the Aviation Dictionary

cathode-ray tube (CRT) CENRAP
made to strike the inside of the tube where they cause
the coating of the tube to glow. Recurring voltage
changes are displayed on the tube in the form of a
green line.
cathode-ray tube (CRT) - An elcctron tube in which a
stream of electrons (cathode rays) from an electron gun
impinges upon a fluorescent screen, thus producing a
bright spot on the screen. The electron beam is
deflected electrically or magnetically to produce
patterns on the screen. Also referred to as a display
tube.
cation - A positive charged ion that moves toward the
cathode in the process of electrolysis.
catwalk - A narrow walkway (as along a bridge ur
elevated on the side of a building).
caul plates - In composites, smooth plates used during
the cure process to apply pressure in a uniform manner.
caustic material - Any substance having the ability of
burning, corroding, or eroding other substances by
chemical action.
caustic soda - A common name for sodium hydroxide.
cavitation - A partial vacuum of an area of low pressure
behind an object that is moving in a fluid.
cavity - A hole or hollow within a body or structure.
C-clamp - A metal clamp in
the general shape of the
letter C. It is used to exert
pressure and to temporarily
hold objects together.
C-D inlet or exhaust - 1.
Inlet. The forward section is
convergent to increase air
ceiling light - A light used by weather observers to
measure the height of the bottom of a layer of clouds at
night.
ceilometer - A device used to measure the height of the
bottom layer of clouds above a weather station.
Consists of a light transmitter and receiver separated by
a known horizontal distance. A beam of light shines on
the cloud layer and height is calculated using
trigonometry.
celestial dome - The hemisphere of the sky as observed
from a point on the ground.
celestial navigation -Navigating
sun.
by use of the stars and
cellular combustor - A combustor, or bumer section of
a gas turbine engine, that is made up of eight to ten
individual bumer cans. Thcsc cans are long cylinders
that consist of an outer case or housing within which
there is a perforated stainless steel combustion chamber
liner or inner liner. The can-type combustors are
arranged radially around the axis of the engine.
Compressed air from the compressor flows through the
cans and fuel is sprayed into them and burned to add
energy to the air. Cooling air flows through holes in the
inner liners to keep the temperature of the liners low
enough so that they will not be damaged.
Celluloid - The registered trade name of a thermoplastic
material consisting essentially of cellulose nitrate and
camphor.
cellulose - A material that comes from the cell walls of
plants and is the raw material of many manufactured
goods.
cellulose acetate butyrate - A compound formed by the
action of acetic and butyric acid on cellulose.
pressure and reduce air cellulose acetate butyrate dope - An aircraft dope
velocity to subsonic speed. The aft section is divergent having a cellulose acetate butyratc film base and
to increase air pressure still mher and slow airflow to suitable plasticizers, along with the necessary solvents
approximately Mach 0.5 before entering the engine. 2. and diluents. Butyrate dope has a better tautening effect
Exhaust. The forward section is convergent - to increase on fabric and is less flammable than nitrate dope.
gas pressure. Thc aft section is divergent to increase
cellulosc nitrate - A compound formed by treating
gas velocity to supcrsonic speed. This arrangemcnt is
cellulose with a mixture of nitric and sulfuric acids.
necessary in order for the aircraft to attain supersonic
speed.
cellulose nitrate dope - Aircraft dope consisting of a
Ceconitc - A fabric woven from polyester fibers.
nitrocellulose film base with the appropriate
plasticizers, thinners, and solvents. It has excellent
cciling - In meteorology in the U.S., (1) the height encapsulating properties, but its high flammability has
above the surface of the base of the lowest layer of caused its decrease in popularity as a finish for fabric
clouds or obscuring phenomena aloft that hides more covered aircraft.
than half of the sky, or (2) the vertical visibility into an
Celsius (C)- A temperature scale with zero degrees as
obscuration.
the melting point of pure ice and 100 degrees as the
ceiling balloon - A small balloon used to determine the boiling point of pure water at standard sea level
height of a cloud base or the extent of vertical atmospheric pressure.
visibility.
CENRAP - See center radar ARTS
presentatiodprocessing.
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