1Dk4eXg

pitch trimmer
pitch trimmer Scissors link connecting bottom of mainleg
outer casing and one end of landing gear bogie beam.
pitch-up Uncommanded positive pitch (1) experienced
by some aeroplanes at high subsonic Mach numbers or
(tip stall on swept wing or tailplane in wing downwash) at
large AOA.
Pitho Hard tool steel formerly used for piston-engine
valves.
PITL Pilot in the loop [of the flight-control system].
pitot bomb Pitot head carried on free-weathercocking
mass towed on cable.
pitot comb Row of pitot tubes, eg in vertical row behind
wing.
pitot head Sensing head for pitot/static system. In case
where static pressure is taken from skin vent, pitot
pressure only, thus essentially = pitot tube.
pitot pressure That sensed by pitot head, intended to be
close to stagnation pressure.
pitot rake See pitot comb.
PitotShield Weatherproof covering for pitot head with
scarlet banner [tears off on takeoff if inadvertently left in
place].
pitot/static system Instrumentation system fed by
combination of pitot pressure and local static pressure,
difference giving dynamic head and thus ASIR.
pitot traverse Taking successive measures of pitot pressure
under same conditions but at different places, esp.
along vertical (less commonly horizontal) line in wake of
wing or other body; result indicates fluid momentum
transfer and thus drag.
pitot tube Open-ended tube facing forwards into fluid
flow, thus generating internal pressure equal to stagnation
pressure (in case of supersonic flow, that downstream of
normal shock).
PITS, Pits Passive identification and targeting system.
PIU 1 Pilot-induced undulation (PIO is better).
2 Processor, or pylon, or programmable, interface unit.
3 Intermediate contingency power (F).
4 Plasma ignition unit.
PIV, p.i.v. 1 Pressure isolating valve.
2 Peak inverse voltage.
Piver Programmation et interprétation des vols d’engins
de reconnaissance (F).
pivot-door reverser Jet-engine [usually turbofan]
reverser in which either the fan jet [only] is deflected by
from two to four doors, or the entire engine efflux is
deflected, usually by two doors pivoted on swinging links.
PIXE Pronounced pixie, proton-induced X-ray
emission, ion-beam technique.
pixel Picture element, from which electronically transmitted
picture is assembled.
PJ Parajumper, in helo rescue crew.
Pj 1 Radar received-power from jammer.
2 Jetpipe pressure.
PJBD Permanent Joint Board on, or of, Defence
(Canada/US).
PJC Permanent Joint Council (Russia-NATO).
PJE Parachute-jumping exercise.
PJF Partially jet-borne flight.
PJH PLRS/JTIDS hybrid.
PJI Parachute-jumping instructor.
PJND Perceived just-noticeable difference[s].
PK, P k 1 Kill probability.
2 Peak.
Planck Law
PkAF Pakistani air force (UK usage].
PKB Programmable keyboard.
PKD 1 Path of known delay.
2 Parts knock-down, aircraft or other product supplied
unassembled.
PKE Pluto Kuiper Express (NASA).
PKI Public key infrastructure.
PKM Perigee kick motor.
PKO Cosmic (space) defence forces (USSR).
PKP 1 Passenger-kilometres performed.
2 Predicted kill point.
PK screw Parker-Kalon.
PL 1 Position line.
2 Plain language (often P/L).
3 Pulse, or parameter, length.
4 Pilote de ligne (F).
5 Parts list.
6 Powered lift; often used for helicopter power loading
T/P.
7 Primary lighting.
8 Public Law (US).
9 Power line (d.c. electrics).
P/L 1 Payload.
2 Plain language.
3 Penetrator/lander [lunar].
PLA 1 Programmable logic array.
2 Power-lever angle.
3 Power-lift aircraft.
4 Pre-launch activites, for new aircraft.
5 Post-launch autonomy.
6 Practice low approach.
7 Plain-language address.
8 Private pilot, lighter-than-air, airship.
PLAB Napalm (USSR, R).
placard value Published numerical values of aircraft
performance, esp. those concerned with safety or limiting
speeds and often displayed on placard (small plate) fixed
in cockpit.
place Seat; hence ‘4-* ship’ = four-seat aircraft (US
usage).
PLACO, Placo Planning committee (ISO).
Plaid Precision location and identification.
plain bearing One in which rotating shaft is simply run
in surrounding fixed support, usually lined with bearing
metal, without needles, rollers, balls or dynamic pressure
from air or gas, but with interposed oil film.
plain flap Simple flap in which trailing edge of wing is
hinged.
plain language Message not coded for security.
plan One of three basic orthogonal views, that showing
object from above; hence *-form.
planar Essentially lying in one plane, 2-D; hence * technology
or * electronics include solid-state devices
constructed as various deposited layers, with etching,
metallization and other layer-modification.
planar-array radar One whose aerial comprises
numerous (normally identical) elements in flat array;
probably electronically scanned and probably synonymous
with phased-array.
Planck constant Symbol h, = 6.626196 [a later value is
6.6260755] × 10 –34 Js.
Planck Law Fundamental law of quantum theory: E =
hν where E is value of quantum in units of energy, h is
Planck constant and ν is frequency.
498