Acronym Listing P

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B |

C |

D |

E |

F |

G |

H |

I |

J |

K |

L |

M |

N |

O |

P |

Q |

R |

S |

T |

U |

V |

W |

X |

Y |

PAN — PCA — PDP — PFO — PIG — PKI — PMC — PO — PPC — PRL — PT

ACRONYM	DEFINITION	CONTRIBUTOR
p	Proton	CASI
P	Pultrusion	CASI
P&CS	Planning and Control System	Goddard
P&S	Planning and Scheduling	Goddard
P.A.C.M.	Pulse Amplitude Code Modulation	CASI
P/AWS	Paging and Area Warning System	Goddard
P/C CLLS	Physical/Chemical Closed Loop Life Support	CASI
P/K	Printer/Keyboard	CASI
P/L	Payload	CASI
P/OF	Pinhole Occulter Facility	CASI
P/P	Power Propulsion	CASI
P/S	Power Supply	Goddard
P/SA	Pre-Amp/Splitter Assembly	Goddard
PA	Performance Appraisal (OHR)	Langley
PA	Performance Assurance	Goddard
PA	Power Amplifier	Goddard
PA	Privacy Act	Goddard
PA	Product Assurance	Goddard
PA	Picatinny Arsenal, Dover, NJ	CASI
PABSI	Profiling A-Band Spectrometer/Visible Imager	Goddard
PABX	Private Automated Branch Exchange	Goddard
PAC	Predict Application Control	Goddard
PAC	Primex Aerospace Corporation	Goddard
PACE	Particles, Atmosphere and Chemistry Experiment	Langley
PACE	Power Assisted Glove End Effector	CASI
PACE	Pre-College Awards for Excellence in Mathematics, Science, Engineering, and Technology	Goddard
PACE	Physics and Chemistry Experiment in Space	CASI
PACI	Payload/Attitude Control Interface	Goddard
PACOR	Packet Processor	Goddard
PACS	Pan American Climate Studies	Goddard
PAD	Program Approval Document (NASA) (KSC)	Langley
PAD	Project Authorization Document	Goddard
PAD	Pulse Amplitude Discriminator	Goddard
PAD	Polar Auroral Dynamics	CASI
PAD	Propellant Actuated Devices	CASI
PAD	Pulsed Activation Doppler	CASI
PAE	Performance Assurance Engineer	Goddard
PAE	Product Assurance Engineer	Goddard
PAET	Planetary Atmosphere Experiments Test	CASI
PAF	Payload Adaptor Fitting	Goddard
PAF	Payload Attach Fitting	Goddard
PAGEOS	Passive Geodetic Earth Orbiting Satellite	CASI
PAH	Polycyclic Aromatic Hydrocarbon	CASI
PAIP	Performance Assurance Implementation Plan	Goddard
PAL	Parts Accumulation List	Goddard
PAL	Programmable Array Logic	Goddard
PAL	Pallet (Spacelab Pallet Structure)	CASI
PALAPA	(Synchronous satellite communication system for Indonesia)	CASI
PAM	Payload Accommodation Manager	CASI
PAM	Payload Assist Module	CASI
PAM	Peripheral Adapter Module	CASI
PAM	Pulse Amplitude Modulation	CASI
PAMIS	Processing And Manufacturing In Space	CASI
PAMPL	Program Approved Materials and Processes Selection List	Goddard
PAMS	Passive Aerodynamic Magnetic Satellite	Goddard
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PAN	Peroxyacetyl Nitrates	Langley
PAN chemicals	(PeroxyAcetylNitratol)	CASI
PANT	Proboscoid Ablative Nose Tips (Program)	CASI
PAO	Program Analysis Office	Goddard
PAO	Public Affairs Office	Goddard
PAO	Public Affairs Officer	Goddard
PAP	Payload Attach Plate	Goddard
PAP	Performance Assurance Plan	Goddard
PAP	Performance Assurance Procedures	Goddard
PAP	Product Assurance Plan	Langley
PAPCPT	Provide Aerospace Products and Capabilities Process Team	Goddard
PAPL	Program Approved Parts List	Goddard
PAPL	Project Approved Parts List	Goddard
PAR	Performance Assurance Requirements	Goddard
PAR	Personnel Action Request	Goddard
PAR	Photosynthetically Active Radiation	Goddard
PAR	Problem Action Record	Goddard
PAR	Precision Approach Radar	CASI
PARC	Public Access Resource Center	Goddard
PARCA	Program for Arctic Regional Climate Assessment	Goddard
PARCS	Primary Atomic Reference Clock in Space	CASI
PARE	Physiological & Anatomical Rodent Experiment	CASI
