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Aviation Dictionary

Reference:

1 Airplane Flying Handbook
2 Pilot's Handbook of Aeronautical Knowledge
3 Instrument Procedures Handbook
4 Risk Management Handbook
5 Aviation Instructor Handbook
6 Seaplane Handbook
7 Balloon Handbook
8 Aeronautical Information Manual
9 Airplane Flying Handbook
10 Pilot Controller Glossary
11 Glider Handbook

E

Eddy currents

2 Current induced in a metal cup or disc when it is crossed by lines of flux from a moving magnet.

5 Current induced in a metal cup or disc when it is crossed by lines of flux from a moving magnet.

Eddy current damping

2 The decreased amplitude of oscillations by the interaction of magnetic fields. In the case of a vertical card magnetic compass, flux from the oscillating permanent magnet produces eddy currents in a damping disk or cup. The magnetic flux produced by

EFAS

5 See En Route Flight Advisory Service.

EFC

2 See expect-further-clearance.

5 See expect-further-clearance.

EFD

2 See electronic flight display.

5 For the purpose of standardization, any flight instrument display that uses LCD or other image-producing system (Cathode Ray Tube [CRT], etc.)

Effect

7 A principle of learning that learning is strengthened when accompanied by a pleasant or satisfying feeling, and that learning is weakened when associated with an unpleasant feeling.

EFVS Operation

4 An operation in which visibility conditions require an EFVS to be used in lieu of natural vision to perform an approach or landing, determine enhanced flight visibility, identify required visual references, or conduct a rollout.

EGT

2 See exhaust gas temperature.

Electrical bus

1 See bus bar.

Electrohydraulic

1 Hydraulic control which is electrically actuated.

Electronic Flight Bag (EFB)

4 An electronic display system intended primarily for flight deck or cabin use. EFB devices can display a variety of aviation data or perform basic calculations (e.g., performance data, fuel calculations, etc.). In the past, some of these functions were traditionally accomplished using paper references or were based on data provided to the flight crew by an airline’s flight dispatch function. The scope of the EFB system functionality may also include various other hosted databases and applications

Electronic flight display (EFD)

2 For the purpose of standardization, any flight instrument display that uses LCD or other image-producing system (cathode ray tube (CRT), etc.)

Electronic learning (e-learning)

7 Any type of education that involves an electronic component such as the Internet, a network, a stand-alone computer, CD/DVDs, video conferencing, websites, or e-mail in its delivery.

Element of threat

7 A perception factor that describes how a person is unlikely to easily comprehend an event if that person is feeling threatened since most of a person’s effort is focused on whatever is threatening them.

Elevator

1 The horizontal, movable primary control surface in the tail section, or empennage, of an airplane. The elevator is hinged to the trailing edge of the fixed horizontal stabilizer.

2 The horizontal, movable primary control surface in the tail section, or empennage, of an airplane. The elevator is hinged to the trailing edge of the fixed horizontal stabilizer.

12 Attached to the back of the horizontal stabilizer, if controls movement around the lateral axis.

Elevator illusion

2 The sensation of being in a climb or descent, caused by the kind of abrupt vertical accelerations that result from up- or downdrafts.

5 The sensation of being in a climb or descent, caused by the kind of abrupt vertical accelerations that result from up- or downdrafts.

Ellipsoid of Revolution

4 The surface that results when an ellipse is rotated about one of its axes.

Emergency

2 A distress or urgent condition.

5 A distress or urgent condition.

Emergency locator transmitter

1 A small, self-contained radio transmitter that will automatically, upon the impact of a crash, transmit an emergency signal on 121.5, 243.0, or 406.0 MHz.

Empennage

1 The section of the airplane that consists of the vertical stabilizer, the horizontal stabilizer, and the associated control surfaces.

2 The section of the airplane that consists of the vertical stabilizer, the horizontal stabilizer, and the associated control surfaces.

12 The tail group of the aircraft usually supporting the vertical stabilizer and rudder, as well as the horizontal stabilizer and elevator, or on some aircraft, the V-Tail.

Emphasis error

2 The result of giving too much attention to a particular instrument during the cross-check, instead of relying on a combination of instruments necessary for attitude and performance information.

5 The result of giving too much attention to a particular instrument during the cross-check, instead of relying on a combination of instruments necessary for attitude and performance information.

Empty-field myopia

2 Induced nearsightedness that is associated with flying at night, in instrument meteorological conditions and/or reduced visibility. With nothing to focus on, the eyes automatically focus on a point just slightly ahead of the airplane.

EM wave

2 Electromagnetic wave.

5 Electromagnetic wave.

Encoding altimeter

2 A special type of pressure altimeter used to send a signal to the air traffic controller on the ground, showing the pressure altitude the aircraft is flying.

5 A special type of pressure altimeter used to send a signal to the air traffic controller on the ground, showing the pressure altitude the aircraft is flying.

Energy balance equation

1 According to this equation, the net transfer of mechanical energy into and out of the airplane (a function of thrust minus drag) is always equal to the change in its total mechanical energy (a function of altitude and airspeed).

