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P
P 1 Generalized symbol for force, or a point load.
2 Power, esp. bhp of shaft engine, or peak power of
transmitted signal; unit, watt.
3 Aircraft category, pursuit (USA, USAS, USAAC,
USAAF, 1925–47, USN 1923), and patrol (USN from
1923, USAF from 1962).
4 Prohibited area.
5 Poise [see entry]
6 Period, eg orbital.
7 Aircraft designation suffix, photographic (USN, to
1962).
8 Pressure; normally p but gas-turbine pressures
normally written P 1 , P 2 etc.
9 Pulsed, or pulse (eg with suffix numeral P1, P2 etc).
10 Pilot, with numerical suffix 1, 2, 3 etc to show hierarchical
ranking of pilots in same crew.
11 Prefix, plus (wind component).
12 Production cost.
13 Ratio of full-scale length to model length, esp. in
radio aerials and related fields.
14 Probability.
15 Telecom code: aircraft has Tacan only and 4096-
code transponder.
16 Radar (JETDS).
17 Missile launch environment: soft pad (DoD).
18 Phosphorus.
19 Provisional.
20 Aerospace craft (FAI category).
21 Primary, primary frequency, or winding.
22 Precision (DME, GPS, MLS).
23 Packet (TDM mode).
24 Paved surface.
25 Prefix peta = 10 15 , thousand million million.
26 Airport with instrument-approach procedure; also
means PAPI.
27 Number of persons on board.
28 Polar air.
29 Positive.
30 Precipitation.
31 Prototype.
32 Propeller pitch.
33 Polarization [electric].
34 Wing planform shape parameter, S/bl, where S is
area, b span and l chord from LE at root to TE at tip.
35 Spectral density [covariance] matrix.
p 1 Prefix pico, = × 10 –12 .
2 Generalized symbol for pressure.
3 Structural pitch.
4 Structural stress.
5 Pound mass (ambiguous, eg psi, see next).
6 Per (ambiguous, eg lb psi).
7 Parts (eg ppm, parts per million).
8 Port (ie, left).
9 Pentode.
10 Pulse-modulated radio emission.
11 Plate (electrical).
12 Generalized symbol for positive or positive values,
eg *-type semiconductor.
13 Angular velocity in roll; roll-rate output.
14 Momentum.
15 Helicopter-rotor blade spanwise, location of
maximum camber.
16 Laplace variable.
17 Subscript, parasitic.
p– 1 Average pressure difference across upper/lower
surfaces of aerofoil.
2 Specific weight (air-breathing jet engine).
3 Average rocket-motor chamber pressure.
4 Generalized symbol for averaged pressures.
5 Non-dimensional rate of roll, p13/.
P 0 Total static pressure head; stagnation pressure.
P 1 1 Compressor inlet total pressure.
2 First pilot, captain of aircraft.
P 12 , P ½ Fan inlet pressure.
P 2
1 Compressor delivery pressure (single-spool) or fan
delivery.
2 Copilot.
3 Two PAPIs.
P2P Confusingly, peer-to-peer.
P Compressor delivery pressure (two-spool).
P 3 1 Public/private partnership.
2 Pulse-pair processing.
P 3 I Pre-planned, or preprogrammed, product [or
program for] improvement (pronounced P-cubed I).
P4 Runway has 4 PAPIs.
P.4, P.6 Standard magnetic compasses (UK, 1930–50).
pα Free-stream pressure, esp. around jet engine.
P-alt Pressure altitude.
P-band Frequency band, 225–390 MHz (Appendix 2).
P-channel Packet-mode channel, in two forms, Pd and
Psmc.
P-charge Projectile-charge warhead (SAM).
P-clamp For ordinary electric/electronic cables.
P-clip For convoluted conduit with raised rib to prevent
lateral movement.
P-code Precise or protected navigation code, billions of
pseudo-random numbers on 10.23 MHz repeating each
267 days, each 168-h (one week) segment unique to particular
GPS satellite.
P-display Radar display of PPI type.
P-factor 1 Asymmetric propeller loading.
2 Effect on propeller aircraft of spiral slipstream[s].
P-lead Primary (switch) cable of magneto.
P-line Electric cross-country power line.
P-time Proposed departure time.
p-type semiconductor One in which majority of chargecarriers
are holes (electron absences).
PA 1 Public, or passenger, address.
2 Performance appraisal.
3 Public affairs.
4 Proposal architecture.
5 Product assurance (especially software).
6 Precision attitude.
7 Pilot’s associate, or assistant.
8 Porte avions, aircraft carrier (F).
9 Pressure altitude.
10 Pursuit, aircooled (USA 1919–24).
11 Power[ed] approach [esp. to carrier].
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