change in the route are 

color

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coded in cyan with cyan brackets around the sub

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field. 

(See EN ROUTE DECISION SUPPORT TOOL.) 

EMERGENCY

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A distress or an urgency condition. 

EMERGENCY AUTOLAND SYSTEM

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 This system, if activated, will determine an optimal airport, plot a 

course, broadcast the aircraft’s intentions, fly to the airport, land, and (depending on the model) shut down the 

engines. Though the system will broadcast the aircraft’s intentions, the controller should assume that 

transmissions to the aircraft will not be acknowledged. 
EMERGENCY DESCENT MODE

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 This automated system senses conditions conducive to hypoxia (cabin 

depressurization). If an aircraft is equipped and the system is activated, it is designed to turn the aircraft up to 

90 degrees, then descend to a lower altitude and level off, giving the pilot(s) time to recover. 
EMERGENCY LOCATOR TRANSMITTER (ELT)

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 A radio transmitter attached to the aircraft structure which 

operates from its own power source on 121.5 MHz and 243.0 MHz. It aids in locating downed aircraft by 

radiating a downward sweeping audio tone, 2-4 times per second. It is designed to function without human action 

after an accident. 

(Refer to 14 CFR Part 91.) 
(Refer to AIM.) 

E-MSAW

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(See EN ROUTE MINIMUM SAFE ALTITUDE WARNING.) 

ENHANCED FLIGHT VISION SYSTEM (EFVS)

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 An EFVS is an installed aircraft system which uses an 

electronic means to provide a display of the forward external scene topography (the natural or man

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made features 

of a place or region especially in a way to show their relative positions and elevation) through the use of imaging 

sensors, including but not limited to forward

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looking infrared, millimeter wave radiometry, millimeter wave 

radar, or low

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light level image intensification. An EFVS includes the display element, sensors, computers and 

power supplies, indications, and controls. An operator’s authorization to conduct an EFVS operation may have 

provisions which allow pilots to conduct IAPs when the reported weather is below minimums prescribed on the 

IAP to be flown. 
ENHANCED SPECIAL REPORTING SERVICE (eSRS)– An automated service used to enhance search and 

rescue operations that provides flight service specialists in Alaska direct information from the aircraft’s 

registered tracking device. 
EN ROUTE AIR TRAFFIC CONTROL SERVICES

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 Air traffic control service provided aircraft on IFR flight 

plans, generally by centers, when these aircraft are operating between departure and destination terminal areas. 

PCG E

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