ABOARDIn or on a ship, aircraft, or other means of
ABORTTo cut short or break off an action,
operation, or procedure with an aircraft, guided
equipment failure; for example, to abort a mission.
ACCELERATIONA change in the velocity of a
body, or the rate of such change with respect to
speed or direction.
ACCESSORYA part, subassembly, or assembly
designed for use in conjunction with or to
supplement another assembly or unit.
example, the fuel control is an accessory for a
AERODYNAMICSThe science that deals with the
motion of air and other gaseous fluids and the
forces acting on bodies in motion relative to such
AFFFAn aqueous film-forming foam; also known as
AFTTowards the rear of the ship, aircraft, or other
AILERONA movable control surface or device.
One of pair located in or attached to the wings on
both sides of an aircraft. The primary purpose is to
control the aircraft laterally or in a roll by creating
unequal or opposing lifting forces on opposite sides
of the aircraft.
AIMDAvaition Intermediate Maintenance Depart-
AIRFOILA structure or body, such as an aircraft
wing or propeller blade, designed to provide
AIRSPEEDThe speed of an aircraft, missile, rocket,
or the like, relative to the air through which it flies.
ALTIMETERAn instrument for measuring altitude.
It uses the change in atmospheric pressure with
altitude to indicate the approximate elevation
above a given point.
AMBIENTSurrounding; adjacent to; next to. For
example, ambient conditions are physical condi-
tions of the immediate area such as ambient tem-
perature, ambient humidity, ambient pressure, etc.
ANGLE OF ATTACKThe angle at which a body,
such as an airfoil or fuselage, meets a flow or air.
ANTI-ICINGThe prevention of ice formation upon
an aircraft's surface or engines.
APRONAn area, ordinarily paved, for parking or
ASCENDTo move or rise upward.
ATMOSPHEREThe body of air surrounding the
earth. The atmospheric pressure at sea level is 14.7
ATTITUDEThe position or orientation of an
aircraft, either in motion or at rest, as determined
by the relationship between its axes and some
reference line or plane or some fixed system of
AUTOMATIC PILOTA device or system that
automatically controls the flight of an aircraft or
AVGASAviation gasoline for reciprocating engines.
AVIONICSElectronics as applied to aviation.
AXISAn imaginary line that passes through a body,
about which the body rotates or may be assumed to
rotate. For example, the horizontal axis, the lateral
axis, and the longitudinal axis about which an
BERNOULLI'S PRINCIPLEIf a fluid flowing
through a tube reaches a constriction, or narrowing
of the tube, the velocity of fluid flowing through the
construction increases and the pressure decreases.
CANTED DECKThe area of an aircraft carrier
flight deck that is at an angle to the center line of the
ship. The canted deck permits aircraft to be parked
out of the way of landing aircraft.