Did you ever wonder what those strange conglomerations of letters meant? Here's your chance to find out what those NASA acronyms stand for. About Space and Astronomy presents the Guide to NASA Acronyms. From Pulse Modulation to Payload Ground Support Systems and Payload Handling to Payload Operations Center, you'll find them here. This page lists acronyms starting with P. For others, click on the appropriate letter above or below.

[P]

P&FS: Particles and Fields Subsatellite
P&I: Performance and Interface (Specification)
P&M: Pulse Modulation
P&M: Processes and Materials
P&M: Planetary Mission
P&M: Preventive Maintenance
P&M: Program Milestone
P&M: Performance Monitor
P&M: Phase Modulation (Modulated)
P&R: Performance and Resources
P&SM: Procurement and Subcontract Management
P-P: Peak-to-Peak (Value)
P-TUBE: Pneumatic Tube
P/A: Problem Analysis
P/B: Pushbutton
P/B: Preburner
P/C: Pitch Control
P/L: Payload
P/L: Postlanding
P/L: Parts List
P/L: Purchased Labor
P/N: Part Number
P/P: Patch Panel
P/P: Printer/Plotter
P/PL: Primary Payload
P/S: Payload Specialist
P/S: Parallel to Serial Converters
P/Y: Pitch/Yaw
PA: Pad Abort
PA: Paging and Area Warning
PA: Power Amplifier
PA: Product Assurance
PA: Public Address
PA: Public Affairs
PA: Pulse AmPlifier
PAC: Pressure Alpha Center
PAC: Probe Aerodynamic Center
PAC: Problem Action Center
PACAS: Personnel Access Control Accountability System
PACC: Problem Action Control Center
PACE: Prelaunch Automatic Checkout Equipment
PACS: Pointing and Attitude Control System
PAD: Preliminary Advisory Data (Crew Data Uplink)
PAD: Program Approval Document
PAD: Propellant Acquisition Device
PAE: Problem Assessment Engineer
PAE: Preventive Action Engineer
PAF: Peak Annual Funding
PAF: Payload Attach Fitting
PAF: Payload attach fitting
PAFB: Patrick Air Force Base
PAH: PaYload Accommodations Handbook
PAL APA: Indonesian Communications Satellite
PALS: Photo Area and Location SYstem
PALS: Precision Approach and Landing SYstem
PAM: Pulse Amplitude Modulation
PAM: Payload Assist Module
PAM: Pulse Amplifier Modulation
PAM: Payload assist module
PAM-A: "PAM, Atlas-Centaur Class Spacecraft"
PAM-D: "PAM, Delta Class Spacecraft"
PAMB: Pressure Ambient
PAO: Public Affairs Office (Officer)
PAP: Product Assurance Plan
PAPI: Precision Approach Path Indicator
PAR: Product Acceptance Review
PAR: Problem Action Record
PAR: Precision Approach Radar
PAR: Planning Action Request
PAR: Problem Action Request
PAR: Problem Accountability Record
PARA: Paragraph
PARAM: Parameter
PARS: Property Accountability Record System
PAS: Primary Ascent System
PAS: Payload Accommodation Studies
PASS: Primary Avionics Software System
PASS: Planning and Scheduling System
PASS: Primary avionics software system
PAT: Production Acceptance Test
PAT: Problem Action Team
PATP: Preliminary Authority To Proceed
PATS: Program for Analysis of Time Series
PAU: Probe Aerodynamic Upper
PAV: Pressure Actuated Valve
PAX: Passengers
PAYCOM: Payload Command
PAYDAT: Payload Data
PB: Playback
PB: Preburner (P/B preferred)
PB: Pushbutton
PB: Phonetically Balanced
PB: Playback
PBAN: Polybutadiene Acrylonitrile (Propellant)
PBD: Payload Bay Door
PBDF: Payload Bay Door FWD
PBDM: Payload Bay Door Mechanism
PBI: Push Button Indicator
