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under fluid pressure, as in petrol and
diesel engines or compresses fluids, as
in pumps and compressors
engine piston engine /pstən end"n/
noun a petrol or diesel engine in which
pistons are moved by combustion of
fuel, this reciprocating movement producing
rotating movement
piston ring piston ring /pstən rŋ/ noun one of
the metal rings which seals the space
between the piston and the cylinder wall

There should be a loose fit between
the cylinder and the piston, the difference
being taken up by the piston rings.
pitch pitch /ptʃ/ noun 1. a nose up/down
movement of the aircraft about its lateral
axis
If the control column is
moved forward or aft, the pitch attitude
of the aircraft changes. 2. the distance a
propeller would advance in one rotation
if there was no slip  fine pitch setting
and coarse pitch setting angular propeller-
blade settings
Variable pitch
propellers were originally produced
with two blade-angle settings – fine
pitch to enable full engine speed to be
used on take off and coarse pitch to
allow an economical engine speed to be
used for cruising.  verb to move about
the lateral axis
Move the yoke fore and
aft to pitch down and up.
pitch angle pitch angle /ptʃ n$(ə)l/ noun the
angle between the blade element chord
line and the plane of rotation of the propeller
lock pitch lock /ptʃ lɒk/ noun a means of
holding the fine pitch stop in a prescribed
position (NOTE: Some manufacturers
use the term to describe a device
which locks the blades at whatever
angle they are at if there is a failure of
the pitch change mechanism.)
trim pitch trim /ptʃ trm/ noun the trim
of the aircraft in the lateral axis so that
pitot head 172
there are no forward/aft forces on the
control stick or yoke
pitot head pitot head /pitəυ hed/ noun an
externally mounted device which
senses and sends airspeed information
to the airspeed indicator in the cockpit
pitot-static system pitot-static system /pitəυ
sttk sstəm/ noun a pressure system
for the airspeed indicator, altimeter
and vertical speed indicator
pitot tube pitot tube /pitəυ tjub/, Pitot tube
noun an open-ended tube used to measure
the speed of flow of a fluid
device
to sense pitot pressure created by the
movement of air over the aircraft
pivot pivot /pvət/ noun a short rod on
which another part rotates  verb to turn
on a point
The rocker arm pivots on a
bearing and opens the valve.
place place /ples/ noun 1. a space or area

Greenwich is a place on the 0° meridian.
2. a position
decimal place 3.  in
place of instead of  to take place to
happen
The explosion took place just
before the aircraft landed.  verb to put

Place the chart on the seat next to you.

Rotate the grid to place the wind
direction under true.
plain plain /plen/ adjective without pattern
or marking or writing  a plain sheet of
paper a sheet of paper with nothing on
it
plan plan /pln/ noun 1. a drawing or diagram
of a place viewed from above

The horizontal situation indicator
presents a selectable dynamic colour
display of flight progress and plan view
orientation. 2. a scheme or programme
worked out in advance of putting something
into operation  verb to organise a
scheme or programme
Jeppesen
charts are used to plan and fly a safe
route to a destination.
plane plane /plen/ noun 1. an imaginary
surface containing all the straight lines
that connect any two points on it
The
planes of parallels of latitude are parallel
to the plane of the equator.
The
pitch angle is the angle between the
blade element chord line and the plane
of rotation of the propeller. 2. an aeroplane
(NOTE: Because of possible confusion
with meaning 1, plane as in
meaning 2 is considered bad usage by
some. The word aircraft is preferred in
that case.)
planning planning /plnŋ/ noun making
plans
The instructor gave a talk on
flight planning.
plan position indicator plan position indicator /pln pə|
zʃ(ə)n ndketə/ noun the normal
type of display for a radar signal, which
resembles a map with the radar site at
the centre
plant plant /plɑnt/ noun large and usually
　
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