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Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 159
as a thermal insulating material.
cornice brake (sheet metalworking tool). A large shop tool used to make straight bends across a sheet of
metal. The sheet of metal is clamped in the brake, and a heavy steel leaf is lifted to bend the metal. The
distance between the clamping jaw and the hinge line of the leaf determines the radius of the bend. Cornice
brakes are often called leaf brakes.
corona (meteorology). A prismatically colored circle or arc of a circle with the sun or moon at its center.
The color of a corona changes from blue inside to red outside, which is opposite to that of a halo. Coronas
vary in size and are much smaller than the fixed size of a halo.
Coronas form in middle clouds, which are composed of water droplets, and halos form in cirriform
clouds, which are composed of ice crystals.
corona (electrical discharge). A discharge of electricity that appears as a bluish-purple glow on the
surface of a conductor when the voltage on the conductor exceeds a certain critical value.
Corona is caused by the ionization of the gases surrounding the conductor.
corona loss. Power loss caused by ionization of the gas surrounding a high-voltage conductor.
corposant (meteorology). Another name for Saint Elmo’s fire. This is a visible electrical discharge from
pointed objects when the air is highly charged electrically.
corrected altitude. Indicated altitude shown on an aircraft altimeter corrected for nonstandard temperature
of the air. The correction is based on the estimated difference between the existing temperature and the
standard atmospheric temperature. Corrected altitude is an approximation of true altitude.
correlation box (helicopter engine control unit). A component in the reciprocating engine controls for a
helicopter that automatically increases and decreases the amount of throttle opening as the collective pitch
control is raised or lowered.
The final adjustment of the power must be done by the twist grip, because the correlation box does
not adjust for nonstandard atmospheric conditions.
corrosion. An electrolytic action which takes place inside a metal or on its surface. The metal reacts with
an electrolyte, and part of the metal is changed into a salt, which is the corrosion. Corrosion is dry and
powdery and has no physical strength.
corrosion inhibiting primer (aircraft finishing system component). A primer which prevents, or at least
slows, the formation of corrosion in the metal it covers.
corrosion inhibitor. A material used to stop or slow the action of corrosion. To protect aluminum and
magnesium alloys from corrosion, a tight, continuous oxide film is deposited on the surface. This film acts
as a corrosion inhibitor.
corrosion prevention compound (reciprocating engine preservative). A special oil that has little
tendency to run off of a surface on which it is sprayed. Corrosion prevention compound is sprayed into the
cylinders of a reciprocating engine when it is to be stored. This compound forms an airtight seal over the
surface of the metal and keeps air and moisture away from the surface. When air and moisture cannot reach
the metal, corrosion or rust cannot form on it.
corrosion-resistant steel. Steel alloyed with nickel and chromium, to increase its resistance to corrosion or
rust. Corrosion-resistant steel is also called stainless steel.
corrugate. To form ridges or waves in a piece of material to increase its rigidity.
corrugated fastener (wood fastener). A small strip of corrugated steel ground on one edge to form a
series of sharp points. Corrugated fasteners are driven into butt joints in wood to fasten the pieces together.
corrugated sheet metal. Sheets of metal that have been made more rigid by forming a series of parallel
ridges or waves in their surfaces.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 160
cosecant (trigonometric function). The trigonometric function which is the ratio of the length of the
hypotenuse of a right triangle to the length of the side opposite an acute angle.
cosine (trigonometric function). The trigonometric function which is the ratio of the length of the side
adjacent to an acute angle in a right triangle to the length of the hypotenuse.
cosmic ray. A stream of electrons and hydrogen atom nuclei that comes from outer space, penetrates the
earth’s atmosphere, and strikes the earth from all directions. Cosmic rays travel at the speed of light.
cotangent (trigonometric function). The trigonometric function which is the ratio of the length of the side
adjacent to an acute angle in a right triangle to the length of the side opposite the angle.
　
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