PBI: Push button indicator
PBIC: Programmable Buffer Interface Card
PBIM: Programmable Buffer Interface Module
PBK: Payload Bay Kit
PBL: Payload Bay Liner
PBM: Program Business Management
PBPS: Post-Boost Propulsion System(s)
PBS: Protective breathing system
PBW: Proportional Band Width
PC: Pulsating Current
PC: Plane Change
PC: Printed Circuit (Card)
PC: Chamber Pressure
PC: Pitch Control
PC: Project Control
PCA: Power Control Assembly
PCA: Point of Closest Approach
PCA: Pitch Control Assembly
PCA: Pneumatic Control Assembly
PCA: Power controller assembly
PCA: Pneumatic control assembly
PCB: Power Circuit Breaker
PCB: Product Configuration Baseline
PCB: Printed Circuit Board
PCB: Power Control Box
PCC: Pad Control Center
PCC: Payload Control and Checkout
PCC: Production Control Centers
PCCB: Program Configuration Control Board
PCCE: Payload Common Communication Equipment
PCCM: Program Change Control Management
PCCN: Provisioning Contract Control Number
PCCP: Preliminary Contract Change ProPosal
PCD: Procurement Control Document
PCDU: Payload Command Decoder Unit
PCEM: Propulsion Contamination Effects Module
PCF: Payload Control Facility
PCG: Phonocardiogram
PCI: Product Configuration Identification
PCI: Procedure Change Unit
PCI: Program Control Input
PCI: Peripheral Controller Interface
PCIL: Pilot-Controlled Instrument Landing
PCIN: Program Change Integration
PCIN: Program Change Identification Number
PCL: Primary Coolant Loop
PCL: Pallet Coolant Loop
PCL: Power Control List
PCL: Primary Coolant Line
PCL: Programming Check List
PCM: Pulse Code Modulation
PCM: Power Control Mission
PCM: Punch Card Machine
PCM: Pulse Code Modulator
PCM: Pulse code modulation
PCM E: Pulse-Code Modulation Event
PCMD: "Pulse-Code Modulation, Digital"
PCMMU: Pulse-Code Modulation Master Unit
PCMMU: PCM Master Unit
PCMMU: Pulse code modulation master unit
PCMS: Pulse-Code Modulation Shared
PCN: Program Change Notice
PCN: Program Control Number
PCN: Page Change Notice
PCO: Postcheckout operations
PCO: Program Controlled Output
PCO: Procuring Contracting Officer
PCO: Postcheckout
PCOT: Payload Center Operations Team
PCP: Project Change Proposal
PCP: Project Cost Plan
PCP: Power Control Panel
PCP: Program Change Proposal
PCR: Payload Checkout Room
PCR: Payload Changeout Room
PCR: Publication Change Request
PCR: Project Control Room
PCR: Program Change Request
PCR: Power Change Request
PCR: Payload changeout room
PCRB: Operations)
PCRB: Program Change Review Board (RI Launch
PCS: Pointing Control System
PCS: Primary Coolant System
PCS: Pressure Control System
PCS: Payload Control Supervisor
PCS: Payload Checkout System
PCS: Power Conversion System
PCS: Procedure Completion Sheet
PCT: Percent
PCTE: Portable Commercial Test Equipment
PCTO: Payload Cost Tradeoff Optimization
PCTR: Pad connection terminal room
PCU: Payload Checkout Unit
PCU: Power Control Unit
PCU: Pressure Control Unit
PCU: Process Control Unit
PCV: Precheck Verification
PCV: Purge Control Valve
PCVB: Pyro Continuity Verification Box
PCVL: Pilot Controlled Visual Landing
PCZ: Physical Control Zone
PD: Propellant Dispersal
PD: Project Directive
PD: Program Directive
PD: Procurement Drawing
PD: Procurement Document
PD: Preliminary Design
PD: Pitch Down
PD&RS: Payload Deployment and Retrieval Subsystem
