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often, mainly
Dry chemical fire extinguishers
are primarily used for electrical
fires.
primary primary /praməri/ adjective first or
most important  of primary importance
of greatest importance  primary
coil an induction coil
primary flight display primary flight display noun same
as primary flight instruments
primary flight instruments primary flight instruments
/praməri flat nstrυmənts/ plural
noun the six instruments displayed on
the instrument panel immediately in
front of the pilot: airspeed indicator,
attitude indicator, altimeter, turn coor-
179 product
dinator, heading indicator, and vertical
speed indicator
When practising
instrument flying, the attitude indicator
is the most important of the primary
flight instruments.
primary radar primary radar /praməri redɑ/
noun a radar system which uses
reflected radio signals
prime prime /pram/ adjective first  prime
importance greatest importance  verb
to pump fuel spray into the piston
engine inlet manifold to make starting
from cold easier
During the summer,
after the first flight of the day, it is not
normally necessary to prime the engine.
prime number prime number /pram nmbə/
noun a number, which, if there is to be
no remainder, is only divisible by itself
and 1, e.g. 13, 17, 19, 23, 29
primer primer /pramə/ noun 1. a protective
substance which is applied to a metal or
wood surface before painting
Interior
metal finishing is done with dust shedding
gloss-paint over a primer. 2. a
small hand-operated pump, operated
from the cockpit, to spray fuel into the
piston engine inlet manifold to make
starting from cold easier
principal principal /prnsp(ə)l/ adjective
main
Four principal control modes
can be selected on the EFIS (electronic
flight instrument system) control panel.
principle principle /prnsp(ə)l/ noun a basic
truth or law
Fire extinguishing is
based on the principle of removing one
of the three components necessary for
fire to exist – fuel, oxygen and heat.
(NOTE: Do not confuse with principal.)
prior prior /praə/ adjective earlier, previous

prior approval
prior permission
 prior to before
prior to our departure
 prior to take-off before take-off
‘…the pilot remembered hearing the stall
warning immediately prior to impact’
[Pilot]
priority priority /pra|ɒrti/ noun the order of
importance or urgency  high priority
important or urgent in the circumstances
 low priority not important or
urgent in the circumstances
Private Pilot’s Licence Private Pilot’s Licence /pravət
paləts las(ə)ns/ noun the basic
licence for flying light aircraft. Abbreviation
PPL
PRNAV PRNAV abbreviation precision area
navigation
probability probability /prɒbə|blti/ noun likelihood,
the chance of occurrence
The
probability of aquaplaning increases as
the depth of tyre tread decreases.
probable probable /prɒbəb(ə)l/ adjective
likely, most possible
Pilot error was
the probable cause of the accident.
probe probe /prəυb/ noun a metal sensing
device
Ice is allowed to accumulate
on a probe which projects into the airstream.
procedural procedural /prə|sid"ərəl/ adjective
referring to procedure
procedural approach procedural approach /prə|
sid"ərəl ə|prəυtʃ/ noun a specific
approach made often after procedure
turns as part of timed, accurately flown
flight pattern to prepare for a landing at
a particular aerodrome
It is important
that the integrity of an aid used to conduct
procedural approaches is high.
procedure procedure /prə|sid"ə/ noun 1. a
series of actions taken to achieve something

an emergency procedure 2. the
process by which aircraft are brought
into position for an instrument approach
and landing
procedure turn procedure turn /prə|sid"ə t%n/
noun a turn made at 3° per second to
align the aircraft with the runway
process process /prəυses/ noun a series of
actions or changes which achieve a particular
result
adiabatic process
combustion
process
cooling process
produce produce /prə|djus/ verb 1. to create
　
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本文鏈接地址：Dictionary of Aviation下(43)