PARESEV	Paraglider Research Vehicle 91, IA, II, etc.	CASI
PAS	Planning and Scheduling	Goddard
PAS-C	PDES Application Protocol Suite for Composites	Goddard
PASDE	Photogrametric Appendage Structural Dynamics Experiment	Goddard
PASO	Program and Specific Objectives	CASI
PASP	Publication of the Astronomical Society of the Pacific	Goddard
PASS	POCC Applications Software Support	Goddard
PASS	Primary Avionics Software System (Space Shuttle)	CASI
PASS	Pressurized Air Starter System	CASI
PASSOPS	POCC Applications Software Support Operations	Goddard
PAT	Process Action Team	CASI
PATGEN	Pattern Generation	Langley
PAVDO	Photo and Video Documentation Office	Goddard
PB	Pitney-Bowes, Inc.	Langley
PBAA	Polybutadiene Acrylic Acid (Copolymer)	CASI
PBAN	PBI Polybenzimidazole	CASI
PBAN	Polybutadiene Acrylonitrile (Copolymer)	CASI
PBC	Performance Based Contracting	Goddard
PBE	Pool Boiling Experiment	CASI
PBIO	Processor Backplane I/O	Goddard
PBL	Planetary Boundary Layer	CASI
PBMA	Process Based Mission Assurance	Glenn
PBRE	Pebble Bed Reactor Experiment	CASI
PBS	Power Bus Simulator	Goddard
PBS	Public Broadcasting System	Goddard
PBSC	Performance Based Service Contracting	Langley
PBW	Proportional Bandwidth	CASI
PBX	Polybutadiene Tetranitramine	CASI
PC	Personal Computer	Goddard
PC	Photo Conductive	Goddard
PC	Planetary Camera (part of WF/PC or WFPC2)	Goddard
PC	Power Controller	Goddard
PC	Printed Circuit	Goddard
PC	Pulse Command	Goddard
P-C	Performance-Cost	Goddard
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PCA	Physical Configuration Audit	Goddard
PCA	Printed Circuit Assembly	Goddard
PCA	Program Commitment Agreement	Goddard
PCA	Propellant Control Assembly	Goddard
PCA	Proportional Counter Array	Goddard
PCA	Polar Cap Absorption	CASI
PCA	Portland Cement Association	CASI
PCA	Positive Control Area	CASI
PCA	Power Control Assembly (Space Shuttle)	CASI
PCA	Prime Candidate Alloy	CASI
PCA	Propulsion Controlled Aircraft	CASI
PCAC	Partially Conserved AxialVector Current	CASI
PCAC	Partial Conserved Axial Currents	CASI
PCB	Parts Control Board	Goddard
PCB	Printed Circuit Board	Goddard
PCB	Program Control Board	Goddard
PCC	Program for Cooperative Cataloging	CASI
PCC	Project Cost Commitments	Goddard
PCD	Photon Counting Detector	Goddard
PCD	Program Commitment Document	Goddard
PCD	Project Commitment Document (SOMO)	Goddard
PCDBR	Data Collection Platform, Brazil (Platformas de Coleta de Dados)	CASI
PCDS	Power Converter and Distribution System	Goddard
PCDU	Power Conversion and Distribution Unit	Goddard
PCE	Power Control Electronics	Goddard
PCE	Power Conversion Electronics	Goddard
PCE	Process Communications Engineer	Goddard
PCEA	Pointing Control Electronics Assembly	Goddard
PCENT	Gravitropic Responses of Plant Seedlings	CASI
PCG	Protein Crystal Growth	Goddard
PCGII	Protein Crystal Growth II	CASI
PCGIII	Protein Crystal Growth III	CASI
PCGPROTO	Protein Crystal Growth Prototype	CASI
PCGU	Protein Crystal Growth Unit	CASI
PCI	Peripheral Component Interface	Goddard
PCI	Personal Computer Interface	Goddard
PCI	Programmed Composites Inc.	Goddard
PCIE	President's Council on Integrity and Efficiency in Government	Langley
PCL	Parallel Communications Links	Goddard
PCM	Power Control Module	Goddard
PCM	Procurement Contract Management	Goddard
PCM	Pulse Code Modulation	CASI
PCM	Phase Change Material	CASI
PCMI	President's Council on Management Improvement	Langley
PCMU	Power Control Monitoring Unit	Goddard
PCMU	Propulsion Control and Monitor Unit	Goddard
PCN	Procurement Control Number	Goddard