PDA: Propellant Drain Area
PDAR: Program Description and Requirements
PDB: Power Distribution Box
PDB: Performance Data Book
PDC: Procurement Document Change
PDC: Predefined Command
PDCR: Proprietary Data Control Record
PDCS: Power Distribution and Control System (Subsystem)
PDF: Pocket dosimeter FEMA
PDH: Pocket Dosimeter-High
PDH: Pocket dosimeter high
PDI: Payload Data Interleaver
PDI: Payload DePloyment and Retrieval System
PDL: Pocket Dosimeter-Low
PDL: Procedure Distribution List
PDL: Program Design Language
PDL: Pocket dosimeter low
PDM: Processor Data Monitor
PDM: Pulse Duration Modulation
PDM/FM: Pulse Duration Modulation/Frequency Modulation
PDP: Project Definition Phase
PDP: Plasma Diagnostics Package
PDP: Postinsertion Deorbit Preparation
PDP: Preliminary Definition Plan
PDP: Procurement Data Package
PDP: Program Development Plan
PDR: Preliminary Data Requirements
PDR: Preliminary Design Review
PDR: Processed Data Recorder
PDR: Program Design Review
PDR: Program Director's Review
PDRD: Procurement Data Requirements Document
PDRL: Procurement Data Requirements List
PDRM: Payload Deployment and Retrieval Mechanism
PDRS: Payload Deployment and Retrieval System(s)
PDRS: Payload Data and Retrieval System
PDRS: Payload deployment and retrieval system
PDRSS: Payload Development and Retrieval System Simulator
PDRSTA: Payload Deployment and Retrieval System Test Article
PDS: Power Distribution System (Subsystem)
PDS: Package Data System
PDS: Partitioned Data Set
PDS: Problem Data System
PDU: Pilot Display Unit
PDU: Power Drive Unit
PDU: Pressure Distribution Unit
PDU: Pulse Detection Unit
PDU: Power drive unit
PDV: Pressure Disconnect Valve
PE: Project Engineer
PEAP: Personal egress air pack
PEB: Performance Evaluation Board
PED: Pedal
PED: Pedestal
PEFO: Payload Effects Follow-on Study
PEG: Powered explicit guidance
PEIR: Project Equipment Inspection Record
PEM: Plant Engineering and Maintenance
PEN: Penicillin
PEP: Power Extension Package
PER: Perigee
PER: Period
PER: Preliminary Engineering Report
PERF: "Perform, Performance"
PERM: Permanent
PERT: Program Evaluation Review Technique
PET: Phase Elapsed Time
PETA: Performance Evaluation and Trend Analysis
PETB: Preflight Test Bus
PETN: Petaerythrite Tetranitrate
PETS: POCC Experiments Timeline System (GDSD and Spacelab
PETS: P/L Experiment Test System (KSC)
PETS: Payload Environmental Transportation System
PF: Payload Forward
PF: Payload Operational Instrumentation MDM-FWD
PF: Parachute Facility
PF: Payload Function
PF: Power Factor
PF: Powered Flight
PF: Preflight
PF: Prime Function
PF: Probability of Failure
PF: Pulse Frequency
PFA: Palmdale Final Assembly
PFB: Pressure Fed Booster
PFB: Position Feedback
PFB: PaYload Forward Bus
PFB: Payload Feedback
PFC: Preliminary Flight Certification
PFC: Performance Flight Certification
PFC: Postflight Checklist
PFC: Power Factor Corrector
PFCF: Payload Flight Control Facility
PFCS: Primary Flight Control System
PFK: Payload Function Key
PFL: Primary Freon Loop
PFM: Pulse Frequency Modulation
PFM: Platform
PFP: Prograin Financial Plan
PFP: Programmable Function Panel
PFR: Portable Foot Restraint
PFRT: Preliminary Flight Rating Test
PFRX: "Preflight Relmat (X- 1,2,3 ... 9 or A,B,C. . Z)"
