1Dk4eXg

PSA
2 Primary/search director.
3 Pressure-sensitive.
4 Primary to secondary (airports).
PSA 1 Prefabricated surface, or surfacing, aluminium,
or semi-permanent airfield [meanings can be same].
2 Provisional site acceptance.
3 Pressure-swing absorption.
4 Pilot’s associate.
5 Power-spindle angle (TLA is preferred).
6 Lb/in 2 absolute (deprecated).
7 Problem-statement analyser.
8 Precision Strike Association (US).
9 Plasma stealth antenna.
10 Power supply, or switching, assembly.
11 Process-simulation article.
12 Point of service activation [comsat].
p.s.a. Passed staff college [air] (RAF).
PSAC Presidential Science Advisory Committee (US).
PSAI Public Safety Aviation Institute (US).
PSAS 1 Pitch, or primary, stability augmentation
system.
2 Program support/annual sustaining.
3 Persistent surface-attack system (USAF).
PSB 1 Plough, sweeper and blower [snow].
2 Professional Standards Board (RAeS).
PSBL Possible.
PSBR Public-sector borrowing requirement.
PSC 1 Principal site concept (USN).
2 Product-support committee.
3 Program support contract (NASA).
4 Performance-seeking control.
5 Photo safety chase [TB adds testbed].
6 Plasma-sprayed ceramic.
7 Public-sector comparator.
8 Photographic sensor control; S adds system.
PSCMMS Propulsion-system control, monitoring and
maintenance system.
PSCU Phase-shifter control unit.
PSD 1 Power spectral density.
2 Physiological Support Division (SR-71 ops).
3 Port-sharing device.
4 Preliminary System Design.
5 Passive stealth detection.
PSDF Power spectral density function.
PSDN Packet-, or public-, switched data, or digital,
network.
PSDP Programmable-signal data-processor.
PSDS2 Persistent surveillance and dissemination
system of systems (USA).
PSDU Phase-shifter drive unit.
PSE 1 Passenger service equipment (reading lights, call
button etc).
2 Passive seismic experiment.
3 Project support environment.
4 Phase-shifting element.
5 Packet switching exchange.
6 Peculiar synchronization, or support, equipment.
7 Problem-solving environment.
PSEU Proximity slat, or sensor, or switch, electronics
unit.
pseudo-adiabatic Process by which saturated air parcel
undergoes adiabatic transformation, water being
assumed to fall out as condensed.
pseudo aircraft system Hi-fi multi-aircraft real-time
psid, PSID
simulation environment to support ATC research (NASA
Ames).
pseudo analog Electronic display which simulates
traditional instrument, eg by using fixed LED matrix to
form ‘dial’ plus computer-driven LEDs to generate
‘pointer’ and alphanumerics.
pseudo fly-by-wire Flight control system in which at
least one axis of control is normally, at one point at least,
electrical; * systems have capability for manual reversion
or override.
Pseudolite A particular scheme using surrogate satellites
in a HALE UAV to counter hostile GPS jamming.
pseudolite Transmitter of differential GPS signals from
ground to improve acquisition and accuracy [from
‘pseudo-satellite’].
pseudonoise Technique in which PN code generated
sends out wideband noise-like signal which is then viewed
as carrier on which message is imposed; usually directsequence
modulation approach is used in which PN code
directly balance-modulates carrier.
pseudopursuit navigation Homing method in which
missile is directed towards target instantaneous position
in azimuth while pursuit navigation in elevation is delayed
until more favourable attack angle (note: this is not the
same as AOA) on target is achieved (DoD).
pseudo radar ADS (5) with display.
pseudo-random noise See pseudonoise.
pseudorange Satellite-derived range uncorrected for
errors in synchronization between the two clocks.
pseudo stereo 1 False impression of stereoscopic relief
(ASCC).
2 Common audio meaning, simulating stereophonic by
using two speakers, one via brief delay, from single
channel.
pseudo-3-D Large family of techniques for generating
subjective impression of three dimensions on (usually)
planar display. One is psuedo stereo (1); various methods
used in PPI displays and several techniques in computerdriven
OTW displays for simulators, some coming under
heading of CGI.
PSF 1 Phosphosilicate fibre (optical fibre).
2 Polystyrene foam.
3 Personnel services flight (RAF).
psf, PSF Pounds per square foot (non-SI and in any case
strongly discouraged).
PSFD Product, or production, sustainment and followon
development.
PSFP Pre-simulator familiarization panel.
PSG 1 Post-stall gyration.
2 Passing, passage.
PSGR Passenger[s].
PSH Prime standard and handbook.
psi, PSI 1 Pounds per square inch.
2 Permanent staff instructor.
3 Pulsing, or pulsating, slope indicator; -L or -R shows
which side of runway.
4 Proliferation security initiatve.
5 President of the Service Institute.
6 Product-support integrator.
7 Person of special interest.
psi Pounds per square inch.
psia, PSIA 1 Pounds per square inch, absolute.
2 Pounds per square inch, ambient.
psid, PSID Pounds per square inch, differential.
523