PCN	Program Control Number	Langley
PCN	Project Control Number	Goddard
PCO	Procedure Change Order	Goddard
PCP	Parts Control Plan	Goddard
PCR	Payload Changeout Room	Goddard
PCS	Planning and Control System	Goddard
PCS	Pointing Control Subsystem	Goddard
PCS	Pressure Control System (Space Shuttle)	CASI
PCS	Pointing Control System	CASI
PCSIU	PCS Interface Unit	Goddard
PCTR	Physical Constants Testing Reactor	CASI
PCU	Power Conditioning Unit	Goddard
PCU	Power Converter Unit	Goddard
PCU	Power Control Unit	CASI
PCUA	Pressure Control Unit, ATLAS	CASI
PD	Position Description	Goddard
PD	Power Distribution	Goddard
PD	Product Data	Goddard
PD	Proportional and Derivative	Goddard
PDA	Percentage of Defectives Allowable	Goddard
PDA	Personal Digital Assistant	CASI
PDA	Photon Detector Assembly	Goddard
PDA	Power Distribution Assembly	Goddard
PDA	Preliminary Design Audit	Goddard
PDB	Project Database	Goddard
PDC	Project Design Center	Goddard
PDD	Payload Definition Document	Goddard
PDD	Product Definition Data	Goddard
PDDI	Product Definition Data Interface	Goddard
PDDU	Power Distribution and Drive Unit	Goddard
PDE	Product Data Exchange	Goddard
PDES	Product Data Exchange using STEP	Goddard
PDF	Payload Data Formatter	Goddard
PDF	Portable Document Format	CASI
PDF	Probability Density Function	CASI
PDF	Processor Defined Function	CASI
PDF	Programmable Data Format	Goddard
PDI	Payload Data Interleaver	Goddard
PDI	Professional Development Initiative	Goddard
PDL	Ponce de Leon	Goddard
PDL	Program Design Language	Goddard
PDLG	PitmanDunn Labs. Group, Frankford Arsenal, Philadelphia, Pa.	CASI
PDM	Primary Deployment Mechanism (Solar Array)	Goddard
PDM	Primary Drive Motor	Goddard
PDM	Product Data Management	Goddard
PDM	Propellant Distribution Module	Goddard
PDM	Pulse Duration Modulation	CASI
PDME	Precision Distance Measuring Equipment	CASI
PDMO	Product Data Management Office	Goddard
PDMP	Program Data Management Plan	Goddard
PDMP	Project Data Management Plan	CASI
PDO	Property Disposal Officer	Langley
PDOP	Position Dilution of Precision	CASI
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PDP	Professional Development Program	Goddard
PDP Computer	(Tradename for a PackardBell digital computer system)	CASI
PDPF	Packet Data Processing Facility	Goddard
PDR	Photo Dissociation Region	Goddard
PDR	Preliminary Design Review	CASI
PDR	Preferential Departure Route	CASI
PDRD	Program Definition and Requirements Document	Langley
PDRS/PFTA	Payload Deployment and Retrieval System/Payload Flight Test Article	CASI
PDS	Planetary Data System	CASI
PDSU	Power Distribution and Switching Unit	Goddard
PDSU	Power Distribution Servicing Unit	Goddard
PDT	Performance Demonstration Test	Goddard
PDT	Procurement Development Team	Goddard
PDT	Product Design Team	Goddard
PDT	Product Development Team	Goddard
PDT	Pacific Daylight Time	CASI
PDU	Power Distribution Unit	Goddard
PDU	Power Drive Unit (Space Shuttle)	CASI
PE	Program Engineer	Goddard
PE	Propulsion Equipment	Goddard
PEB	Performance Evaluation Board	Goddard
PEC	Passive Experiment Carrier (one of four exp. comprising MEEP)	Langley
PECL	Position Emitter Coupled Logic	Goddard
PED	Payload Element Developers	CASI
PED	Period End Date	CASI
PED	Phase Element Decomposition	CASI
PED	Platform Equipment Deck	Goddard
PED	Potential Energy Distribution	CASI
PED	Pyro-Electric Detector	CASI
PEGASUS	Pegasus Air-Breathing Launch Vehicle	CASI
PEGASUS	Power Generating System for Use in Space	CASI
PEM	Partial Environment Monitor	Goddard
PEM	Particle Environment Monitor	Langley
PEM	Production Efficiency Model	Goddard