PFS: Primary Flight System
PFS: Percent Full Scale
PFTA: PaY[oad Flight Test Article
PG: Pressure Gage
PG: Power Generation
PGA: Power Generating Assembly
PGA: Pressure Garment Assembly
PGA: Programmable Gain Amplifier
PGDCS: "Power Generation, Distribution, and Control"
PGDCS: Subsystem
PGE: Purge
PGHM: Payload Ground Handling Mechanism
PGHM: Payload ground handling mechanism
PGM: Program (able)
PGNCS: Primary G&N and Control System (Subsystem)
PGOR: Payload Ground Operation Requirements
PGORS: Payload Ground Operations Requirements Study
PGR: SPacelab Planning and Ground Rule
PGRWG: Payload Ground Requirements Working Group
PGS: Power Generation Subsystem
PGSE: Payload Ground Support Equipment
PGU: Plant Growth Unit
PGWG: Particles and Gasses Working Group
PH: Personal Hygiene
PH: Phase
PHA: Preliminary Hazard Analyses
PHF: Personal Hygiene Facility
PHF: Payload handling fixture
PHK: Personal Hygiene Kit
PHM: Per Hundred Million
PHMC: Probe Heater Motor Controller
PHOTO: Photograph
PHP: Payload Handling Panel
PHR: Payload Hazardous Report
PHS: Payload Handling Station
PHSF: Payload Hazardous Servicing Facility
PI: Payload interrogator
PIA: Project Impact Analysis
PIA: Preinstallation Acceptance
PIAR: Project Impact Analysis Report
PIB: Pyrotechnic Installation Building
PIC: Programmable Interval Clock
PIC: Preinstallation Checkout
PIC: Payload Integration Committee
PIC: Pyro Initiator Capacitors
PIC: Pyro Ignition Control
PIC: Pyro Initiator Controller
PIC: Pyrotechnic Initiator Controller
PIC: Payload Integration Center
PIC: Pyro initiator controller
PICP: Program Interface Control Plan
PICRS: Program Information Coordination and Review
PICRS: Service
PICRS: Program Information Control and Retrieval System
PICS: Predefined Input Control Sequence
PICS: Photo Index and Cataloging System
PID: Payload Insertion Device
PID: Program Information Document
PID: Program Introduction Document
PIDA: Payload Installation and Deployment Aid
PIDS: Portable Image Display System
PIE: P/L Integration Equipment
PIECP: Preliminary Impact Engineering Change Proposal
PIF: Payload Integration Facility
PIGA: Pendulous Integrating Gyro Accelerometer
PIIN: Procurement Instrument Identification Number
PIM: Pulse Interval Modulation
PIND: Particle Impact Noise Detection
PIO: Payload Integration Plan
PIO: Pilot-Induced Oscillation
PIO: Public Information Office
PIP: Payload Integration Plan
PIP: Payload Interface Plan
PIP: Plant Instrumentation Program
PIP: Production Instrumentation Package
PIP: Project Implementation Plan
PIPA: Pulse Integrating Pendulum Assembly
PIPA: Pulse Integrating Pendulum Accelerometers
PIRN: Preliminary Interface Revision Notice
PIT: Preinstallation Test
PITG: Payload Integration Task Group
PITS: Payload Integration Test Set
PIU: Power Interface Unit
PIU: Pyrotechnic Initiator Unit
PIV: Peak Inverse Voltage
PK: Peak (Valve)
PK/PK: Peak to Peak
PKD: Programmable Keyboard and Display
PKG: Package
PKM: Perigee Kick Motor
PKT: Pocket
PL: Postlanding (P/L preferred)
PL: Prelaunch
PL: Plate
PL: Plug
PL: Payload (P/L preferred)
PL: Payload
PL/SNSR: Payload Sensor
PLA: Parachute Location Aid
PLACE: Position Location Aircraft Communications
PLACE: Equipment
PLAT: Platform
PLB: Payload Bay
PLB: Payload bay
PLBD: Payload BaY Door(s)
