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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 /pra.m.ri re.dɑ/
noun a radar system which uses
reflected radio signals 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 /pra.m nmb./
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 /pra.m./ noun 1. a protective substance which is applied to a metal or wood surface before painting . Interior metal finishing is done with dust shed-ding 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 /pr.ns.p(.)l/ adjective
main . Four principal control modes can be selected on the EFIS (electronic flight instrument system) control panel.
principle /pr.ns.p(.)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 /pra../ adjective earlier, previ-ous . prior approval . prior permission . prior to before . prior to our depar-ture . prior to take-off before take-off
‘…the pilot remembered hearing the stall warning immediately prior to impact’ [Pilot]
priority /pra..r.ti/ noun the order of importance or urgency . high priority important or urgent in the circum-stances . low priority not important or urgent in the circumstances
Private Pilot’s Licence /pra.v.t pa.l.ts la.s(.)ns/ noun the basic
licence for flying light aircraft. Abbre-
viation PPL PRNAV abbreviation precision area navigation
probability /pr.b.b.l.ti/ noun like-lihood, the chance of occurrence . The probability of aquaplaning increases as the depth of tyre tread decreases.
probable /pr.b.b(.)l/ adjective
likely, most possible . Pilot error was the probable cause of the accident.
probe /pr.υb/ noun a metal sensing device . Ice is allowed to accumulate on a probe which projects into the air-stream.
procedural /pr.sid.r.l/ adjective
referring to procedure
procedural approach /pr.sid.r.l .pr.υt./ 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 con-duct procedural approaches is high.
procedure /pr.sid./ noun 1. a
series of actions taken to achieve some-thing . an emergency procedure 2. the process by which aircraft are brought into position for an instrument approach and landing