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overnight or longer, check the drains for
water. This should, of course, be normal
practice’ [Civil Aviation Authority,
General Aviation Safety Sense Leaflet]
practise practise /prkts/ verb to do something
repeatedly in order to improve

In order to improve flying skills, a
trainee pilot must practise regularly.
(NOTE: This word is also written practice
in US English.)
pre- pre- /pri/ prefix before
pre-arrange pre-arrange /pri ə|ren"/ verb to
decide or to plan in advance, to predetermine

Selective calling uses the
four-letter code pre-arranged with the
controlling authorities.
precaution precaution /pr|kɔʃ(ə)n/ noun an
action taken to prevent or avoid a dangerous
situation or failure
Personnel
concerned with fuelling should take
every precaution to prevent outbreaks
of fire.
precede 176
precede precede /pr|sid/ verb to take place
or to come before something else
A
period of calm often precedes a storm.

When the RVR (runway visual range) is
greater than the maximum value which
can be assessed, the group will be preceded
by the letter indicator P followed
by the highest value which can be
assessed.
precedence precedence /presd(ə)ns/ noun the
quality of being more important or
urgent than something else  to take
precedence over to have priority over,
to be more important than
Emergency
landings take precedence over all others.
preceding preceding /pr|sidŋ/ adjective taking
place or coming before something
else  as mentioned in the preceding
paragraph as written in the paragraph
before the one being read
precipitation /pr|sp|teʃ(ə)n/
noun water falling as rain, drizzle, hail,
sleet and snow from the atmosphere
onto the surface of the Earth
Cloud
droplets are small and light at first, but
when the droplets grow and become
heavier, they fall as precipitation.
Precipitation
is classified as light, moderate
or heavy according to its rate of fall.
precise precise /pr|sas/ adjective exact or
accurate
A pinpoint is an indication of
the precise position of the aircraft.
A
precise interval is essential to obtain
correct ignition timing on all cylinders
during engine running.
precision /pr|s"(ə)n/ noun exactness
or accuracy
Precision flying is
only achieved by constant practice. 
with precision with exactness
precision approach path indicator precision approach path indicator
/pr|s"(ə)n ə|prəυtʃ pɑθ
ndketə/ noun a set of lights that
enables pilots to judge whether their
glide slope is correct on the final
approach to landing
precision approach radar precision approach radar /pr|
s"(ə)n ə|prəυtʃ redɑ/ noun a
ground-based primary radar system to
give vertical and lateral information
about an aircraft’s final approach path.
Abbreviation PAR
precision area navigation precision area navigation /pr|
s"(ə)n eəriə nv|$eʃ(ə)n/ noun a
standard of performance for navigation
that requires an aircraft to remain
within 1 nautical mile of the centreline
of its course for 95% of the time.
Abbreviation PRNAV
pre-departure pre-departure /pri d|pɑtʃə/
adjective taking place before a departure

Only a few passengers absorb the
pre-departure safety information.
pre-departure clearance pre-departure clearance /pri d|
pɑtʃə klərəns/ noun a message that
the pilot must receive from air traffic
control before the plane is allowed to
take off
predetermine predetermine /prid|t%mn/ verb
to decide and set or fix beforehand
predetermined predetermined /prid|t%mnd/
adjective decided and set beforehand

When the roll control knob is returned
to the central position, the aircraft rolls
out on to a predetermined heading.
predict predict /pr|dkt/ verb to foretell or to
say beforehand
Rain is predicted
within the next hour.
Dead reckoning
position is the position of the aircraft as
predicted by calculation.
predictable predictable /pr|dktəb(ə)l/ adjective
1. reliably regular and therefore
　
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