PEM	Pacific Exploratory Mission	CASI
PEM	Proton Exchange Membrane	CASI
PEM-W	Pacific Exploratory Mission - West (GTE)	Langley
PEO	Polar Earth Orbit	CASI
PEP	Performance Evaluation Plan	Goddard
PEP	Proposal Entry Processor	Goddard
PEP	Power Extension Package	CASI
PER	Pre-Environmental Review	Goddard
PER	Preliminary Engineering Report (KSC)	Langley
PERR	Pre-Environmental Readiness Review	Goddard
PERT	Program Evaluation and Review Technique	CASI
PESS	Programmable Escape System Sequencer	CASI
PET	Piston Engine Technology	CASI
PET	Poly-Ethylene Terephthalate	CASI
PET	Positron Emission Tomography	CASI
PET	Production Environmental Test	CASI
PET	Proton Electron Telescope	CASI
PETN	Pentaerythritol Tetranitrate	CASI
PETS	Proximity Effect Tunneling Spectroscopy	CASI
PEU	Peripheral Electronics Unit	Goddard
PEU	Processing Electronics Unit	Goddard
PF	Proto Flight	Goddard
PFD	Primary Flight Display	CASI
PFES	Portable Field Emission Spectrometer	CASI
PFET	Positive Channel Field Effect Transistor	CASI
PFG	Perfluoroguanidine	CASI
PFM	Project Formulation Manager	Goddard
PFM	Proto-Flight Model	Goddard
PFM	Pulse Frequency Modulation	CASI
PFMS	Planar Flow Melt Spinning	CASI
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PFO	Project Formulation Office	Goddard
PFR	Prime Focal Ratio	Goddard
PFR	Portable Foot Restraint (Space Shuttle)	CASI
PFRR	Poker Flat Research Range	Goddard
PFS	Parallel File System	Langley
PFU	Proto-Flight Unit	Goddard
PG&S	Purchased Goods and Services	Goddard
PGHM	Payload Ground Handling Mechanism	CASI
PGS	Primary Guidance Subsystem	CASI
PGS	Product Generation System	CASI
PGSOW	Precision Guided Stand Off Weapons	CASI
PGT	Pistol Grip Tool	Goddard
PHA	Pulse Height Analysis	Goddard
PHA	Pulse Height Analyzer	Goddard
PHBW	Personal Hygiene Body Wipe	CASI
PHCF	Pituitary Growth Hormone Cell Function	CASI
PHE	Propellant Handling Unit	Goddard
PHS	Personal Hygiene Station (Space Shuttle)	CASI
PHSF	Payload Hazardous Servicing Facility	Goddard
PHY	Physical Layer Protocol	Goddard
PI	Payload Interrogator (Orbiter)	Goddard
PI	Proportional Integral	Goddard
PI	Principal Investigator	CASI
PI/TL	Principal Investigator/Team Leader	Goddard
PIA	Program Initiation Agreement	Langley
PIA	Propellant Isolation Assembly	Goddard
PIA	Particulate Impact Analyzer (Giotto)	CASI
PIC	Payload Interface Controller	Goddard
PIC	Procurement Information Circular	Goddard
PIC	Programmable Interrupt Controller (Computer science)	Langley
PIC	Particle-In-Cell	CASI
PICAO	Provisional International Civil Aviation Organization	CASI
PICASSO	Pathfinder Instruments for Cloud and Aerosol Spaceborne Observations	Goddard
PicassoCena	Pathfinder Instruments for Cloud and Aerosol Spaceborne Observations Climatologie Etendue des Nuages et des Aerosols	CASI
PICCA	Positive Ion Cluster Composition Analyzer	CASI
PID	Proportional Integral and Derivative	Goddard
PIDA	Payload Installation and Deployment Aid	Goddard
PIDAS	Portable Instantaneous Display and Analysis Spectrometer	Langley
PIDAS	Portable Instant Display and Analysis Spectrometer	CASI
PIDDP	Planetary Instrument Definition and Development Program	Goddard
PIDP	Programmable Indicator Data Processor	CASI
PIES	Positive Ion Ejection System	CASI
PIES	Pressure Inserted Echo Sounders	CASI
PIES	Project Independence Evaluation System	CASI
PIF	Payload Integration Facility	Goddard
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PIG	Pendulous Integrating Gyro	CASI
PIG	Phillips Ionization Gauge	CASI
PIG	Plasma Ion Generator	CASI
PIGA	Pendulous Integrating Gyro Accelerometer	CASI

