the Aviation Dictionary

arrival delay - A parameter which specifies a period of
time in which no aircraft will be metered for arrival at
the specified airport.
arrival routes (ICAO) - Routes on an instrument
approach procedure by which aircraft may proceed
from the enroute phase of flight to the initial approach
fix.
arrival delay . assembly line
with a visual reference when the natural horizon is not
visible.
artificial radio antenna - A device attached to the
output of a radio transmitter when adjusting the
transmitter. The artificial antenna has the same
impedance as the antenna, but the radio signal put into
the artificial antenna is not radiated.
arrival sector - An operational control sector asbestos - A fiber of magnesium silicate that has a high
containing one or more meter fixes.
resistance to fire. It has good insulating qualities.
arrival sector advisory list - An ordered list of data on A-scan - A display on which the indications appear
arrivals displayed at the PVDiMDM of the sector similar to the capital letter "A" along a horizontal time
which controls the meter fix.
line. Found in the displays of ultrasonic test equipment
arrival sequencing program - The automated program
and sometimes radar.
designed to assist in sequencing aircraft destined for ASCII (American Standard Code for Information
the same airport. Interchange) -A format of data used as a standard to
transmit information between computers. Consists of
arrival stream filter (ASF) - An onloff filter that
128 characters that are each made up of seven binary
allows the conflict notification function to be inhibited
bits. Pronounced "as-kee."
for arrival streams into single - or multiple airports to
prevent nuisance alerts.
ash - The solid residue remaining after a substance has
arrival time - The time an aircraft touches down on
burned.
arrival.
ashless dispersant oil (AD)- A popular mineral oil
used as a lubricant for aircraft reciprocating engines.
arsenic -A chemical element with the symbol of As and
Ashless dispersant oil does not contain any metallic
an atomic number of 33. An extremely small amount of
ash-forming ingredients. It has additives in it that keep
arsenic is alloyed with silicon or germanium to make
the contaminants that form in the oil dispersed
N-type semiconductor material.
throughout the oil so they will not join together and
articulated connecting rod - A link rod that connects clog the oil filters.
the pistons in a radial engine to the master rod. There is
aspect ratio - 1. The ratio of the span of the wing to its
one less articulated rod than there are cylinders in each
chord. The aspect ratio of a tapered wing is found by
row of cylinders in a radial engine since one piston is
dividing the square of the wing span by its area. 2. In
attached to the master rod.
composites, the ratio of length to diameter of a
articulated rod assembly - See articulated connecting reinforcing fiber.
rod.
asphalt - A heavy, brownish-black mineral that is found
articulated rotor - In rotorcraft, a rotor system in which in crude oil. Asphalt is used as a base for some acideach
of the blades is connected to the rotor hub in such resistant paints.
a way that it is free to change its pitch angle, and move
aspheric -In optics, an element such as a lens that is not
up and down and fore and aft in its plane of rotation.
perfectly - spherical.
A
artificial aging - A process of increasing the strength of
aspirator - A device for producing suction or for
a heat-treated aluminum alloy by holding it at an
moving or collecting materials by suction.
elevated temverature after it has been solution heat
treated. Artificial aging is Also referred to as assembly - The fitting together of parts to form a
precipitation heat treatment. See also precipitation heat complete structure or unit.
treatment.
assembly break - A joint in the structure of an aircraft
artificial feel - A force feedback or cushioning effect that is formed when two sub-assemblies are removed
that is used in the automatic flight control systems of fiom their jigs and joined together to form a single unit.
some aircraft. Artificial feel produces an opposition to
assembly drawing - An aircraft drawing that shows a
the movement of the coritrols proportional to the
group of parts laid out in the relationship they will have
aerodynamic load that is acting on the control surfaces.
when they are assembled.
artificial horizon - A flight instrument in which a bar or
a display is held in a constant relationship with the
earth's horizon. An artificial horizon provides the pilot
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assembly line - An arrangement of work stations in an
aircraft factory that allows certain functions to be
performed on the aircraft being manufactured.