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the entire weight of the WSC 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.
Certified Flight Instructor with a Sport Pilot Rating
(CFIS). A flight instructor authorized by the FAA to provide
flight instruction in designated category of aircraft for sport
pilots only.
CFI. See Certified Flight Instructor.
CFIS. See Certified Flight Instructor with a Sport Pilot
Rating.
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.
Circuit breaker. A circuit-protecting device that opens
the circuit in case of excess current flow. A circuit breaker
differs from a fuse in that it can be reset without having to
be replaced.
CL. See coefficient of lift.
Class A Airspace. Airspace from 18,000 feet MSL up to
and including FL 600, including the airspace overlying the
waters within 12 NM of the 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.
G-5
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 individually
tailored, the airspace usually consists of a 5 NM radius core
surface area that extends from the surface up to 4,000 feet
above the airport elevation, and a 10 NM radius shelf area
that extends from 1,200 feet to 4,000 feet above the airport
elevation.
Class D Airspace. Airspace from the surface to 2,500 feet
above the airport elevation (charted in MSL) surrounding
those airports that have an operational control tower. The
configuration of each Class D airspace area is individually
tailored, and when instrument procedures are published,
the airspace will normally be designed to contain the
procedures.
Class E Airspace. Airspace that is not Class A, Class B,
Class C, or Class D, and is controlled airspace.
Class G Airspace. Airspace that is uncontrolled, except
when associated with a temporary control tower, and has
not been designated as Class A, Class B, Class C, Class D,
or Class E airspace.
Clear air turbulence. Turbulence not associated with any
visible moisture.
Clearance. ATC permission for an aircraft to proceed under
specified traffic conditions within controlled airspace, for the
purpose of providing separation between known aircraft.
Code of Federal Regulations (CFR). Regulations issued
　
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