the Aviation Dictionary

collective pitch control . comma cloud
the head or shank of a fastener.
squaring device that is machined with precise 90" and
collective pitch control - The control in a helicopter in
45" angles.
which the pitch of all the rotor blades are changed at combination wrench - A tool that has a box-end
the same time.
wrench on one end and an open-end wrench on the
collective pitch control - In rotorcraft, the control for
other.
changing the pitch of all the rotor blades in the main combined center-RAPCON (CERAP)- An air traffic
rotor system equally and simultaneously and, facility which combines the functions of an ARTCC
consequently, the amount of lift or thrust being and a radar approach control facility.
generated.
combustibles - Materials capable of burning. -
collector - 1. The electrode in a transistor through which
combustion - A chemical process in which a material is
conventional current leaves the transistor. 2. The
united with oxygen at such a rapid rate that light and
exhaust cone collector in a turbine engine that collects
heat are released.
the exhaust gases - discharged - from the engine - turbine
buckets and gradually converts them into a solid jet. In combustion chamber - The section of the engine into
performing this, the velocity of the gases is decreased which fuel is injected and burned. See also combustor.
slightly and the pressure increased. It also helps to
direct the flow of hot gases rearward and prevents
combustion liner - In a turbine engine, the perforated
turbulence and, at the same time, imparts a high final
and louvered inner section of the combustor in which
exit velocity to the gases.
fuel burning is controlled.
collector ring - A corrosion-resistant steel assembly
combustion liner louvers - In a turbine engine, small
that collects the exhaust gases from the cylinders of a
slots in the liner that direct cooling airflow and provide
radial engine and routes them overboard.
the inner walls with a cooling air blanket.
collimated light - An optical device that causes all light
combustion section - The section located directIy
beams passing through to be parallel.
between the compressor and the turbine sections. It
contains a casing, a perforated inner liner, a fuel
color code - A means of identifying an object by the use injection system, some means for initial ignition, and a
of various combinations of colors.
fuel drainage system to drain off unburned fuel after
engine shutdown. The combustion section houses the
color temperature - The approximate temperature of an
combustion process, which raises the temperature of
object, based on the peak intensity-emitting wavelength
the air passing though the engine. This process releases
(its color). Specified in degrees Kelvin.
energy contained in the aidfuel mixture.
color tempering - A method of removing brittleness
combustion starter - A fuel engine starting accessory
from a part during heat treatment. The part is heated to
that utilizes a combustion section similar to a turbine
a specified color, then quenched (cooled by dipping
engine combustor. Combustion products are exhausted
into a specified liquid).
through a turbine connected to a reduction gearbox to
color wheel - A circular diagram or tool that helps the create starting torque.
user visualize colors that result when colors are mixed
combustor - In gas turbine engines, the section of the
together.
engine into which fuel is injected and burned to create
combination compressor - In turbine engines, a expansion of the gases.
compressor design that utilizes an axial compressor and
combustor drain valve - A spring-loaded valve in a
a centrihgal compressor (usually attached together) to
turbine engine that drains excess fuel from the
compress incoming air prior to combustion.
combustion section when the engine is not running. It
combination inertia starter - An inertia starter for is normally open and is held closed by the of
reciprocating aircraft engines that can be energized by combustion when the engine is operating.
either an electric motor or a hand crank.
combustor efficiency - A measure of the percentage of
combination set - A set of measuring tools that often fuel burned completely or Btus of heat attained as
includes a tri-square, a 45"
opposed to the Btu potential of fuel introduced. Typical
miter, a depth gauge, a
figures are in the 99% range.
marking or scribing gauge,
coming-in speed - The speed of a magneto that is just
and a level.
sufficient to produce the voltage required to fire all of
combination square - A
the spark plugs consistently.
device used in laying out
comma cloud - A cloud mass shaped like a comma as
material. It consists of a
seen in satellite imagery.
steel scale attached to a
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