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pcBIRD
pciBIRD A 6-DOF magnetic tracker with processor
card.
PCID Preliminary change in design.
PCIDM Personal-control, or plug-in card, improved
data modem.
PCIG Personal-computer image generator.
PCIP Precipitation.
PCIPB President’s Critical-Infrastructure Protection
Board (US).
PCL 1 Power control lever [not flight controls].
2 Pilot-controlled [cabin] lighting.
3 Passive coherent location.
PCLL Persistent cell [storm stays in same place].
PCM 1 Pulse-code modulation, or modulated.
2 Pyrotechnic countermeasures.
3 Phase-control module.
4 Post-crash management.
5 Parametric cost modelling.
6 Prearranged contact mode.
7 Power-converter module.
Pc max Maximum chamber pressure (solid rocket
motor).
PCMCIA Personal-computer memory-card interface
association.
PCN 1 Pavement Classification Number; part of ICAO
standard ACN-PCN system for relating aircraft footprints
to pavement strengths [Annex 14, Amdt. 35].
2 Personal communications network.
PCO 1 Photochemical oxidant, = smog.
2 Procuring (or procurement) contracting officer
(DoD).
PCOA Phase-control-only array.
PCP 1 Platoon command post (SAM).
2 Program change proposal.
PCPN Precipitation amount.
PCR Programme commitment review.
P cr Critical [e.g. buckling] load.
PCRT Projection CRT.
PCS 1 Performance command system.
2 Portable, or piloting, control station (RPV).
3 Permanent change of station (military).
4 Pitch (or powerplant) control system.
5 Power conditioning system.
PCSA Police Community Support Officer (UK
airports).
PCSB Pulse-coded scanning beam.
PCSC Precision-cast single-crystal.
PCSV Pilot-to-controller service.
PCT 1 Power control test.
2 Portable common tool [software; E adds environment,
I interface].
PCU 1 Powered-, or power-, control unit (flight
controls).
2 Pilot’s, or passenger, or parachute, or portable, or
propeller, or power (engine), control unit.
3 Pod conditioning unit.
4 Pitch-change unit (helo).
PCV Pneumatic control valve.
PCZ Positive-control zone.
PD 1 Pulse Doppler.
2 Powered, or profile, descent.
3 Power-doubler (radio).
4 Preliminary design.
5 Project definition (abb. results in confusion with [4]).
6 Period (full stop) in message.
7 Pre-digital.
8 Presidential decision (US).
9 Procurement document.
10 Probability of detection.
11 Pictorial display [/CLC adds course-line computer].
12 Point detonating.
13 Programme Director.
14 Personal display (PCU2).
15 Pilot deviation.
Pd Packet mode, data. GPS com. link used for
signalling and ground/air messages.
P d 1 Probability of detection in single look or sweep
(radar).
2 Dynamic pressure.
p.d. Potential difference.
PDA, p.d.a. 1 Post-deflection modulation.
2 Photon detector assembly (space telescope).
3 Problem-detection audit.
4 Personal digital assistant.
5 Premature-descent alert.
6 Power-distribution assembly.
PDADS Passenger digital-activated display system.
PDAF Probabilistic data association filtering.
PDAM Precision direct-attack munition.
PD&E Procedures development and evaluation.
PDAR Preferential departure and arrival route.
PDAT Portable data access terminal.
PDB 1 Precision digital barometer.
2 Performance data-base.
PDBS Pilot data, or direct, broadcast system.
PDC 1 Performance data computer.
2 Public dividend capital.
3 Personnel despatch centre.
4 Programme development card; /PMM adds performance-monitor
module.
5 Power distribution centre.
6 Pre-departure clearance.
7 Pressure-drop control.
PDCG Pressure-drop control governor.
PDCO Pressure-drop control orifice.
PDCS Performance-data computer system (Lear-
Siegler/Boeing).
PDCU Panel data concentration unit.
PDCV Pressure-drop control valve.
PDD 1 Post-delivery development.
2 Package design document.
PDDI Product definition data interface.
PDE 1 Pulse detonator, or detonation, engine.
2 Partial differential equation[s].
3 Power drive electronics.
4 See PD&E.
PDES 1 Pulse-Doppler elevation scan; PDNES plus
electronic scanning in vertical plane to give target height.
2 Product-data exchange specification.
PDEW [Passengers] per day each way, measure of total
flow.
PDF 1 Precision direction finding.
2 Primary display function.
3 Portable document file [F adds format].
4 Paint-definition freeze [last point at which customer
can change specification].
5 Probability desnity, or distribution, function.
PDFN Phase-distortion at first null.
PDFN
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