PIGWAD	Planetary Interactive GIS ontheWeb Analyzable Database	CASI
PII	Plasma Ion Implantation	CASI
PII	Preliminary Item Identifier (assigned by publisher)	CASI
PIK	Potsdam Institute for Climate Impact Research	Goddard
PIL	Parts Identification List	Goddard
PILPS	Project for Intercomparison of Land Surface parameterization Schemes	Goddard
PIM	Process Integrated Mechanism	CASI
PIMMR	Passive Imaging Multichannel Microwave Radiometer	CASI
PIMR	Passive Imaging Microwave Radiometer	Goddard
PIMS	Plasma Interactions Monitoring System	CASI
PIN	Password Identification Number	Goddard
PIN	Personal Identification Number	Langley
PIN	Procurement Installation Number	Goddard
PIN	Project Identification Number	Goddard
PIND	Particle Impact Noise Detection	Goddard
PIO	Program Integration Office	Langley
PIO	Pilot Induced Oscillations	CASI
PIOFS	Parallel Input/Output File System	Langley
PIP	Parallel Image Processor	CASI
PIP	Participant Instrumentation Package	CASI
PIP	Payload Integration Plan	CASI
PIP	Plume Interference Prediction	CASI
PIP	Potential Integrator and Plotting	CASI
PIP	Precipitation Intercomparison Project	CASI
PIP	Precise Impulse Propulsion	CASI
PIP	Process Instrumentation Process	CASI
PIP	Product Improvement Program	CASI
PIP	Production Installation Procedures	Goddard
PIP	Professional Intern Program	Goddard
PIP	Project Implementation Plan	Goddard
PIP	Propellant Initiation Program	CASI
PIP	Pulsed Integrating Pendulum	CASI
PIREPS	Pilot Reports (pertaining to meteorological conditions)	CASI
PIRN	Preliminary Interface Revision Notice	Goddard
PIT	Post Installation Test	Goddard
PIT	Process Improvement Team	Goddard
PIT	Processor Interface Table	Goddard
PIT	Product Integration Team	Langley
PIT	Programmable Interval Timer	Langley
PIV	Particle Image Velocimetry	CASI
PIWG	Propulsion Instrumentation Working Group	Goddard
PIXE	Proton Induced Xray Emission	CASI
PIXIE	Polar Ionosphere Xray Imaging Experiment	CASI
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PKI	Public Key Infrastructure	Goddard
PL	Product Line	Langley
PL	Program Language	Langley
PL	Punch List	Langley
PL OPPTY	Payload Opportunity	CASI
PLAAR	Packaged Liquid Air Augmented Rockets	CASI
PLACE	Position, Location and Communications Experiment	CASI
PLAID	Patchy LandAtmosphere Interactive Dynamics	CASI
PLAN	Planetary Trajectory	CASI
PLANET	Planned Logistics Analysis and Evaluation Techniques	CASI
PLANET	Planning Evaluation Technique	CASI
PLAT	Pre-Launch Acceptance Test	Goddard
PLAT	Pilot Landing Air Television (System)	CASI
PLB	Payload Bay	Goddard
PLB	Payload Bay (Space Shuttle)	CASI
PLBD	Payload Bay Door	Goddard
PLC	Preliminary Load Cycle	Goddard
PLC	Programmable Logic Control (Computer science)	Langley
PLC	Payload Commander (Member of the Shuttle crew having overall crew responsibility for planning, integration, and onorbit coordination of payload mission activities.)	CASI
PLC	PortevinLe Chatelier	CASI
PLC	Pressurized Logistics Carrier	CASI
PLCC	Plastic Leaded Chip Carrier	Goddard
PLCP	Planning Command Pool	Goddard
PLCS	Product Life Cycle Support Committee	Goddard
PLCU	Propellant Level Control Unit	CASI
PLD	Programmable Logic Device	Langley
PLDS	Pilot Land Data System	CASI
PLF	Payload Fairing	Goddard
PLIE	Phase Linear Interferometer Experiment	CASI
PLL	Phase Lock Loop	CASI
PLLO	Phase Locked Local Oscillator	Goddard
PLM	Payload Module	Goddard
PLO	Phase Locked Oscillator	Goddard
PLS	Personnel Launch System (small Earth to orbit shuttle complement)	Langley
PLS	Primary Landing Site (Space Shuttle)	CASI
PLSS	Portable Life Support System	CASI
PLSS	Primary Life Support System	CASI
PLT	Post Launch Testing	CASI
PLT	Pilot (Member of the Shuttle crew)	CASI
PLUM	Polymerization With Light Under Microgravity	CASI
PM	Payload Module	Goddard
PM	Phase Modulation	Goddard
PM	Post Meridian (aftenoon)	Goddard
PM	Power Monitoring	Goddard
PM	Pressurized Module	CASI
PM	Preventative Maintenance	Goddard
PM	Primary Mirror	Goddard
PM	Program Manager	Goddard
PM	Project Management	Goddard
PM	Project Manager	Goddard
PM	Prototype Model	Goddard
PM	Polymer Morphology	CASI
PM&C	Program Management and Control (OHR)	Langley
PMA	Permanent Magnet Assembly	Goddard
PMAD	Power Management and Distribution	CASI
PMB	Performance Measurement Baseline	Langley
PMB	Personnel Management Branch	Goddard
PMBT	Propellant Mean Bulk Temperature	CASI
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PMC	Polyimide Matrix Composites	Goddard
PMC	Prime Mission Contract/Contractor	Goddard
PMC	Program Management Council	Goddard
PMC	Permanently Manned Capability	CASI
