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shorted and allowed to stand for several hours with the shorting straps in place. Then the battery is given a
constant-current charge to restore 140% of its ampere-hour capacity.
equalizer circuit (aircraft generator system). A circuit used in a multiengine generator system that
causes the generators to share the electrical load equally. A low-resistance shunt, called an equalizing
resistor, is installed between each generator and ground so all the current produced by the generator flows
through it. The voltage drop across the equalizing resistors is sensed by the voltage regulators to control the
output of the generators.
When one generator carries more than its share of the load, the voltage drop across its equalizing
resistor is greater than that across the resistors of the other generators.
The voltage regulators sense this difference and decrease the voltage of the generator carrying the
greater part of the load, and in this way force the other generators to carry their share.
equalizing resistor. A large resistor in the ground circuit of a heavy-duty aircraft generator through which
all of the generator output current flows. The voltage drop across this resistor is used to produce the current
in the paralleling circuit that forces the generators to share the electrical load equally.
equipment ground (electrical equipment). A connection inside a piece of electrical equipment between a
metal part that does not carry current and the earth ground. Equipment ground is carried out of the
equipment through a green wire connected to the round pin in the standard three-pin electrical plug.
The function of equipment ground is to reduce the possibility of electrical shock.
equipment list (aircraft documentation). A list of all the equipment approved for installation on a
particular aircraft. An equipment list itemizing the approved equipment installed on the aircraft must be
kept current and with the aircraft records.
equivalent airspeed. Calibrated airspeed corrected for errors caused by the compressibility of the air inside
the pitot tube. Calibrated airspeed is the airspeed shown on the airspeed indicator, corrected for errors
caused by the instrument installation.
14 CFR Part 1: “The calibrated airspeed of an aircraft corrected for adiabatic compressible flow
for the particular altitude. Equivalent airspeed is equal to calibrated airspeed in standard atmosphere at sea
level.”
equivalent flat-plate area (aerodynamics). The area of a flat surface perpendicular to the direction of
motion of the body that produces the same opposition to the airflow as the streamlined body.
equivalent resistance (electrical circuit). The resistance of a single resistor that is the same as that of
several resistors connected in a circuit.
erbium. A soft, malleable, silvery, rare-earth chemical element. Erbium’s symbol is Er, its atomic number
is 68, and its atomic weight is 167.26. Erbium is used in metallurgy and nuclear research.
erosion. The process in which a material is worn away by a scraping or abrading action.
escape velocity. The speed a flight vehicle must reach in order to escape from the gravitational field of the
earth. The escape velocity on the earth is about seven miles per second.
Because of the smaller gravitational field on Mars, a vehicle leaving Mars would have an escape
velocity of only slightly more than three miles per second.
ESFC (equivalent specific fuel consumption). A measure of the efficiency of a turboprop engine. It is the
number of pounds of fuel burned per hour to produce one equivalent shaft horsepower (ESHP) and is found
by dividing the fuel flow, in pounds per hour, by the ESHP.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 229
ESHP (equivalent shaft horsepower). A measure of the power produced by a turboprop engine. ESHP is
the sum of the shaft horsepower delivered to the propeller and the thrust horsepower produced by the
exhaust gas. The approximate amount of thrust horsepower can be found by dividing the static thrust by
2.6.
established (air traffic control). To be stable or fixed on a route, route segment, altitude, heading, etc.
estimated ceiling (meteorology). A ceiling classification applied when the ceiling height has been
estimated by the observer. The term estimated also applies when the ceiling has been determined by some
other method, but because of the specified limits of time, distance, or precipitation conditions, a more
descriptive classification cannot be applied.
estimated elapsed time (ICAO). The estimated time required to proceed from one significant point to
another.
estimated off-block time (ICAO). The estimated time at which the aircraft will commence movement
　
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