Energy distribution error

1 An energy error where the total mechanical energy is correct, but the distribution between potential (altitude) and kinetic energy (airspeed) is not correct relative to the intended altitude-speed profile. When this error occurs, the pilot will obser

Energy error

1 An altitude and/or airspeed deviation from an intended target expressed in terms of energy. Depending on the airplane’s total amount of energy and its distribution between altitude and airspeed, energy errors are classified as total energy errors, en

Energy exchange

1 Trading one form of energy (e.g., altitude) for another form (e.g., airspeed).

Energy height or total specific energy (ES)

1 Measured in units of height (e.g., feet), it represents the airplane’s total energy per unit weight. It is found by dividing the sum of potential energy and kinetic energy by the airplane’s weight. It also represents the maximum height that an airpla

Energy state

1 The airplane’s total mechanical energy and its distribution between altitude and airspeed.

Energy system

1 A flying airplane is an open energy system. That means that the airplane can gain energy from some source (e.g., fuel) and lose energy to the environment (e.g., surrounding air) . In addition, energy can be added to or removed from the airplane’s tot

Engine pressure ratio (EPR)

1 The ratio of turbine discharge pressure divided by compressor inlet pressure that is used as an indication of the amount of thrust being developed by a turbine engine.

2 The ratio of turbine discharge pressure divided by compressor inlet pressure, which is used as an indication of the amount of thrust being developed by a turbine engine.

Enhanced Flight Vision System (EFVS)

4 An installed aircraft system which uses an electronic means to provide a display of the forward external scene topography (the natural or manmade 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- looking infrared, millimeter wave radiometry, millimeter wave radar, or low-light level image intensification. An EFVS includes the display element, sensors, computers and power supp

En route facilities ring

2 Depicted in the plan view of IAP charts, a circle which designates NAVAIDs, fixes, and intersections that are part of the en route low altitude airway structure.

5 Depicted in the plan view of IAP charts, a circle which designates NA V AIDs, fixes, and intersections that are part of the en route low altitude airway structure.

En Route Flight Advisory Service (EFAS)

5 An en route weather-only AFSS service.

En route high-altitude charts

2 Aeronautical charts for en route instrument navigation at or above 18,000 feet MSL.

5 Aeronautical charts for en route instrument navigation at or above 18,000 feet MSL.

En route low-altitude charts

2 Aeronautical charts for en route IFR navigation below 18,000 feet MSL.

5 Aeronautical charts for en route IFR navigation below 18,000 feet MSL.

En Route Obstacle Clearance Areas

4 Obstacle clearance areas for en route planning are identified as primary, secondary, and turning areas, and they are designed to provide obstacle clearance route protection width for airways and routes.

Environmental systems

1 In an aircraft, the systems, including the supplemental oxygen systems, air conditioning systems, heaters, and pressurization systems, which make it possible for an occupant to function at high altitude.

EPR

2 See engine pressure ratio.

Equilibrium

1 A condition that exists within a body when the sum of the moments of all of the forces acting on the body is equal to zero. In aerodynamics, equilibrium is when all opposing forces acting on an aircraft are balanced (steady, unaccelerated flight cond

2 A condition that exists within a body when the sum of the moments of all of the forces acting on the body is equal to zero. In aerodynamics, equilibrium is when all opposing forces acting on an aircraft are balanced (steady, unaccelerated flight cond

Equivalent airspeed

2 Airspeed equivalent to CAS in standard atmosphere at sea level. As the airspeed and pressure altitude increase, the CAS becomes higher than it should be, and a correction for compression must be subtracted from the CAS.

5 Airspeed equivalent to CAS in standard atmosphere at sea level. As the airspeed and pressure altitude increase, the CAS becomes higher than it should be, and a correction for compression must be subtracted from the CAS.

Equivalent shaft horsepower (ESHP)

1 A measurement of the total horsepower of a turboprop engine, including that provided by jet thrust.

Evaporation

2 The transformation of a liquid to a gaseous state, such as the change of water to water vapor.

Exercise

7 A principle of learning emphasizing that those things most often repeated are best remembered.

Exhaust

1 The rear opening of a turbine engine exhaust duct. The nozzle acts as an orifice, the size of which determines the density and velocity of the gases as they emerge from the engine.

Exhaust gas temperature (EGT)

1 The temperature of the exhaust gases as they leave the cylinders of a reciprocating engine or the turbine section of a turbine engine.

2 The temperature of the exhaust gases as they leave the cylinders of a reciprocating engine or the turbine section of a turbine engine.

Exhaust manifold

1 The part of the engine that collects exhaust gases leaving the cylinders.

Expanded Service Volume

4 When ATC or a procedures specialist requires the use of a NAVAID beyond the limitations specified for standard service volume, an expanded service volume (ESV) may be established. See standard service volume.

Expect-further-clearance (EFC)

2 The time a pilot can expect to receive clearance beyond a clearance limit.

5 The time a pilot can expect to receive clearance beyond a clearance limit.

Explosive decompression

2 A change in cabin pressure faster than the lungs can decompress. Lung damage is possible.