the Aviation Dictionary

P . parallel MLS approaches
P
P factor - A tendency for an aircraft to yaw to the left
due to the descending propeller blade on the right
producing more thrust than the ascending blade on the
left. This occurs when the aircraft's longitudinal axis is
in a climbing attitude in relation to the relative wind.
The P factor would be to the right if the aircraft had a
counter-clockwise rotating propeller.
P time - Proposed Departure Time. The time a
scheduled flight will depart the gate (scheduled
operators) or the actual runway off time for
pan-pan-pan - The international radio-telephony
urgency signal. When repeated three times, indicates
uncertainty or alert followed by the nature of the
urgency.
pants - Streamlined airplane wheel covers.
paper electrical capacitor - An electrical component
that uses two strips of metal foil for its plates and strips
of waxed paper as its dielectric.
parabola - A plane curve equally
distant from a fixed point and a
fixed line.
nonscheduled operators. For EDCT purposes, the parabolic light reflector - A light
:I:<:%
ATCSCC adjusts the "P" time for scheduled operators
to reflect the runway off times.
reflector, such as a light bulb, with
a curved or parabolic surface.
II
v, ----'Xs
W
pack carburizing - A heat treatment method for parabolic microphone A
-
case-hardening steel parts in which the parts are packed sensitive, highly directional B
in the carburizing compound, placed into a drum, and microphone mounted at the focal
heated to a temperature of about 1500" F.
point of a parabolic dish capable of picking up sound
from long distances.
package - A complete assembly unit.
parachute - A large cloth device shaped like an
packing - The hydraulic seal that prevents fluids from umbrella used to retard the fall of a body or object
leaking between two surfaces that move in relation to through the air.
each other.
parachute - A device used or intended to be used to
packing ring - An O-ring used to confine liquids or retard the fall of a body or object through the air.
gases, preventing their passing between a fixed body
and a movable shaft.
par-al-ketone - A heavy, waxy grease used to protect
control cables and hardware fittings from corrosion on
paint - An aircraft finish that consists of pigments seaplanes.
suspended in a solvent-type vehicle. The paint protects
and improves the appearance of the aircraft.
parallax - The apparent change in relationship of two
objects when viewed from different locations not in
paint drier - Any substance added to paint to improve line with the objects.
its drying properties.
parallax - Apparent displacement of an object if first
paint stripper - A chemical material that softens the viewed from one position and then from another.
paint film and loosens its bond to the metal, thus
enabling the paint to be easily wiped or washed away. parallel - 1. Lines that run in the same direction and
will never meet or cross because the distance between
pal nut - A thin, pressed-steel check nut screwed down them is constant. 2. Having more than one path for
over an ordinary nut to prevent it from coming loose or electron flow between the two sides of the electron
backing off.
source.
palladium A with a of Pd parallel access - In computers, a term used to describe a
and an atomic number of 46.
method of accessing data simultaneously, or all data at
pan -A hollow depression or shallow metal object used the same time.
to hold oil.
parallel circuits - Two or more complete circuits
pancake landing - An aircraft landing procedure in connected to the same two power terminals.
which the aircraft is on an even plane with the runway. parallel ILS approaches - Approaches to parallel
As the aircraft reduces speed and lift, it drops to the runways by IFR aircraft that, when established inbound
ground in a flat or prone attitude.
toward the airport on the adjacent final approach
panel - Any separate or distinct portion of an aircraft courses, are radar separated by at least 2 miles.
surface.
parallel lines - Two or more lines extending in the same
pan-head screw - A machine screw or sheet metal direction and at the same distance apart at all points.
screw that has a large, slightly domed head. parallel MLS approaches - See parallel ILS
approaches.
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