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selected or chosen in advance
The
CSU (constant speed unit) maintains
the pre-selected propeller speed.
presence presence /prez(ə)ns/ noun existence

The presence of cloud by day
decreases the value of the maximum
temperatures.
A fuel sample hazy or
cloudy in appearance would indicate
the presence of water.
present present /prez(ə)nt/ adjective 1. in
place, existing
Fuel, oxygen and heat
must all be present for fire to exist. 2.
the period in time through which we are
now living, between the past and the
future  at the present time at this
time, now  present day aircraft modern
aircraft  present weather the
weather at the moment of speaking 
verb /pr|zent/ 1. to create or to make

A fire in a toilet could present difficul-
presentation 178
ties.
Learning to fly presents a challenge.
 to present an opportunity to
create or to give an opportunity 2. to
give a prize or award
Charter passengers
on Concorde were presented with a
certificate as a souvenir of their flight.
presentation presentation /prez(ə)n|teʃ(ə)n/
noun showing, a display
The most
widely acceptable presentation of flight
fuel data is in a tabular form.
presently presently /prez(ə)ntli/ adverb 1.
soon
I’ll be there presently. 2. US
now, at the present time  he’s presently
in France at the present time, he
is in France  a number of methods
are presently in use a number of methods
are currently in use
preset preset /pri|set/ verb to set in
advance
Radios allow the user to preset
a number of different frequencies.
(NOTE: presetting – preset)  adjective
set in advance
press press /pres/ verb to push or exert pressure
on
press to test/talk (PTT) button

Press the button.
pressure pressure /preʃə/ noun force applied
uniformly over a surface, measured as
force per unit of area  fuel pressure
pressure exerted by fuel as it is pumped
from the tanks to the engine  pressure
switch a switch which is activated when
a preset pressure is attained
On some
engines a fuel differential pressure
switch fitted to the fuel filter senses the
pressure difference across the filter element.

absolute pressure
pressure altimeter pressure altimeter /preʃə lt|
mitə/ noun a conventional altimeter
which operates using atmospheric pressure
pressure altitude pressure altitude /preʃə
ltitjud/ noun the altitude indicated
when the altimeter is set to 1013.2 millibars

When using flight levels, the
altimeter should be set to 1013.2 mb to
give the pressure altitude.
COMMENT: Pressure altitude is used in
determining density altitude, true
altitude and true airspeed.
pressure bulkhead pressure bulkhead /preʃə
blkhed/ noun a partition inside the
aircraft which separates pressurised
from non-pressurised areas
pressure gauge pressure gauge /preʃə $ed"/
noun an instrument for measuring pressure
pressure relay pressure relay /preʃə rile/ noun
a component which transmits fluid
pressure to a direct reading pressure
gauge, or to a pressure transmitter
which electrically indicates pressure on
an instrument on the hydraulic panel
pressurisation pressurisation /preʃəra|
zeʃ(ə)n/, pressurization noun the act
of increasing the air pressure inside a
space, e.g. an aircraft cabin, so that it
feels normal for the occupants when the
outside air pressure decreases
pressurise pressurise /preʃəraz/, pressurize
verb to increase the pressure of
When
air pressure is used to transfer fuel, it
will be necessary to pressurise the fuel
tanks.
prevail prevail /pr|vel/ verb to be most common
or frequent
Hot dry conditions
prevail in the Middle East in summertime.
 the prevailing wind is from the
south-west the wind blows from the
south west more often than from any
other direction
prevent prevent /pr|vent/ verb to stop from
happening
Heated air provides sufficient
heat in the outer skin to melt ice
already formed and prevent any further
ice formation.
previous previous /priviəs/ adjective coming
before, earlier  the previous chapter
the chapter before the one being read or
referred to  previous reports earlier
reports
primarily primarily /pra|mer(ə)li/ adverb most
　
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本文鏈接地址：Dictionary of Aviation下(42)