the Aviation Dictionary

C calibration
C battery - A small, low-voltage battery. Also referred
to as a C-cell battery or C-cell.
C check - The intermediate level of inspection in a
Continuous Airworthiness Maintenance Program. The
entire program consists of A, C, and D checks.
cabane - An arrangement of struts used to support a
wing above the fuselage of an airplane. Such an
airplane wing attachment is called a parasol.
cabin - That portion of an aircraft used for cargo and/or
passengers.
cabin altitude - Cabin pressure in terms of equivalent
altitude above sea level.
cabin differential pressure - The difference between
the pressure inside a cabin and the outside air pressure.
The maximum cabin differential pressure is determined
by the aircraft structural strength.
cabin pressure regulator - A means of controlling
cabin pressure by regulating the outflow of air from the
cabin.
cabin pressurization safety valve - A combination
pressure and vacuum relief and dump valve used to
prevent cabin pressurization exceeding safe limits.
cabin supercharger - Mechanical air pumps used to
provide the air pressure for cabin pressurization.
cabinet file - A coarse file that is flat on one face, and
rounded on the other face, used for metalworking and
woodworking. Sometimes referred to as a half-round
file.
cable - I. In common usage, any heavy conductor. 2. In
electronics, two or more conductive paths bound into a
single package. 3. A group of insulated electric
conductors usually covered with rubber or plastic to
form a flexible transmission line. 4. A stranded wire
generally composed of a number of wires enclosed in a
single bundle or group.
cable control - The system of operating aircraft controls
by the use of high-strength flexible steel cables.
cable drum - A cylindrically shaped spool around
which a control cable is wound to increase the amount
of cable moved each time the handle is turned.
cable guard - A pin installed in the flange of a control
cable pulley bracket to prevent the cable from jumping
out of the pulley grooves.
cable rigging tension chart - Charts showing the
relationship between control cable tension and
temperature.
cadmium - A bluish-white, malleable, ductile, toxic,
metallic chemical element with a symbol of Cd and an
atomic number of 48.
cadmium cell - A basic unit of the nickel-cadmium
battery. It consists of positive and negative plates,
separators, electrolyte, a cell vent, and a cell container.
The positive plates are made from porous plaque on
which nickel-hydroxide is deposited. The negative
plates are made from similar plaques on which
cadmium-hydroxide is deposited. The voltage that is
produced by a cadmium cell at 20°C is 1.0186 volts.
cadmium plating - A thin coating of cadmium metal
electroplated on a steel part to protect the steel from
corrosion. This is accomplished by the cadmium
serving as the anode in a corrosive action.
caging device - A mechanism used in a gyroscopic
instrument to erect the rotor of a gyro to its normal
operating position prior to flight or after tumbling.
caging system - See caging device.
calcium - A hard metallic element with a symbol of Ca
and an atomic number of 20. Used as an alloying
element with other metals.
calcium carbide - A combination of calcium and
carbon. Reacts chemically with water to produce
acetylene gas.
calculated landing time - A term that can be used in
place of tentative or actual calculated landing time,
whichever applies.
calendar month - The measure of time used by the
Federal Aviation Administration for inspections and
certification purposes. A calendar month ends at
midnight of the last day of the month, regardless of the
day it began.
calendering - The process of dipping cotton yarn or
fabric into a hot solution of caustic soda to shrink the
material and give it greater strength and luster.
calibrate - A procedure in which the indication of an
instrument is compared with a standard value in order
to inspect and correct the graduations of a measuring
device.
calibrated airspeed (CAS) - The indicated airspeed of
an aircraft, corrected for position and instrument error.
Calibrated airspeed is equal to true airspeed in standard
atmosphere at sea level.
calibrated orifice - A hole with a specific internal
diameter used to measure or control the amount of flow
through it.
calibration - Testing the accuracy of a measuring
instrument or scale by comparing it with a known
standard.
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