(NOTE: presetting – preset) . adjective
set in advance press /pres/ verb to push or exert pres-sure on . press to test/talk (PTT) button
. Press the button.
pressure /pre../ 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 ele-ment. . absolute pressure
pressure altimeter /pre.. lt. mit./ noun a conventional altimeter which operates using atmospheric pres-sure
pressure altitude /pre.. ltitjud/ noun the altitude indicated when the altimeter is set to 1013.2 mil-libars . 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 /pre.. blkhed/ noun a partition inside the aircraft which separates pressurised from non-pressurised areas
pressure gauge /pre.. e.d/
noun an instrument for measuring pres-sure
pressure relay /pre.. 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 /pre..ra.
ze..(.)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 /pre..ra.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 /pr.ve.l/ verb to be most com-mon or frequent . Hot dry conditions prevail in the Middle East in summer-time. . the prevailing wind is from the south-west the wind blows from the south west more often than from any other direction
prevent /pr.vent/ verb to stop from happening . Heated air provides suffi-cient heat in the outer skin to melt ice already formed and prevent any further ice formation.
previous /privi.s/ adjective coming
before, earlier . the previous chapter the chapter before the one being read or referred to . previous reports earlier reports
primarily /pra.mer(.)li/ adverb most often, mainly . Dry chemical fire extin-guishers are primarily used for electri-cal fires.
primary /pra.m.ri/ adjective first or most important . of primary impor-tance of greatest importance . primary coil an induction coil
primary flight display noun same as primary flight instruments primary flight instruments
/pra.m.ri fla.t .nstrυm.nts/ plural noun the six instruments displayed on the instrument panel immediately in front of the pilot: airspeed indicator, attitude indicator, altimeter, turn coor-
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