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heavy equipment or tools used for doing
something
plate plate /plet/ noun a smooth, flat rigid
object with the same thickness all over

The basic construction of a lead-acid
cell consists of a positive electrode and
negative electrode, each of which is
made up of lead-antimony alloy grid
plates.
play play /ple/ noun a slightly loose fitting
of engineering parts which allows them
to move freely
Some play should be
felt in the aileron actuator rod linkage.
 verb  to play a part to be part of a
whole which has an effect on something

Contrast and colour play a part in
identifying coastlines.
plot plot /plɒt/ noun a graph or diagram
that shows a relationship between two
sets of numbers as a series of points
joined by a line
a plot of applied stress
and resulting strain  verb to calculate
and mark a line on a graph or chart, etc.
 to plot a course to calculate and draw
the desired route of an aircraft on a
chart
plug plug /pl$/ noun 1. a device for making
an electrical connection
Alternating
current ground power can be fitted
to an aircraft via a six-pin ground
power plug.  a 3-pin plug an electrical
supply plug with three electrodes: live,
neutral and earth 2. a device for igniting
fuel in an engine
An electric spark
from an igniter plug starts combustion.

The fuel/air mixture is ignited by a
spark plug. 3. a device to prevent liquid
flowing out of a container
oil drain
plug
spark plug  verb 1.  to plug a
hole to fill a hole so that fluid cannot
escape 2.  to plug something in to
173 polarity
make an electrical connection, often by
inserting the plug on an electrical
device such as a computer into an electrical
supply socket
plunger plunger /plnd"ə/ noun a machine
part that operates with a thrusting or
plunging movement, e.g. a piston
A
flow indicator valve comprises a body,
a spring-loaded plunger connected to
an actuator arm, and a micro-switch.
plus plus /pls/ preposition increased,
added to
At the selected decision
height plus 50 feet, an aural alert chime
sounds.
Four plus four equals eight (4
+ 4 = 8).
PMS PMS /pi em es/ abbreviation performance
management system
pneumatic pneumatic /nju|mtk/ adjective
operating by means of air under pressure
or compressed air
High-pressure
pneumatic systems are generally fitted
on the older types of piston-engine aircraft
to operate the landing gear, wing
flaps, wheel brakes.
pneumatically pneumatically /nju|mtkli/
adverb by using air under pressure or
compressed air
Clamshell doors are
hydraulically or pneumatically opened.
PNR PNR abbreviation point of no return
POB POB abbreviation persons on board
pocket pocket /pɒkt/ noun same as air
pocket
pod pod /pɒd/ noun a streamlined casing
or housing
The engine bay or pod is
usually cooled by atmospheric air.
POH POH abbreviation Pilot’s Operating
Handbook
point point /pɔnt/ noun 1. a particular figure
on a scale
The melting point of ice
is 0°C (Celsius). 2. a particular place 
a point on a map a particular place on
a map 3. the sharp end of something
a
pencil point  verb 1. to direct towards

Point the aircraft towards the airfield.
2. to indicate direction, often with a finger

point to the east 3.  to point out
to draw attention to
The instructor
pointed out the dangers of not keeping a
good lookout.
pointer pointer /pɔntə/ noun an indicating
device on an instrument, e.g. a needle

The pointer centralises to indicate that
the aircraft is aligned with the runway
centre line.
point of no return point of no return /pɔnt əv nəυ r|
t%n/ noun a place on the route where
the aircraft does not have enough fuel to
return to the starting place
The point
of no return is calculated before departure
to cover the chance that both the
terminal airfield and its alternate
become unavailable during flight.
Abbreviation PNR
polar polar /pəυlə/ adjective 1. located in or
coming from the region around the
north or south pole
polar air
a polar
region
The greatest horizontal gradients
of mean temperatures of a layer are
found at the boundaries between cold
polar and warm tropical air masses. 2.
referring to the pole or poles of an electrical
device or of a magnet
Bar magnets
　
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