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small piece or part
Solid particles in
the atmosphere include sand, dust, volcanic
ash and atmospheric pollution.

Hailstones start as ice particles in the
upper part of a cumulonimbus cloud.
particular particular /pə|tkjυlə/ adjective special,
given, distinct, not general
a particular
time
a particular speed
The
size and number of valves required for a
particular type of aircraft is governed
by the amount of air necessary for pressurisation
and air conditioning.
pass pass /pɑs/ noun 1. a badge or document
which allows one to enter a
restricted or prohibited area
a security
pass 2. a successful result in an exam 
verb 1. to move
Tropical storms dissipate
as they pass from sea to land.
The
air leaves the compressor outlet and
passes through a matrix assembly. 2. 
to pass information to give information
 pass your message an instruction
to a pilot to give information via radio
to an air traffic control facility 3.  to
pass an exam to be successful in an
exam 4.  to pass a book to someone to
pick up and give a book to somebody
nearby 5.  to pass another aircraft to
move past another aircraft
passage passage /psd"/ noun 1. movement
over, along, or through something

The passage of air over a turbine is
used to power a small emergency generator.

The passage of a trough is
marked by a sharp veer in the wind. 2. a
channel through which something can
pass
Liquid cooling is achieved by circulating
a liquid around the cylinder
barrels, through a passage formed by a
jacket on the outside. 3. part of a book
or speech, etc.
a passage from a training
manual
passenger passenger /psnd"ə/ noun a person
who travels in an aircraft, car, train,
etc., and has no part in the operation of
it
The Piper Archer has seating for a
pilot and three passengers.
aircraft passenger aircraft /psnd"ə
eəkrɑft/ noun an aircraft specially
designed for carrying people
passive passive /psv/ adjective receiving
an action but taking no action
In primary
radar systems, the target is passive.
 passive state referring to a system
or device which may be switched
on or ‘live’ but not reacting to any input.
Opposite active
mark pass-mark /pɑs mɑk/ noun the
mark which separates those who fail
and those who pass an examination
passport control passport control /pɑspɔt kən|
trəυl/ noun 1. the action of checking
passports of people arriving in or leaving
a country
We now have to go
through passport control. 2. the place
where passports are checked when people
arrive in or leave a country
At
169 period
passport control, a customs official
checks passports.
patch patch /ptʃ/ noun a small area
a
patch of fog
a patch of cloud
Patches
of early morning fog made identification
of ground features difficult.
path path /pɑθ/ noun a route or course
along which something moves
Projection
of the path of the aircraft over
the ground is called its track.
pattern pattern /pt(ə)n/ noun a form or
method which shows particular, consistent
characteristics  pressure pattern
changes in pressure areas which
take place regularly, e.g. every year
pavement pavement /pevmənt/ noun a prepared
concrete or tarmac surface for
ground manoeuvring of aircraft, including
taxiways and runways (NOTE: The
bearing strengths of pavements
intended for aircraft of 5,700 kg MTWA
(maximum total weight authorised) or
less are reported as the maximum
allowable weight and maximum allowable
tyre pressure.)
pavement classification number pavement classification
number /pevmənt klsf|
keʃ(ə)n nmbə/ noun a number
expressing the bearing strength of a
pavement for unrestricted operations.
Abbreviation PCN
PAX PAX abbreviation passengers
payload payload /peləυd/ noun the moneyearning
load carried by the aircraft
including the passengers, baggage and
freight
The shape of an aircraft is
determined by the requirement to provide
an aerodynamic lift force great
enough to support the weight of the aircraft
and payload whilst in flight.
PCN PCN abbreviation pavement classification
number
PDC PDC abbreviation pre-departure clearance
peak peak /pik/ noun the highest point

　
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