PMC	Polymer Matrix Composite	CASI
PMCD	Part Material Control Document	Goddard
PMD	Propulsion Management Device	Goddard
PMDB	Project Management Data Base	Goddard
PMDE	Project Management Development Emprise	Goddard
PMDP	Project Management Development Process	Goddard
PMDR	Procurement Management Data Report	Goddard
PME	Personnel Management Evaluation	Goddard
PMFA	Permanent Magnet Focus Assembly	Goddard
PMG	Plasma Motor Generator	CASI
PMGP	Planetary Materials and Geochemistry Program	CASI
PMH	Project Management Handbook	Goddard
PMIR	Pressure Modulator Infrared Radiometer	Goddard
PMIRR	Pressure Modulator Infrared Radiometer (Mars Observer)	CASI
PMIS	Project Management Information System	Goddard
PMMA	Polymethyl Methacrylate, an acrylic used for LIGA	Goddard
PMMR	Project Managers’ Monthly Review	Goddard
PMP	Program Management Plan (NASA)	Langley
PMP	Project Management Plan	Goddard
PMPCB	Parts, Material, and Processes Control Board	Goddard
PMPE	Program Materials and Processes Engineer	Goddard
PMPP	Personnel Management Practices and Procedures	Goddard
PMR	Passive Microwave Radiometer	Langley
PMR	Program Management Report/Review	Goddard
PMRC	Personnel Management Review Committee	Langley
PMRF	Pacific Missile Range Facilities	Goddard
PMRS	Performance Management and Recognition System	Goddard
PMS	Performance Management System	Langley
PMS	Performance Measurement System	Goddard
PMS	Personnel Management Specialist	Goddard
PMS	Problem Management System	Goddard
PMS	Processors, Memories, and Switches	Langley
PMS	Platform Management System	CASI
PMS	Pollution Monitoring Satellite	CASI
PMS	Propellant Management Subsystem	CASI
PMT	Photo Multiplier Tube	Goddard
PMT	Process Management Team	Goddard
PMT	Project Management Team	Langley
PMT	PhotoMultiplier Tubes	CASI
PMTP	Procurement Management Technology Program	Goddard
PMZF	Programmable MultiZone Furnace	CASI
PN	Procurement Notice	Goddard
PN	Pseudorandom Noise	Goddard
PN	Pseudo-random Number	Goddard
PN	Pseudonoise (sequence)	CASI
PNL	Pacific Naval Lab. (Canada)	CASI
PNM	Pulse Number Modulation	CASI
PNNL	Pacific Northwest National Laboratory	Goddard
PNS	Portsmouth Naval Shipyard, NH	CASI
PNSETL	Electrical Testing Lab., Portsmouth Naval Shipyard, NH	CASI
PNZ	Phytoplankton-nutrient-zooplankton	Goddard
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PO	Pick Off	Goddard
PO	Procurement Officer	Goddard
PO	Program Office	Goddard
PO	Purchase Order	Goddard
POA	Privately Owned Aircraft	Langley
POC	Point of Contact	CASI
POCC	Payload Operation Control Center	CASI
POCC	Project Operations Control Center	CASI
POCM	Parallel Ocean Climate Model	Goddard
POD	Project Operations Director	Goddard
PODAAC	Physical Oceanography Distribution Active Archive Center (JPL)	Goddard
PODPS	Post Observation Data Processing System	Goddard
PODS	Pilot Ocean Data System	CASI
POE	Parallel Operating Environment	Langley
POED	Post Office Engineering Dept. (Great Britain)	CASI
POEM	Polar Orbiting Earth Observing Mission	Langley
POEM	PolarOrbit Earth Observation Mission	CASI
POEMD	Plant Operations, Engineering, and Maintenance Division	Goddard
POEMS	Positron Electron Magnet Spectrometer	Goddard
POES	Polar Operational Environmental Satellite	Goddard
POES	Polar Orbiting Environmental Satellite	Goddard
POES	Polarorbiting Operational Environmental Satellite	CASI
POGO	Polar Orbiting Geophysical Observatory	CASI
POIC	Payload Operations Integration Center	CASI
POLAR	Polar Plasma Laboratory (ISTP spacecraft)	Goddard
POLARIS	Photochemistry of Ozone Loss in the Arctic Region In Summer	CASI
POLDER	Polarization and Directionality of Earth’s Reflectances	Goddard
POLES	Polar Exchange at the Sea Surface	Goddard
POLINAT	POLlution from aircraft emissions In the North ATlantic flight corridor	CASI
POLO	Polar Orbiting Lunar Observatory	CASI
POLTAZ	Epoxy Resin (Oxidizer binder)	CASI
POLYDOP	Polystation Doppler (Tracking system)	CASI
POM	Pick Off Mirror (WFPC)	Goddard
POM	Potential Monitor	Goddard
POMB	Plant Operations and Maintenance Branch	Goddard
POMC	Pick Off Mirror Cover (WFPC)	Goddard
POMD	Plant Operations and Maintenance Division	Goddard
POMM	Pick Off Mirror Mechanism (WFPC2)	Goddard
POP	Period of Performance	Goddard
POP	Place of Performance	Goddard
POP	Program Operating Plan	Goddard
POP	Perpendicular to Orbital Plane	CASI
POP	Polar Orbiting Platform	CASI
POR	Power Off Reset	Goddard
PORTIA	Piggyback Room Temperature Instrument for Astronomy	Goddard
PORTS	POCC Operations Real-Time Support	Goddard
PORTS	Preliminary Operations Requirements Test Support	Goddard
