poppet valve /p.p.t vlv/ noun an
intake or exhaust valve of a piston
engine, operated by springs and cams porous /p.r.s/ adjective referring to substances which allow fluid to pass through them . The de-icing fluid passes through a porous plastic sheet.
port /p.t/ noun 1. an entrance which is opened periodically . inlet port . As a piston in the pump moves outwards into its cylinder, it covers the inlet port and forces fluid out of the top of the cyl-inder. 2. the left-hand side of an aircraft when facing forwards when inside the aircraft . Unless an aircraft is flying in the same or exactly opposite direction to the wind, it will experience either port or starboard drift. Opposite star-board
portable /p.t.b(.)l/ adjective capa-
ble of being carried in the hands . a portable fire extinguisher . The aneroid barometer is a more portable device than a mercury barometer.
portable electronic device
/p.t.b(.)l .lektr.n.k d.va.s/ noun
a piece of electronic equipment such as a mobile phone or laptop which is small enough to be carried onboard an air-craft, and which may cause problems with the aircraft’s systems during flight. Abbreviation PED
portion /p..(.)n/ noun a part or sec-tion . A hailstone starts as a small ice particle in the upper portion of a cumu-lus cloud.
position /p.z..(.)n/ noun 1. a place or location where something is . The Greenwich or prime meridian and the equator are the axes of the system called latitude and longitude which is used for expressing position on the Earth. 2. the setting of a control, etc. . the neutral position 3. . in a sitting position seated . verb to place some-thing in a special location . The mag-netic compass is positioned away from magnetic sources.
position line /p.z..(.)n la.n/ noun
a line along which an aircraft is known to be at a particular time, usually by tak-ing a VOR bearing. Also called line of position, navigational line
position report /p.z..(.)n r.p.t/
noun a report over a known location as transmitted by an aircraft to an air traf-fic control station
positive /p.z.t.v/ adjective 1. defi-
nite, without doubt . The pinpoint is a very positive means of establishing air-craft 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 ter-minal the terminal of a battery marked +
positive idling speed /p.z.t.v a.d(.)l.. 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 /p.s.b.l.ti/ noun a
chance occurrence . Anti-braking sys-tems are designed to prevent the wheels from locking during landing thus reduc-ing the possibility of wheel skid.
possible /p.s.b(.)l/ adjective capa-ble 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.
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