the Aviation Dictionary

outside caliper overseas air transportation
outside caliper - A measuring device having two
movable legs. Used to determine the distance across an
object. Once the distance has been established, the
actual dimension can be made using a steel scale or a
vernier caliper.
outside skin - The outer surface of an aircraft.
over - My transmission is ended; I expect a response.
overall efficiency - In turbine engines, the product of
multiplying propulsive efficiency and thermal
efficiency.
overbalance - The adding of counterbalancing weight
to the extent that the trailing edge of a control surface
is above the horizontal position when performing a
static balance test. In a balanced condition, the control
surface would rest in the neutral position.
overboost - A condition in which the manifold pressure
of a reciprocating engine has exceeded the maximum
specified by the manufacturer. Can cause damage to
internal engine components.
overcompounded motor - A compound-wound motor
with more series windings than parallel windings.
Tends to try to speed up under increased loads.
overcontrol - Any movement of a control device in
excess of that needed for a given condition.
overcurrent protection device - An electronic device
that protects a circuit against abnormally high currents.
overhang - In meteorology, the anvil of a thunderstorm,
under which hail can occur and a turbulent wake can
create severe turbulence.
overhaul - To restore an aircraft, engine, or component
to a condition of airworthiness.
overhead cam - The cam of an aircraft reciprocating
engine located above the cylinder head. The overhead
cam operates the valves directly without the aid of
pushrods.
overhead maneuver - A series of predetermined
maneuvers prescribed for aircraft (often in formation)
for entry into the visual flight rules (VFR) traffic
pattern and to proceed to a landing. An overhead
maneuver is not an instrument flight rules (IFR)
approach procedure. An aircraft executing an overhead
ikeuveris considered VFR and the IFR flight plan is
cancelled when the aircraft reaches the "initial point"
on the initial approach portion of the maneuver. The
pattern usually specifies the following:
a. The radio contact required of the pilot.
b. The speed to be maintained.
c. An initial approach 3 to 5 miles in length.
d. An elliptical pattern consisting of two 180 degree
turns.
e. A break point at which the first 180 degree turn is
started.
f. The direction of turns.
g. Altitude (at least 500 feet above the conventional
pattern).
h. A "Roll-out'' on final approach not less than 114
mile from the landing threshold and not less than 300
feet above the ground.
overhead question - In the guided discussion method, a
question directed to the entire group to stimulate
thought and discussion. An overhead question can be
used by an instructor as the lead-off question.
overhead valve - A valve located in the upper part of an
aircraft reciprocating engine cylinder head.
overheat warning system - A system that warns of an
overheat condition that could lead to a fire.
overinflation valve -A relief valve that opens to relieve
excessive air pressure. Used in some of the larger
aircraft wheels that mount tubeless tires.
overlapping - To lap over or extend beyond.
overload - To apply a load in excess of that for which a
device or structure is designed.
overlying center - The ARTCC facility that is
responsible for arrivavdeparture operations at a
specific terminal.
overrunning - In meteorology, when a warm, moist,
stable airmass moves over a warm front or a stationary
front.
overrunning clutch - Generally, a pawl and ratchet
arrangement used on various types of starters. It
permits the starter to drive the engine but not allow the
engine to drive the starter. The ratchet on the engine
side will slip around within the pawls if normal
disengagement does not occur.
overseas air commerce - The carriage by aircraft of
persons or property for compensation or hire, or the
carriage of mail by aircraft, or the operation or
navigation of aircraft in the conduct or furtherance of a
business or vocation, in commerce between a place in
any State of the United States, or the District of
Columbia, and any place in a territory or possession of
the United States; or between a place in a territory or
possession of the United States, and a place in any
other territory or possession of the United States.
overseas air transportation - The carriage by aircraft
of persons or property as a common carrier for
compensation or hire, or the carriage of mail by
aircraft, in commerce:
a. Between a place in a State or the District of
Columbia and a place in a possession of the United
States; or
b. Between a place in a possession of the United
States and a place in another possession of the United
States; whether that commerce moves wholly by
Aircraft Technical Book Company
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