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pop-up alert
identified and attacked; eliminated by BFPA (blind firstpass
attack).
pop-up alert Unmissable warning caption [e.g., terrain
proximity] on a cockpit display.
pop-up delivery In delivery of NW, was usually from 500
to 1,000 ft altitude at maximum rate (RAF) See * point.
pop-up missile 1 One ejected, often by gas
generator/piston or other device not forming part of
missile propulsion, from launch system in vertical direction,
subsequently making fast pitch-over on target
heading. Launcher need not move in azimuth or
elevation, thus minimizing reaction time.
2 Missile making pop-up manoeuvre as it nears
previously located target on which it then dives.
pop-up point Ground position at which PU delivery is
initiated, 25,000 ft [103 s] before overflying target.
pop-up test Test of pop-up missile (1) launch system.
POR 1 Pilot opinion rating.
2 Pacific Oceanic Region.
PORM, Porm Plus or minus.
Poroly Porous metal produced by incomplete sintering,
mainly used as filter.
porous friction asphalt Asphalt whose constituents and
lay-down process are tailored to give high-µ surface which
will not permit standing water to remain. Preferred top
layer to runway.
porpoise 1 Undulatory (near-phugoid) motion of
marine aircraft and some landplanes with bicycle landing
gear characterized by pitch oscillation and limitedamplitude
vertical travel; normally problem only at
particular speed(s).
2 In absence of radio contact, deliberate roller-coaster
flight to indicate to pilot of friendly interceptor (more
rarely, tower) that aircraft is in distress.
port 1 Left side or direction, aircraft viewed from rear.
2 Aperture in solid rocket motor case opened for thrust
termination.
3 Aperture[s] in volume under pressure regularly
opened and closed by valves, such as in piston engine or
reciprocating-compressor cylinder.
portable data store Computerized flight-planning data
carried by member of flight crew and plugged in before
take-off.
portal 1 Air/land interface: airfield or heliport.
2 Airline website.
port drift From pilot’s viewpoint, wind from the right.
Porteous loop Loop with 360° aileron roll added at
zenith.
portfolio Owner’s catalogue of aircraft [usually used] for
lease or sale.
POS 1 Peacetime operating stocks.
2 Position.
3 Positive.
posigrade In direction of travel, hence * rocket increases
speed of satellite in order to reach higher orbit. Opposite
of retrograde.
POS-Init Position initialization.
position 1 For celestial body, bearing and altitude.
2 Location of crew member, esp. in military aircraft.
3 Location of manually aimed defensive gun(s) in military
aircraft (today archaic); gun *.
4 Location of AAA defending land target; gun *.
5 To fly aircraft to where it is needed; hence * or
positioning flight.
positive stability
position error That induced in ASI system by fact that
stagnation pressure sensed is seldom that of true free
stream (see airspeed).
positioning Flying aircraft to airport from which
productive [commercial carrier or business] flight will
start. Rarely, to launch point of military mission.
position light See navigation light.
position line Line along which vehicle is known to be at
particular moment, eg by taking VOR bearing. Two PLs
are needed for fix.
position stabilized Held to linear trajectory, eg LOS, in
absence of commanding signal (eg antitank missiles).
positive acceleration Acceleration upwards along OZ
axis, to right along OY and forwards (ie to increase speed)
along OX. Axes are always vehicle related.
positive area That enclosed on tephigram between path
of rising particle and surrounding air when particle is
throughout warmer than surroundings.
positive coarse pitch Locked minimum-drag setting of
non-feathering propeller after engine failure.
positive control 1 Operation of air traffic in radar/nonradar
ground control environment in which positive
identification, tracking and direction of all aircraft in
airspace is conducted by authorized agency (DoD).
2 Command/control and release procedures, and
operational procedures that provide acceptable level of
assurance against misuse of nuclear warheads, when these
warheads are part of a weapon system (USAF).
Positive Control Line Notional frontier at which, in time
of crisis, NW-armed aircraft would wait for PRM4; in
1960–90 the PCL for RAF Strike Command was 8° E.
positive coupling Mutually inductive coupling such that
increase in one coil induces rising voltage in other similar
in sense to that caused by increasing current in other.
positive-displacement pump One delivering fluid in
discrete parcels in irreversible way, eg pumps using
pistons, vanes or gearwheels in contrast to centrifugal
blower.
positive-driven supercharger Mechanical drive as
distinct from turbo.
positive-expulsion propellant system One in which liquid
propellants are forced from container by gas pressure, esp.
acting on flexible bag containing propellant(s).
positive feedback Feedback that results in increasing
amplification; also called regenerative.
positive g See positive acceleration.
positive-identification and radar advisory zone Specified
area established for identification and flight-following of
aircraft in vicinity of fleet defended area.
positive ion One deficient in one or more electrons.
positive pitch 1 Nose-up.
2 Propeller set for forward flight as distinct from
braking.
positive pressure cabin Arch., see pressure cabin.
Positive Recall An order to turn back before reaching
the Go-NoGo Line [see Automatic*] (USAF, RAF).
Positive Release Message Brief command sent with
authority of head of state, authorizing bomber to cross
Positive Control Line and drop NW on designated target,
in effect start of WW3 (USAF, RAF).
positive rolling moment Tending to roll right-wingdown.
positive stability Aeroplane tends of own accord
to resume original condition, esp. level flight, after
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