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AUTOMATIC TERMINAL INFORMATION SERVICE
(ATIS)—The continuous broadcast (by radio
or telephone) of recorded noncontrol, essential
but routine, information in selected terminal areas.
AVIATION MEDICAL EXAMINER (AME)—A
medical doctor authorized to perform aviation
medical exams for aviators.
BANK ATTITUDE—The angle of the lateral axis
relative to the horizon.
BASE LEG—A flight path at right angles to the
landing runway off its approach end. The base leg
normally extends from the downwind leg to the
intersection of the extended runway centerline.
CAMBER—The curvature of a wing when looking
at a cross section. A wing has upper camber
on its top surface and lower camber on its bottom
surface.
CANOPY—The fabric body of a parachute.
CARBURETOR ICE—Ice that forms inside the carburetor
due to the temperature drop caused by the
vaporization of the fuel. Induction system icing
is an operational hazard because it can cut off the
flow of the fuel/air charge or vary the fuel/air ratio.
CART—The engine and seats, attached by a structure
to wheels; sometimes referred to as the fuselage,
cockpit, chaise, or airframe.
CAVITATION—A condition that exists in a fluid
pump when there is not enough pressure in the
reservoir to force fluid to the inlet of the pump.
The pump picks up air instead of fluid.
CENTER OF GRAVITY (CG)—The point at which
an aircraft would balance if it were possible to
suspend it at that point. It is the mass center of the
aircraft, or the theoretical point at which the entire
weight of the PPC is assumed to be concentrated.
It may be expressed in inches from the reference
datum, or in percent of mean aerodynamic chord
(MAC). The location depends on the distribution
of weight in the aircraft.
CENTER OF LIFT—The location along the chord
line of an airfoil at which all the lift forces produced
by the airfoil are considered to be concentrated.
CENTER OF PRESSURE (CP)—The point along
the wing chord line where lift is considered to be
concentrated.
CENTRIFUGAL FORCE—The apparent force
occurring in curvilinear motion acting to deflect
objects outward from the axis of rotation. For
instance, when pulling out of a dive, it is the force
pushing you down in your seat.
CENTRIPETAL FORCE—The force in curvilinear
motion acting toward the axis of rotation. For
instance, when pulling out of a dive, it is the force
that the seat exerts on the pilot to offset the centrifugal
force.
CERTIFICATED FLIGHT INSTRUCTOR (CFI)—
A flight instructor authorized by the FAA to
provide flight instruction in designated category of
aircraft.
CFI—See CERTIFIED FLIGHT INSTRUCTOR.
CFR—See CODE OF FEDERAL REGULATIONS.
CG—See CENTER OF GRAVITY.
CHECKLIST—A list of procedures that provides
a logical and standardized method to operate a
particular make and model aircraft.
CHECKRIDE—A practical test administered by
an FAA examiner or designated examiner for the
purpose of issuing an FAA certificate or rating.
CHORD LINE—An imaginary straight line drawn
through an airfoil from the leading edge to the
trailing edge.
CLASS A AIRSPACE—Airspace from 18,000 feet
MSL up to and including FL600, including the
airspace overlying the waters within 12 NM of the
G-3
coast of the 48 contiguous states and Alaska; and
designated international airspace beyond 12 NM
of the coast of the 48 contiguous states and Alaska
within areas of domestic radio navigational signal
or ATC radar coverage, and within which domestic
procedures are applied.
CLASS B AIRSPACE—Airspace from the surface
to 10,000 feet MSL surrounding the nation’s
busiest airports in terms of IFR operations or passenger
numbers. The configuration of each Class
B airspace is individually tailored and consists
of a surface area and two or more layers, and is
designed to contain all published instrument procedures
once an aircraft enters the airspace. For all
aircraft, an ATC clearance is required to operate in
the area, and aircraft so cleared receive separation
services within the airspace.
CLASS C AIRSPACE—Airspace from the surface
to 4,000 feet above the airport elevation (charted
in MSL) surrounding those airports having an
operational control tower, serviced by radar approach
control, and having a certain number of
IFR operations or passenger numbers. Although
the configuration of each Class C airspace area is
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