POSA	Passive Optical Samle Assembly	Langley
POT	Plan of Test	Langley
POT	Potentiometer (or Potentiometric)	Langley
POTS	Plain Old Telephone Services	Goddard
POTV	Personnel Orbit Transfer Vehicle	CASI
POV	privately owned vehicle	Langley
POWG	Payload Operations Working Group	Goddard
POWOW	POwer WithOut Wires	CASI
PP	Partial Pressure (or Peak Pressure)	CASI
PP	Particle Physics (or Particle Production)	CASI
PP	peak-to-peak	Langley
PP	Pilot Project	CASI
PP	Planetary Programs	CASI
PP	Plasma Protein	CASI
PP	Polypeptide	CASI
PP	Polypropylene	CASI
PP	Pounds Pressure	CASI
PP	Project Plan	Goddard
PP	Propulsion Power	CASI
PP	Proton Proton	CASI
P-P	Peak-to-Peak	Goddard
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PPC	Policy and Planning Committee	Goddard
PPC	Procurement Placement Code	Goddard
PPCD	Programmable Platforms for Collection of Data	CASI
PPCU	Port Power Conditioning Unit	Goddard
PPD	Physical Page of Data	Goddard
PPDD	Plan Position Data Display	CASI
PPE	Pay Period Ending	Langley
PPE	Personal Protective Equipment	CASI
PPE	Phase Partitioning Experiment	CASI
PPF	Payload Processing Facility	Goddard
PPF	Positive Position Feedback	CASI
PPG	Picopicogram (10240 grams)	CASI
PPI	Plan Position Indicator	CASI
PPL	Polar Plasma Laboratory (Satellite in the OPEN program)	CASI
PPL	Preferred Parts List	Goddard
PPLU	Propellant and Pressurant Loading Unit	Goddard
PPM	Parts per Million	Langley
PPM	Pulse Position Modulation	CASI
PPMD	Polished Plate Meteroid Detector	Langley
PPMI	Program Project Management Initiative (OHR)	Langley
PPMI	Program/Project Management Initiative	Goddard
PPMU	Portable Propulsion Monitor Unit	Goddard
PPO	Proposal Production Office	Goddard
PPP	Projected Promotion Potential	Goddard
PPR	Pathfinder Planetary Rover	CASI
PPR	Photopolarimeter/Radiometer (Galileo Spacecraft)	CASI
PPS	Pulses Per Second	CASI
PPSSCC	(Foundation for the) President's Private Sector Survey on Cost Control	Langley
PPSU	Propellant and Pressurant Servicing Unit	Goddard
PPT	Pulsed Plasma Thruster	Goddard
PPU	Pre-Production Unit	Goddard
PPU	Power Processing Unit (solar electric propulsion)	CASI
PQR	Procedure Qualification Record (Welding)	Langley
PQT	Preliminary Qualification Test	Goddard
PR	Precipitation Radar	CASI
PR	Problem Report	Goddard
PR	Procurement Request	Goddard
PR	Product Request	Goddard
PR	Purchase Request	CASI
PRA	Probabilistic Risk Assessment	Goddard
PRB	Problem Reporting Bulletin	Goddard
PRB	Program Review Board	Goddard
PRC	Passive Radiative Cooler	Goddard
PRC	Planer Random Composites (fiber reinforced composites)	CASI
PRCF	Plutonium Recycle Ceramic Fuel	CASI
PRCS	Primary Reaction Control System (Jet)	CASI
PRD	Preliminary Requirements Document	Goddard
PRD	Program Requirements Document	Goddard
PRD	Project Reference Data	Goddard
PREAMP	Preamplifier	Langley
Pre-MSR	Pre-Monthly Status Review	Goddard
PRF	Pulse Recurrence Frequency	CASI
PRIME	Primordial Explorer	Goddard
PRIS	Project Records Information System	CASI
PrISM	Program for Information Storage and Management	Langley
PRISMA	Probing Rotation and Interior of Stars: Microvariability and Activity	CASI
PRJU	Power Regulator Junction Unit	Goddard
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PRL	Program Requirements Logic	Goddard
PRL	Pulse Rebalance Loop	Goddard
PRL	6570th Personnel Research Lab., Aerospace Medical Div., Air Force Base, TX	CASI
PRM	Pulse Ratio Modulation	CASI
PRN Modulation	Pulse Ratio Noise Modulation	CASI
PROFAC	Propulsive Fluid Accumulator	CASI
PROM	Programmable Read Only Memory	CASI
PROMIS	Polar Regions Outer Magnetosphere International Study	CASI
PROTO	Prototype	Langley
PRR	Preliminary Requirements Review	Goddard
PRR	Program Requirements Review (NASA)	Langley
PRR	Pulse Repetition Rate	Goddard
PRS	Payload Retention System	Goddard
PRS	Performance Requirement’s Summary	Goddard
PRS	PORTS Refurbishment System	Goddard
PRSDS	Power Reactant Storage and Distribution System	CASI
PRT	Platinum Resistance Thermometer	Goddard
PRT	Power Ratchet Tool	Goddard
PRTR	Plutonium Recycle Test Reactor	CASI
PS	Payload Specialist	CASI
PS	Payload Station	Goddard
PS	Post Script	Goddard
PS	Power Supply	Goddard
PS	Process Specification	Goddard
PS	Program Support	Langley
PS	Project Scientist	Goddard
PS	Propulsion Subsystem	Goddard
PSA	Power Section Assembly	CASI
PSA	Provision Stowage Assembly	CASI
PSAS	Phenytoin for Space Adaptation Syndrome	CASI
PSAT	Predicted Site Acquisition Table	Goddard
PSB	Persistent Slip Band	CASI
PSB	Power Supply Board	Goddard
PSC	Performance Seeking Control	CASI
