the Aviation Dictionary

aerodynamic balance - The portion of a control surface
on an airplane that extends ahead of the hinge line.
This utilizes the airflow about the aircraft to aid in
moving the surface.
aerodynamic balance . aeronautical chart
aerodynamic twisting force (ATF)- One of the five
forces acting on a rotating propeller. The aerodynamic
twisting force tends to twist the blade angle toward the
feather position.
aerodynamic blockage thrust reverser - A aerodynamic twisting moment - A rotational force
configuration of thrust reverser used in turbojet engines applied to an object due to aerodynamic loads on the
in which thin airfoils or obstructions are placed in the object. Usually a concern in the design of propellers,
engine's exhaust stream to duct the high-velocity but also to a lesser extent for wing design. It occurs
exhaust gases forward. This decreases the airplane's when the center of lift is ahead of the center of rotation.
landing roll.
aerodynamics - The science of the action of air on an
aerodynamic braking - The generation of aerodynamic object, and with the motion of air on other gases.
drag used to reduce the roll after landing or to allow the Aerodynamics deals with the production of lift by the
aircraft to descend at a steep angle without building up aircraft, the relative wind, and the atmosphere.
excessive airspeed. Examples would include speed
Aerofiche - Registered trade name for a form of
brakes and spoilers to steepen glide paths and reduce
microfiche used in the aircraft industry. Two hundred
landing roll. The reverse pitch on propellers and
eighty-eight Games of information may be placed on a
reverse thrust on turbine engines are also used in
reducing landing roll.
single 4" x 8" card of film.
aeronaut - A person who operates or travels in airships
aerodynamic center - The point within the airfoil
or balloons.
section located at a point approximately one-fourth of
the way back from the leading edge. It is the point at aeronautical beacon - A visual NAVAID displaying
which the (pitching) moment coefficient is relatively flashes of white andlor colored light to indicate the
constant for all angles of attack.
location of an airport, a heliport, a landmark, a certain
point of a Federal airway in mountainous terrain, or an
aerodynamic center of horizontal tail - The point at
which the flow of air over the horizontal stabilizer
obstruction.
creates a force which pushes the tail up or down.
aeronautical chart - A map used in air navigation
containing all or part of the following: topographic
aerodynamic coefficients - Non-dimensional
features, hazards and obstructions, navigation aids,
coefficients for aerodynamic forces and moments.
navigation routes, designated airspace, and airports.
aerodynamic contrail - As an aircraft moves through Common aeronautical charts include:
moist air the forces created by dynamic flow over the
lifting surfaces cause the surrounding atmosphere to
reach saturation, to form a cloud like trail. Usually this
is generated by high-performance aircraft.
a. Sectional Aeronautical Charts (1:500,000) -
Designed for visual navigation of slow or medium
speed aircraft. Topographic information on these charts
features the portrayal of relief, and a judicious selection
aerodynamic design point - In turbine engines, the
most efficient compression ratio that occurs at altitude.
aerodynamic drag - Drag caused by turbulent airflow
on an airfoil such as a wing, propeller, or compressor
blade.
aerodynamic factors - 1. Those factors that affect the
amount of lift or drag produced by an airfoil. 2. The
forces acting on a propeller while rotating through the
air as it transforms the rotary power of the engine into
thrust.
of visual check points for VFR flight. Aeronautical
information includes visual and radio aids to
navigation, airports, controlled airspace, restricted
areas, obstructions and related data.
b. VFR Terminal Area Charts (1:250,000)- Depict
Class B airspace which provides for the control or
segregation of all the aircraft within the Class B
airspace. The chart depicts topographic information
and aeronautical information which includes visual and
radio aids to navigation, airports, controlled airspace,
restricted areas, obstructions, and related data.
c. Jeppesen Class B Airspace Charts - Provide
aerodynamic heating - The temperature rise caused by aeronautical informatiori for orientation purposes by
high-speed air flowing over an aerodynamic surface. depicting airways and navaids used to assist in
determining the aircraft's position relative to the
aerodynamic lift - The upward force caused by highvertical
and lateral limits of the Class B airspace. Also
speed air flowing over an airfoil.
include flight procedures and VFR approach control
aerodynamic shape - The shape of an object with frequencies for each Class B airspace. Charts are
reference to the airflow over it. Certain shapes cause identified by the principal city and state using an index
air pressure differentials which produce lift; others are number of 10-1A.
designed for minimum airflow resistance. d. World Aeronautical Charts (WAC) (1 :1,000,000)
- Provide a standard series of aeronautical charts
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