the Aviation Dictionary

convective lifting copper
occurs at this level, the layer between the surface and convergent-divergent inlet - A supersonic engine inlet
the CCL will be thoroughly mixed, temperature lapse duct. The forward section is convergent to increase air
rate will be dry adiabatic, and mixing ratio will be pressure and reduce air velocity to subsonic speed. The
constant.
aft section is divergent to increase air pressure still
further and slow airflow to approximately Mach 0.5
convective lifting - In unstable atmospheric conditions,
before entering the engine.
a parcel of air warmer than its surroundings rises.
conversion coating - A chemical solution used to form
convective sigmet - A weather advisory concerning
a dense, nonporous oxide or phosphate film on the
convective weather significant to the safety of all
surface of aluminum or magnesium alloys.
aircraft. Convective SIGMET's are issued for
tornadoes, lines of thunderstorms, embedded converter - A circuit in the control box of an anti-skid
thunderstorms of any intensity level, areas of system using AC wheel speed sensors. It converts
thunderstorms greater than or equal to VIP (video changes in AC frequency into changes in DC voltage.
integrator and processor thunderstorm intensity
standard) level 4 with an area coverage of 4/10 (40%)
convex - Having a surface that curves outward.
or more, and hail 314 inch or greater. convey -To communicate or transmit.
convective significant meteorological information - convoluted - Involved, intricate. Often used to describe
See Convective SIGMET.
routing of tubing or conduit that winds circuitously
around and through other components.
conventional - Conforming to formal or accepted
standards in drawings - or rules.
coolant - A fluid used to remove heat from a system or
conventional current - Current flowing in an electrical
component. Anti-freeze is used to remove heat from a
reciprocating engine and a coolant oil is used to
circuit from positive to negative, outside the power
remove heat from cutting tools.
source. This current flow theory is not in common use
today.
cooling fins - Ribs projecting from the surface of a
conventional landing gear - A landing gear with
component to increase-its area so that heat may be
more easily transferred into the airstream flowing over
wheels attached to a strut assembly located forward of
the fins.
the center of gravity and either a skid or wheel
assembly at the tail.
cooperative or group learning - An instructional
strategy which organizes students into small groups so
conventional tail - An aircraft design with the
that they can work together to maximize their own and
horizontal stabilizer mounted at the bottom of the
each other's learning.
vertical stabilizer.
coordinated universal time - Greenwich Mean Time.
converge - The process of two objects moving closer to
Referred to as coordinated universal time because the
each other. Two lines forming an angle are said to
time is the average of the times from a network of
converge at that angle.
atomic clocks around the world. Abbreviated UTC.
convergence - In meteorology, the condition that exists (Formerly abbreviated Z.)
when the distribution of winds within a given area is
such that there is a net horizontal inflow of air into the
area.
convergence zone - In meteorology, an area of
convergence, sometimes several miles wide, at other
times very narrow. In soaring these zones often provide
organized lift for many miles along the convergence,
for instance, a sea-breeze front.
convergent duct - In gas turbine engines, a cone-shaped
passage or channel in which a gas may be made to flow
from its largest area to its smallest area, resulting in an
increase in velocity and a decrease in pressure.
Referred to as nozzle shaped. With this relationship
present, the weight of airflow will remain constant.
convergent-divergent exhaust - An afterburner design,
a supersonic exhaust duct. The forward section is
convergent to increase gas pressure. The aft section is
divergent to increase gas velocity to supersonic speed.
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coordinates - The intersection of lines of reference,
usually expressed in degrees/minutesl seconds of
latitude and longitude, used to determine position or
location.
coordination fix - The fix in relation to which facilities
will handoff, transfer control of an aircraft, or
coordinate flight progress data. For terminal facilities,
it may also serve as a clearance for arriving aircraft.
copal resins - A natural resin that is used in some
aircraft finishes.
copilot - A pilot on a flight crew who assists in flying
the aircraft, but who is not the pilot-in-command.
coping saw - A small handsaw with a U-shaped frame
and a thin blade. Used for making curved cuts.
copper - A metallic element with a symbol of Cu and an
atomic number of 29.