PLBK: Playback (PB preferred)
PLD: Program Listing Document
PLDI: Payload Data Interleaver
PLDM: Payload Management
PLDS: Payload Support
PLGSS: Payload Ground Support Systems
PLH: Payload Handling
PLI: Payload Interrogator
PLISN: Provisioning List Item Sequence Number
PLL: Phase Locked Loop
PLM: Payload Management
PLM: Payload Monitoring
PLMS: Program Logistics Master Schedule
PLN: Plan
PLN: Program Logic Network
PLRD: Payload Requirements Document
PLRV: Payload Launch Readiness Verification
PLS: Propellant Loading System
PLS: Payload Systems
PLS: Post Landing and Safing
PLS: Preliminary Landing Site
PLS: Primary Landing Site
PLSL: Propellants and Life Support Laboratory
PLSP: Payload Signal Processor
PLSP: Payload signal processor
PLSS: Portable Life Support Subsystem
PLSS: Primary Life SuPport Subsystem
PLSS: Portable life support system
PLT: Pilot
PLTS: Precision Laser Tracking System
PLUM: Payload Umbilical Mast
PLV: Postlanding Vent
PLVC: Postlanding Vent Control
PM: Preventive Maintenance
PM: Project Manager
PM: Payload Management
PM: Performance Monitor
PM: Phase Modulation
PM: PMAT Page Map Address Table
PM: Payload Midbody
PM: Pulse Modulation
PM: PMA Performance Monitor Annunciator
PM: PMAD Performance Monitor Annunciation Driver
PM: Power Management and Distribution
PM: PMAP Performance Monitor Annunciation Panel
PM: "Phase modulation, phase modulated"
PMC: Procurement Method Code
PMC: Payload Monitoring and Control
PMC: Plutona-Molybdenum Cermet
PMC: Postmanufacturing Checkout
PMC: Private Medical Communication
PMD: Palmdale (TACAN Station)
PMD: "PMDL Palmdale, California"
PMEL: Precision Measurements Equipment Laboratory
PMF: Performance Monitor (Monitoring) Function
PMF: Perigee Motor Firing
PMF: Program Management Facility
PMHL: Preferred Measurement Hardware List
PMI: Preventive Maintenance Inspection
PMI: Preventive Maintenance Instruction
PMI: Principal Maintenance Inspector
PMIA: Parallel Multiplexer Interface Adapter
PMIR: Program Manager's Integration Review
PMIS: Personnel Management Information System
PML: Preliminary Materials List
PMM: Property Management Manual
PMN: Program Management Network
PMOM: Performance Management Operations Manual
PMON: Performance Management Operations Network
PMP: Premodulation Processor
PMP: Performance Management Package
PMP: Pump
PMP: Program Management Plan
PMP: "Parts, Materials, and Processes"
PMPL: Preferred Mechanical Parts List
PMR: Performance Measurement Report
PMR: Program Manager's Review
PMS: Performance Monitoring System
PMS: Performance Management System
PMS: Performance Measurement System
PMT: Production Monitoring Test
PMT: Planning/Management Team
PMTC: Pacific Missile Test Center
PMU: Pulse Modulation Unit
PMU: PCM Master Unit
PMU: Pressure Measuring Unit
PN: Part Number (P/N preferred)
PN: Pseudo Noise
PN: Pseudo-Random Noise
PNEU: Pneumatic
PNL: Panel
PNP: Prenegotiation Position
PO: Personnel Office (KSC Directorate)
PO: Postorbit
PO: Purchase Order
POA: Plan of Action
POCC: Payload Operations Control Center
POCC: Payload Operations Control Center
POCN: Purchase Order Change Notice
POD: Payload Operations Division (JSC)
POE: Proximity OPticai Device
POGO: Polar Orbiting GeophYsical Observatory
POGO: P090 Suppression System
