the Aviation Dictionary

gear backlash - The measured clearance between the
teeth of meshed gears.
gear indicators - Indicators in the cockpit of an airplane
having retractable landing gear to inform the pilot of
the position of the gear. It will indicate whether they
are down and locked, in transit, or up and locked.
gear preload - The pressure with which two gears mate
or mesh together.
gear-driven supercharger - An internal, engine-driven
supercharger on a reciprocating engine driven from the
crankshaft through a gear arrangement.
geared fan - A design that allows a fan to rotate at a
different speed than the compressor rotor. The fan
being geared down allows for higher speeds in the
compressor without creating excessive tip speeds on
the fan.
geared fan gas turbine engine -A turbofan engine that
uses a set of reduction gears between the first stage of
the gas generator compressor and the fan.
geared propeller - A propeller driven from the
crankshaft through a series of reduction gears. This
allows the engine to operate at an efficient speed while
holding the propeller RPM in its efficient range.
gear-type pump - A power-driven fluid pump, usually
a constant displacement-type pump, driven by the
engine accessory drive and
used to pump fluid under
pressure. The gear-type
pump is made up of two
meshed spur gears
mounted in a close-fitting
housing. Fluid is taken into
the inlet side of the
housing and fills the space
between the teeth of both
gears. As the fluid is carried around the housing of the
rotating gears to the discharge side of the the
gear teeth mesh and the fluid is forced out of the outlet
side of the pump.
gel - A jelly-like substance formed by the coagulation of
a solution into a solid phase.
gel coat - In composites, a coating of resin, generally
pigmented, applied to the mold or part to produce a
smooth finish. Considered a nonstructural finish.
gel time - In composites, the period of time from the
initial mixing of the reactants of a liquid material
composition to the point in time when gelation occurs,
as defined by a specific test method.
gelatinous - Having the consistency of gelatin or jelly.
gelled cell battery - A lead-acid battery that has a
gelling agent added to the electrolyte to make it
non-spillable and retain a high level of electrolyte in
the battery.
genemotor - A machine with two windings on a single
armature that operates simultaneously as a motor with
one of the windings and as a generator with the other.
The armature windings are usually different so that the
voltage on the generator side is different from the
voltage on the motor side and the machine acts as a
rotary transformer. Also referred to as a dynamotor.
general aviation - The portion of the aviation industry
that covers all of aviation with the exception of
military, public-use aircraft, and the airlines.
General Aviation District Office (GADO) -
Designated FAA Field Offices staffed to serve the
general public and aviation industry on matters
pertaining to the certification, maintenance, and
operation of general aviation.
general circulation - The wind system that extends
over the entire globe; it is a macroscale phenomena
with a typical horizontal dimension of 10,000 nautical
miles.
generator - A mechanical device consisting of a
conductor being turned within a magnetic field.
Produces electricity by electromagnetic induction.
generator current limiter - A special high-current fuse
capable of carrying momentary current overloads.
However, it will melt and open the circuit under
current flows that might damage the generator. These
are used in generator installations that are not protected
by automatic current limiters.
CEO map - The digitized map markings associated
with the ASR-9 Radar System.
geodetic construction - A form of aircraft construction
in which the stress carrying portion of the skin is made
up of a lattice work of thin metal or wood strips.
geographic poles - The poles of the axis about which
the Earth rotates. They form true north and true south.
geometric pitch - The distance a propeller should
advance in one revolution without any slip.
geostrophic balance - The balance of forces that exists
when Coriolis force and pressure gradient force are
equal in magnitude but in the opposite direction.
geostrophic wind - The wind that occurs when Coriolis
force and pressure gradient are equal and opposite.
German silver - Metals of the copper/nickel/zinc alloy
family. Also referred to as nickel silver.
germanium - A grayish-white metallic chemical with a
symbol of Ge and an atomic number of 32. Often it is
used in the manufacturing of semiconductor devices
such as diodes and transistors.
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