Dictionary of Aviation下(39)

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control station
positive positive /pɒztv/ adjective 1. definite,
without doubt
The pinpoint is a
very positive means of establishing aircraft
position. 2. referring to a number
greater than zero
Oil is ducted to the
front of the pitch change piston and the
blades move to a positive angle. 3.
referring to the + symbol  positive terminal
the terminal of a battery marked
+
positive idling speed positive idling speed /pɒztv
ad(ə)lŋ spid/ noun idling speed
selected with the throttle to ensure that
the engine runs correctly without spark
plug fouling
An adjustable stop on the
throttle control ensures a positive idling
speed.
possibility possibility /pɒs|blti/ noun a
chance occurrence
Anti-braking systems
are designed to prevent the wheels
from locking during landing thus reducing
the possibility of wheel skid.
possible possible /pɒsb(ə)l/ adjective capable
of happening
If possible, control
surfaces should be moved by hand.

There will be a possible delay.
Fire in
a toilet could present difficulties due to
the confined space and possible smoke
accumulation.
175 precaution
potential potential /pə|tenʃəl/ adjective capable
of being, but not yet in existence
A
designated fire zone is a region where a
potential fire risk may exist.  potential
danger possible future danger  noun
voltage
Precipitation static develops
due to friction between the aircraft surface
and precipitation causing the aircraft
to become charged to a high
potential.
pound pound /paυnd/ noun a unit of weight
equal to 16 ounces or 453.592 grams.
Abbreviation lb
powder powder /paυdə/ noun a substance
made of ground or otherwise finely dispersed
solid particles
Dry chemical
fire-extinguishers contain a non-toxic
powder.
power power /paυə/ noun energy or force
power-assisted power-assisted /paυə ə|sstd/
adjective  power-assisted controls
controls which require less human
effort to move
power dive power dive /paυə dav/ noun a steep
dive made by an aircraft with its engines
at high power to increase the speed
powered powered /paυəd/ adjective driven by
something such as a type of energy or
motor
system powered by electricity
power line power line /paυə lan/ noun a thick
cable, supported by pylons, which carries
electricity for long distances
powerplant powerplant /paυəplɑnt/ noun an
engine used to move a vehicle or aircraft

Additional strength is required
for the powerplant attachment point.
(NOTE: The word also written power
plant.)
‘…by replacing the Rotax engine with a
four-stroke Jabiru powerplant, the aircraft
designers claim the aircraft will be
provided with more power and increased
all-round performance’ [Flight
International 16–22 July 1997]
power supply power supply /paυə sə|pla/ noun
an electrical circuit that provides particular
direct current voltage and current
levels from an alternating current
source for use in other electrical circuits

If the power supply from the amplifier
to the gauge fails, the needle slowly
falls to zero.
PPI PPI abbreviation plan position indicator
PPL PPL abbreviation Private Pilot’s
Licence
PPR PPR abbreviation prior permission
required
PRPR abbreviation public relations
practicable practicable /prktkəb(ə)l/ adjective
capable of being put into practice or
effect
Some military aircraft use braking
parachutes but this is not practicable
on civil aircraft.
practical practical /prktk(ə)l/ adjective
referring to practice or action rather
than theory
For practical purposes,
any straight line drawn on a Lambert’s
conformal projection represents a great
circle.
practice practice /prkts/ noun 1. habitual
or customary behaviour
It is common
practice for pilots to take turns to sleep
on long-haul flights. 2. a performance
or operation  in practice when actually
done, in reality
Frequency modulation
(FM) in theory has a limitless
number of sidebands, but in practice
only the first eight pairs are significant.
 verb US same as practise
‘…if the aircraft has been standing
　
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