the Aviation Dictionary

parallel of latitude - Any of the imaginary lines on the
surface of the Earth parallel to the equator and
representing degrees of latitude on the Earth's surface.
parallel offset route - A parallel track to the left or
right of the designated or established ainvaylroute.
Normally associated with Area Navigation (RNAV)
operations.
parallel operation - In computers, an operation that
moves information simultaneously over several lines as
opposed to serially, which moves information one bit at
a time over a single line. Also used to describe an
operation using more than one processor
simultaneously.
parallel resonant electrical circuit - A circuit made up
of an inductor and a capacitor connected in parallel. If
a circuit is resonant, the inductive reactance and the
capacitive reactance are equal at a particular frequency.
Also referred to as a tank circuit
parallel runways - Two or more runways at the same
airport whose centerlines are parallel. In addition to
runway number, parallel runways are designated as L
(left) and R (right) or, if three parallel runways exist, L
(left), C (center), and R (right).
paralleling - Controlling the output of more than one
generator in order to share a load equally. This
involves matching the voltage outputs, the frequency
(of AC generators) and the phase relationship of the
AC current (of AC generators).
paralleling generators - An operational procedure in
which the output voltages of multi-engine aircraft
electrical system generators are adjusted to share the
electrical load equally. This involves matching the
voltage outputs, the frequency (of AC generators) and
the phase relationship of the AC current (of AC
generators).
paramagnetic material - A material that becomes
magnetic when placed in a strong magnetic field and
retains some level of magnetic property as long as the
strong magnetic field is present. However, when the
strong magnetic field is removed, the material loses its
magnetic properties.
parameter - A quantity or constant whose value varies
with the circumstances of its application.
parasite drag - Drag caused by the friction of the air
flowing over a body. Parasite drag increases as
airspeed increases.
parasite drag - That part of total drag created by the
form or shape of airplane parts.
parasol wing airplane - An airplane having one main
supporting surface mounted above the fuselage on
cabane struts.
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parallel of latitude. parting agent
parcel - A volume of air, small enough to contain
uniform distribution of its meteorological properties,
but large enough to remain relatively self-contained
and respond to all meteorological processes.
Parco lubrizing - Anti-friction coatings that contain
solvent-based suspensions of solid lubricants instead of
a coloring pigment.
Parkerizing - A method of treating metal parts by
immersing them in a solution of phosphoric acid and
manganese dioxide. Used to protect the surface from
rusting. -
Parker-Kalon (PK) screws - Self-tapping sheet metal
screws. PK screws are made of hardened steel. and
have sharp, coarse threads that combine drilling,
tapping and fastening.
parking brake - A mechanical or hydraulic brake
system used to prevent an aircraft from moving from
its parked position.
part number - An identification number assigned to a
particular part or assembly by the manufacturer.
part power trim check - The act of trimming the
engine with the power lever against a trim stop or rig
pin, then checking the EPR or N, speed against a trim
curve for ambient conditions. If the correct values are
not present, adjustment of the fuel control, referred to
as trimming, is required.
partial obscuration - Denotes that 118th or more of the
sky, but not all of the sky, is hidden by surface-based
(excluding precipitation) phenomena in the
atmosphere.
partial panel - Controlling the airplane without the
benefit of all instrumentation due to failure of one or
more instruments in flight. Pilots are required to
demonstrate basic attitude instrument flying on partial
panel and are also required to fly a partial panel
instrument approach during the practical test for the
instrument rating.
partial pressure - The gases that make up the
atmosphere each exert a partial pressure. When all of
the partial pressures are added together, they equal the
total atmospheric pressure.
partial-panel flight - Instrument flight without vacuurnpowered
gyroscopic instruments. Remaining
instruments would be the altimeter, airspeed indicator,
turn coordinator, vertical speed indicator, and magnetic
compass.
particle -A small piece of any substance or matter.
particulates - Very small liquid or solid particles in the
atmosphere. When suspended in the atmosphere, they
are called aerosols.
parting agent - In composites, a lubricant used to
prevent the part from sticking to the mold.