PSC	Platform Support System	CASI
PSC	Polar Stratospheric Clouds	CASI
PSCM	Product Structure Configuration Management	Goddard
PSCN	Proposed Specification Change Notice	Goddard
PSCN	Program Support Communications Network	CASI
PSD	Power Spectral Density	Goddard
PSD	Pulse Shape Discriminator	Goddard
PSDU	Power Switching and Distribution Unit	Goddard
PSE	Parabolized Stability Equations	CASI
PSE	Physiological Systems Experiment	CASI
PSE	Power Supply Electronics	Goddard
PSE	Power System Electronics	Goddard
PSE	Power System Equipment	Goddard
PSE	Project Systems Engineer	Goddard
PSEA	Payload Safing and Electronics Assembly	Goddard
PSEA	Pointing and Safemode Electronics Assembly	Goddard
PSF	Point Spread Function	Goddard
PSI	Paul Scherrer Institute	CASI
PSI	PI Scientific Instrument	Goddard
PSI	Pounds per Square Inch	Langley
psi	pounds per square inch	CASI
PSIL	Preferred Speech Interference Level	CASI
PSIOC	Processor Support and I/O Controller	Goddard
PSK	Phase Shift Keying	Goddard
PSK	PhaseShiftKeyed (modulation)	CASI
PSL	Physical Science Laboratory (at New Mexico State University)	Langley
PSL	Propulsion Systems Laboratory	CASI
PSLA	Project Service Level Agreement (SOMO)	Goddard
PSM	Project Safety Manager	Goddard
PSM	Project Support Manager	Goddard
PSMIR	Performance Specification and Mission Implementation Requirements	Goddard
PSNSML	Material Labs, Puget Sound Naval Shipyard, Bremerton, WA	CASI
PSP	Payload Signal Processor (Space Shuttle)	CASI
PSP	Performance Surveillance Plan	Goddard
PSP	Pressure Sensitive Paints	Langley
PSR	Precision Segmented Reflector	CASI
PSR	Preliminary Science Review	Goddard
PSR	Pre-Shipment Review	Goddard
PSR	Program Status Review	Goddard
PSR	Project Status Review	Goddard
PSRP	Payload Safety Review Panel	Goddard
PSRR	Preliminary System Requirements Review	Goddard
PSS	Payload Safing Sequence	Goddard
PSS	Portable Spacecraft Simulator	Goddard
PSSD	Position Sensitive Silicon Detectors	Goddard
PSSIG	Parallel Systems Special Interest Group	Langley
PST	Pacific Standard Time	CASI
PST	Process Systems Team	Langley
PSTOL	PORTS Systems Test and Operation Language	Goddard
PSU	Penn State University	Goddard
PSU	Pennsylvania State University	Goddard
PSU	Power Supply Unit	Goddard
PSWG	Payload Safety Working Group	Goddard
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PT	Project Technologist	Goddard
PTEC	Plastics Technical Evaluation Center, Picatinny Arsenal, Dover, NJ	CASI
PTF	Payload Test Facility	Goddard
PTF	Payload Training Facility	CASI
PTFE	PolyTetraFluoroEthylene	CASI
PTM	Proof Test Model	CASI
PTM	Pulse Time Modulation	CASI
PTM	Pulse Time Multiplex	CASI
PTO	Patent and Trademark Office	Goddard
PTP	Programmable Telemetry Processor	Goddard
PTR	Program Trouble Report	Goddard
PTS	Permanent Threshold Shift	CASI
PTZ	Pan/Tilt/Zoom	CASI
PU	Propellant Utilization	CASI
PU	Prototype Unit	Goddard
PUCK	Propellant Utilization Checkout Kit	CASI
PUD	Pop-Up Detector	Goddard
PUR	Payload Under Review	CASI
PURL	Permanent Universal Resource Locator	CASI
PUVEP	Propellant Utilization Vehicle Electronic Package	CASI
PV	Photovoltaic	CASI
PV	Photo-Voltaic	Goddard
PV	Potential Vorticity	CASI
PV&D	Purge, Vent & Drain	CASI
PVC	Polyvinylchloride or Polyvinyl chloride	CASI
PVD	Parametric Drive Voltage	Goddard
PVD	Plain View Display	CASI
PVM	Parallel Virtual Machine	Langley
PVOR	Precision Very High Frequency Omnidirectional Range (VOR)	CASI
PVT	Physical Vapor Transport	CASI
PVT	Position, Velocity, and Time	Goddard
PVT	Pressure, Velocity, and Temperature	CASI
PVT	Production Validation Test	CASI
PVTOS	Physical Vapor Transport of Organic Solids	CASI
PW	Precipitable Water	Goddard
PW	Pulse Width	Goddard
PWA	Printed Wiring Assembly	Goddard
PWA	Project Work Authorization	Goddard
PWB	Precipitable Water Vapor	Goddard
PWB	Printed Wiring Boards	CASI
PWBS	Project Work Breakdown Structure	Goddard
PWD	Printed Wiring diagram	Goddard
PWFA	Plasma Wakefield Accelerator	CASI
PWG	Project Working Group	Goddard
PWI	Pilot Warning Indicator (Related to CAS Collision Avoidance System)	CASI
PWI	Proximity Warning Instrument;	CASI
PWIA	Plane Wave Impulse Approximation	CASI
PWL	Power Watt Level (Acoustic units of measurement, sound power level)	CASI
PWLA	Portable Work Light Assembly	Goddard
PWM	Pulse Width Modulation	CASI
PWR	Pressurized Water Reactor	CASI
PWS	Performance Work Statement	Goddard
PY	Prior Year	Goddard
PY	Program Year	Goddard
PYRO	Pyrotechnic	Langley
PZT	Lead Zirconate Titanate	CASI
PZT	Piezoelectric Transducer	Goddard
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