the Aviation Dictionary

cockpit - The pilot's compartment of an aircraft.
cockpit resource management (CRM)- Effective use
of all resources by a flight crew. Emphasis on good
communication and interpersonal skills.
code markings -Aircraft fluid lines are often identified
by markers of color codes, words, and geometric
symbols. These identify each line's function, content,
direction of fluid flow, and primary hazard.
codes, transponder - The number assigned to a
particular multiple pulse reply signal transmitted by a
- -
transponder.
coefficient - A dimensionless number expressing degree
of magnitude.
coefficient of expansion - A dimensionless number
relating dimensional changes in a material with
changes in temperature.
coefficient of friction - The coefficient of friction is the
value obtained by dividing the force necessary to move
one substance over another at a constant speed by the
weight of the substance.
coefficient of linear expansion - A value obtained by
measuring the length (inches or centimeters) a material
expands per degree Celsius change in temperature, i.e.
the thermal expansion properties.
cockpit cold circuit
coil - A conductor consisting of turns of wire in which
the magnetic field around one turn cuts across the other
turns, increasing the inductive effect of the wire.
coil assembly - The magneto coil assembly consists of a
soft iron core around which is wound the primary and
secondary coil with the secondary coil wound on top of
the primary coil.
coil booster - A transformer coil used with a vibrator to
produce a high voltage at the spark plugs during
starting.
coil spring - A spiral of hardened steel wire. When
loosely wound, it is used in compression applications
to provide cushioning, while tightly wound coils are
used in tension applications.
coin dimpling - Performed by a special machine that
has, in addition to the usual dies, a "coining ram." This
ram applies an opposing pressure to the edges of the
hole so that the metal is made to flow into all the sharp
contours of the die giving the dimple greater accuracy
and improving the fit.
coin pressing - A dimpling process using a countersunk
rivet as the male dimpling die, placing the female die in
the usual position, and backing it with a bucking bar.
The rivet is then struck with a pneumatic hammer to
form the dimple.
coenicient of thermal expansion - The change in unit coin tap - In composites, the use of a coin to tap a
of length of volume accompanying a change of laminate in different spots to detect a change in sound,
temperature.
which would indicate the presence of a defect.
coercive force - The amount of force (in the form of
magnetism with opposite polarity) required to remove
magnetism from an object.
cog belt - A drive belt that incorporates teeth on the
drive surface in order to prevent slippage. Cog belts are
often used in systems where timing is critical.
cognitive domain - A grouping of levels of learning
associated with mental activity which range from
knowledge through comprehension, application,
analysis, and synthesis to evaluation.
cognitive information processing - The method in
which information is - gathered, vrocessed, and stored
by the brain in much the same way as a computer.
cognitive theory - Learning is not just a change in
outward behavior but involves changes in thinking,
feeling, or understanding. It involves mental processes,
such as decision making and problem solving, which
are difficult, if not impossible, to observe or measure.
coherent light - Light such as that produced by a laser,
made up of waves of the same wavelength and in
phase. Ordinary light consists of light of different
wavelengths and phase relations.
cohesion - The tendency of a single substance to adhere
to itself. The force holding a single substance together.
Aircraft Technical Book Company
P.O. Box 270
Tabernash, CO 80478
http:llw.ACTechbooks.com
coke - A solid, carbon-like residue left by mineral oil
after the removal of the volatile material by heat.
coking - The carbon buildup from decomposition of oil
in vent lines. This buildup can, over a period of time,
cause a restriction of flow.
cold - The absence of heat.
cold air funnel - A weak vortex that occasionally
develops behind a cold front with rainshowers and
nonsevere thunderstorms.
cold airmass - An airmass that is colder than the ground
it is passing over.
cold bending - The bending of sheet metal without the
use of heat. Thin sheets ofmetal and some soft metals
are bent in this manner. Thick sheets of metal and some
harder materials must be heated to allow bending
without causing the material to break.
cold chisel - A hardened steel cutting tool. Used to cut
metal materials without the need for softening by use
of heat.
cold circuit - An electrical circuit without power. As
opposed to a "hot circuit" that has electrical power
applied.