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P-LOCAAS
P-LOCAAS Powered derivative of the low-cost
autonomous attack submunition.
Plod Passenger landed on deck (carrier onboard
delivery).
PLOG Pilot’s [flight-planning] log.
Plog Pilot-log record[s], no formal definition.
Plonk AC2 or ACH/GD, lowest form of life (RAF,
WW2).
plot 1 Graphical representation of two or more
variables on 2-D surface.
2 Graphical construction for solving navigation
problems, eg triangle of velocities.
3 Map, chart or graph representing data of any sort
(DoD).
4 Visual display, eg on radar, of aerial object at particular
time; hence * extraction.
5 Portion of map or overlay showing outlines of areas
covered by reconnaissance or survey photographs.
plot extraction Translating radar plot (4) into quantified
target position information, formerly done manually.
plot extractor Electronic system which detects replies
from primary or secondary radar and, after making
validity check, digitizes information ready for transmission
over narrow-band link equipment or high-grade
telephone line; where input is SSR basic range/bearing
information can be supplemented by identity and height.
‘Extraction’ derives from fact system eliminates information
not needed.
plotting board Large horizontal (rarely vertical) surface
upon which positions of moving objects are shown with
respect to co-ordinates or fixed reference points.
plotting chart Chart designed for graphical methods of
navigation.
ploughing, plowing Taxiing marine aircraft at below
planing speed.
PLP 1 Pipeline patrol.
2 Parallel-line planform.
PLRO Plain-language readout.
PLRS Precision (or position) location (and) reporting
system.
PLS 1 Precision landing system; R adds receiver.
2 Palletized loading system.
3 Personnel locator, or location, system.
4 Plasma subsystem, to measure solar wind.
PLSS 1 Precision location strike system.
2 Portable life-support system.
PLU 1 Position (or preservation of) location uncertainty.
2 Program load unit.
plug 1 Extra section, usually of constant cross-section,
added in front of or behind wing when stretching fuselage.
2 Air-refuelling contact, hence wet *, dry *.
3 As verb, one meaning is to blank over passenger
window with metal skin.
plug aileron Has form of curved sheet forming segment
of cylinder, extended on pivoted brackets from curved slot
in wing.
plug door One so designed, eg with inward/upward
travel or with retractable upper and lower portions, that
it is larger than doorway, two mating with thick tapered
edges to increase security of pressurized fuselage.
Pressurization load merely forces door more tightly
against frame.
plug gauge Male-type gauge, not always of circular
PM
cross-section and often tapered or threaded, for checking
dimensions of holes and internal threads.
plug inlet One form of inlet for air-breathing propulsion
at Mach 3.5–6 in which axisymmetric duct tapers from
sharp lip to rear, and contains large plug (spike) which
when translated fully aft can seal flow; in most forms rearward
spike travel renders shock-on-lip operation
impossible.
plug nozzle Proposed for rocket engines: combustion
chamber is annular toroidal form discharging around
central cone with curved profile which converts initial
inwards radial component into pure axial flow. Also
called spike nozzle.
plug ring Translating ring surrounding rear of piston
engine cowl to control cooling airflow; not necessarily
provided with hinged flaps or shutters (ie gills).
plug section See plug 1.
plug tap Final non-bevelled or bottoming tap for
completing threaded hole.
plug weld One made by drilling through part of structure,
eg boom splice or skin/stringer, and welding through
hole to increase strength of joint.
plug window Overlarge window with tapered periphery
(as plug door) used as emergency exit in pressurized fuselage.
plumber[s] Ground crew (RAF colloq.).
Plumbicon Photoconductive camera tube similar to
vidicon but using semiconductor PbO target doped to
behave as reverse-biased PIN.
plumbing Pipework for liquid systems, eg hydraulics,
lube oil, Lox etc (colloq.).
plume Originally having specific applications, today a
general word meaning entire wake from jet (airbreathing
or rocket) bounded at periphery and at more vague downstream
extremity by envelope enclosing all parts having
significant effects on environment, eg thermal, aerodynamic,
acoustic, contrail formation or as IR source.
plume target Aerial target emitting plume simulating
that from hostile jet aircraft.
Plus Patient-loading utility system.
plus count Forward count begun at lift-off of spaceflight,
continued throughout mission to provide GET
reference.
plutonium Silvery metal, many isotopes, all radioactive
and toxic, density 19.8, MPt (typical) 641°C, most
important constituent of NW devices, alone or with an
alloy, symbol Pu.
pluviometer Rain gauge.
PLV Payload launch vehicle (ABV).
PLVL Present level.
PLW Ploughed (US).
PLWS Precision lighting warning system.
Plymetal Plywood/aluminium sandwiches, invariably
non-structural.
PLZT 1 Lead lanthanum zirconate titanate.
2 Polarized lead/zinc titanate.
PM 1 Pulse modulation.
2 Phase modulation, or modulated.
3 Permanent magnet.
4 Program(me) manager, or management.
5 Powder metallurgy.
6 Pressurized module.
7 Poly medialite.
8 Power management.
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