POGO: Pilot Operational EquiPment
POI: Propellant Quantity Indicator
POI: Product of Inertia
POL: "Petroleum, Oil, and Lubricants"
POLAR: Production Order Location and Reporting
POM: Pallet-Only Mode
POM: Printer OutPut Microfilm
POMT: Planning Operations Management Team
POP: Program Operating Plan
POP: Perpendicular-to-Orbit Plane
POP: Preburner Oxidizer Pump
POP: Preflight Operations Procedures
POP: Prelaunch Operations Plan
POPA: PaYload Ordnance Processing Area
POPU: Push Over Pull Up
POR: Purchase Order Request
POR: Point of resolution
PORB: Production Operations Review Board
PORCN: Production Oi-der Records Change Notice
PORD: Performance and 0iperations Requirements Document
PORR: Preliminary Operat ons Requirements Review
PORT: Portable
POS: Pacific Ocean Ship
POS: Position
POS: Portable Oxygen System
POS: Portable oxygen system
POST: Program to OPtimize Simulated Trajectories
POST: Positive
POST: Payload Operations SuPport Team
POT: Potentiometer
POT: Potable
POV: Pneumatic Operated Valve
POV: Peak Operating Voltage
POWS: Project Operating Work Statement
PPB: Program Performance Baseline
PPB: Parts per Billion
PPC: Phased Provisioning Code
PPC: PreProcessing Center
PPCO2: Partial Pressure CO2
PPEP: Plasma Physics and Environmental Perturbation
PPF: Payload Processing Facility (USAF)
PPH: Pounds per Hour
PPI: Plan Position Indicator
PPI: Pulse Position Indicator
PPIL: Priced Provisioned Item List
PPL: Provisioning Parts List
PPL: Priced Parts List
PPL: Planning Parts List
PPM: Parts per Million
PPM: Part per Minute
PPM: Pulse per Minute
PPM: Pulse Position Modulation
PPM E: Pacific Plate Motion Experiment
PPO2: Partial Pressure 02
PPO2: Oxygen partial pressure
PPP: Payload patch panel
PPR: Payload Preparation Room
PPS: Pneumatic Power Subsystem
PPS: Printer/Plotter System
PPS: Provisioning Performance Schedule
PPS: Pulse Per Second
PQGS: Propellant Quantity Gaging System
PR: Procurement Requisition
PR: Pressure Regulator
PR: Procurement Regulation
PR: Purchase Request
PR: Pressure
PR: Pulse Rate
PR: Problem Report
PR: Pressure Ratio
PR: Primary
PR: Position Record
PR: Pair
PR: Performance Report
PRACA: Problem Reporting and Corrective Action
PRB: Parachute Refurbishment Building
PRB: Project Review Board
PRB: Paso Robles (TACAN Station)
PRB: Panel Review Board
PRC: People's Republic of China Satellite
PRC: People's Republic of China (Payload)
PRC: Planning Research Corporation
PRCA: Problem Reporting and Corrective Action
PRCB: Program Requirements Change Board
PRCB: Program Requirements Control Board
PRCB: Program Review Control Board
PRCBD: Program Requirements Control Board Directive
PRCBD: Program Review Control Board Directive
PRD: Program Requirements Documents (UDS)
PRD: Procurement Regulation Directive
PRD: Personal Radiation Dosimeter
PRD: Procurement Requirements Document
PRE: Personal Rescue Enclosure
PRE-MOD: Premodulation
PREAMP: Preamplifier
PREF: Preference
PREFLT: Preflight
PREL: Preliminary
PREP: Preparation
PREP: Prepare
PRES: Present
PRESS: Pressure
PRESS: Pressurant
PREV: Previous
PREVLV: Prevalve
PRF: Parachute Refurbishment Facility
PRF: Pulse Repetition Frequency
PRI: Primary
PRIM: Primary
PRL: Priority Rate Limiting
PRL: Page Revision Log
PRL: Priority rate limiting
