the Aviation Dictionary

carbon monoxide (CO) . carburetor float
pressing against the microphone change its resistance, carbon tracking - A fine track of carbon deposited
thus modulating the voltage and creating the electronic inside the magneto, distributor, or terminal cavity of a
signal that is transmitted to a receiver.
spark plug as a result of a flashover. It acts as an
electrical conductor to ground or to another electrical
carbon monoxide (CO)- A colorless, odorless, highly
lead.
toxic gas that forms from incomplete combustion of a
hydrocarbon fuel.
carbon/graphite fiber or fabric - A fiber used in
advanced composites comprised of carbon filaments
carbon monoxide detector - A device used to detect
which may be woven together. The terms carbon and
the presence and concentration of carbon monoxide
graphite have been used interchangeably for years. The
gas.
Americans prefer the term graphite, while the
carbon oil seal - An oil seal used in gas turbine engines. Europeans prefer carbon. Depending on the
These seals are usually spring loaded and are similar in manufacturer of the aircraft, different terms may be
material and application to the carbon brushes used in used. The tern CarbonIGraphite is used throughout this
electrical motors. Carbon seals rest against - a surface to book to include both terms.
prevent oil from leaking out along the shaft into the
carbonaceous - Containing carbon.
compressor airflow or the turbine sections.
carbon-film resistor - An electrical resistor composed
carbon pile resistor - A variable resistor used in some
of a thin film of carbon on a ceramic cylinder. Wires
electrical equipment. A carbon pile is made of a stack
connected to each end of the carbon film allow the
of thin, pure carbon disks. Its resistance is changed by
resistor to be connected to an electrical circuit.
varying the amount of pressure applied to the stack.
carbon-zinc cell - A portable primary cell such as a
carbon pile voltage regulator - A voltage regulator that
flashlight battery consisting of a carbon rod placed in a
depends on the resistance of a number of carbon disks
can made of zinc and filled with a paste of ammonium
arranged in a pile or stack. The resistance of the carbon
chloride. The chemical reaction between the paste and
stack varies inversely with the pressure applied. When
zinc causes electrons to leave the zinc can and travel
the stack is compressed under appreciable pressure, the
through an external circuit to the carbon rod.
resistance in the stack is less. Pressure on the carbon
pile depends upon two opposing forces: a spring and an carborundum - A manufactured aluminum oxide
electromagnet. The spring compresses the carbon pile, abrasive similar to natural emery. It is used for
and the electromagnet exerts a pull that decreases the grinding wheels and abrasive papers.
pressure. When the generator voltage varies, the pull of
carburetor - 1. Pressure: A hydromechanical device
the electromagnet varies, thereby increasing or
employing a closed feed system from the fuel pump to
decreasing the pressure on the disks. This change
the discharge nozzle. Tt meters fuel through fixed jets
allows a change in the generator output voltage.
according - to the mass airflow through - the throttle body
carbon resistor - An electrical component used to put a and discharges it under a positive pressure. Pressure
controlled amount of resistance in an electrical circuit. carburetors -are distinctly -different from float-type
Carbon resistors are composed of a rod of compressed carburetors, as they do not incorporate a vented float
graphite and binding material with wire leads, called chamber or suction pickup from a discharge nozzle
"pigtail" leads, attached to each end of the resistor. located in the venturi tube. 2. Float-type: Consists
Colored bands marked on the resistor indicate its essentially of a main air passage through which the
resistance value.
engine draws its supply of air, a mechanism to control
thequantity of fuel discharged in relation to the flow of
carbon seal - A heat-resistant device used in turbine
air, and a means of regulating the quantity of fuellair
engines to seal the lubricating oil in the bearing cavity.
mixture delivered to the engine cylinders.
A ring of carbon material rides on a highly polished
metal-surface to prevent lubricating oil from seeping carburetor air temperature - The temperature of the
into the gas path. Usually located at main bearings.
induction air before it enters the carburetor. The
temperature of the air as it enters the carburetor must
carbon steel - A group of iron alloys having carbon as
be controlled to keep the heyair mixture temperature
the principal alloying agent. Low-carbon steel contains
high enough to prevent water from condensing out of
less than 0.20% carbon and is not as strong as highthe
air and freezing and low enough to prevent
carbon steel that contains up to 0.95% carbon.
detonation.
carbon tetrachloride (Halon 104) - Once used as a fire
carbureror - A component between the fuel
extinguishing agent. A chemical formula CC14, a liquid
supply and the metering system of a carburetor. The
with a UL toxicity rating of 3. When used as a fire
float chamber provides a nearly constant level of fuel
extinguishing agent it becomes very toxic and harmful
to the main discharge nozzle. The float is connected to
to humans and other animals.
a needle valve and seat that meters the correct amount
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