PRM: Pulse Rate Modulation
PRM: Posigrade Rocket Motor
PRM: Payload Retention Mechanism
PRN: Program Release Notice
PRN: Pseudo-Random Noise
PRN: Pulse Range Navigation
PRO: Proceed
PROB: Problem
PROC: Procurement
PROC: Procedure
PROC: "Processor, Process"
PROG: Progress
PROG: Program
PROJ: Project
PROM: Programmable Read-Only Memory
PROM: Progammable read-only memory
PROP: Propulsion Engineer
PROP: Propulsion
PROP: Proportioning
PROP: Propellant
PROPLT: Propellant
PROX: Proximity
PRP: Personnel Reliability Program
PRPS: Programming Requirements Process Specification
PRR: Pulse Repetition Rate
PRR: Program Requirements Review
PRR: Parts Replacement Request
PRR: Preliminary Requirements Review
PRS: Personnel Rescue Service
PRS: Personnel Rescue System
PRS: Power Reactant System (Subsystem)
PRS: Payload Retention Subsystem
PRS: Primary Recovery Site
PRS: Primary Rescue Site
PRS: Precision Ranging System
PRS: Provisioning Requirements Statement
PRSD: Power Reactant Supply and Distribution
PRSD: Power Reactant Storage and Distribution
PRSD: Power reactant storage and distribution
PRSDS: Power Reactant Storage and Distribution System
PRSS: Problem Report Squawk Sheet
PRT: Pulse Repetition Time
PRTLS: Powered Return to Launch Site
PRV: Pressure Reduction Valve
PS: Payload Station
PS: Payload Support
PS: Power Supply
PS: Pressure Switch
PS: Prime Select
PS: Payload Specialist
PS: Parachute Subsystem
PS/FC: Power Supply/Fuel Cell
PSA: Pre/Post Sleep Activity
PSA: Preferred Storage Area
PSA: Pressure Switch Assembly
PSA: Provisions Stowage Assembly
PSA: Power Servo Assembly
PSA: Payload Support Avionics
PSA: Payload Service Area
PSA: Power Servo Am pl if ier
PSAC: Presidential Scientific Advisory Committee
PSC: Parallel Switch Control
PSC: Program Schedule Chart
PSCL: Propellant Systems Cleaning Laboratory
PSCN: Preliminary Specification Change Notice
PSD: Program Support Document
PSD: Power Spectral Density
PSD R: Planning and Scheduling Document Record
PSDP: Payload Station Distribution Panel
PSE: Payload Support Equipment
PSE: Peculiar Support Equipment
PSE: Payload Service Equipment
PSE: Payload Servicing Equipment
PSF: Processing and Storage Facility (ET)
PSF: Processing and Staging Facility (SRB)
PSFC: Power Supply/Fuel Cell
PSG: Power Subsystem Group
PSI: Power Static Inverter
PSIG: Propulsion Systems Integration Group
PSK: Phase Shift Keyed
PSL: Propellant Seal
PSL: Pressure Seal
PSM: Propellant Storage Module
PSM: Phase Sensitive Modulator
PSM: Pyro Substitute Monitor
PSOP: Payload Systems Operating Procedures
PSP: Project Schedule Plan
PSP: Program Support Plan
PSP: Payload Signal Processor
PSP: Payload Specialist Panel
PSP: Payload Support Plan
PSP: Payload signal processor
PSPA: Pressure Static Probe Assembly
PSPL: Priced Spare Parts List
PSR: Program Status Review
PSRD: Program Support Requirements Document
PSS: Propulsion Support System
PSS: Pad Safety Supervisor
PSS: Payload Specialist Station
PSS: Payload Support System
PSS: Propellant Supply Subsystem
PSSP: Payload Specialist Station Panel
PSST: Periodic Significant Scheduled Tasks
PSSU: Patch Survey and Switching Unit
PSU: Power Switching Unit
PSV: Planetary Space Vehicle
PSW: Program Status Word
PT: Advanced Planning and Technology Office (KSC Dir.)
PT: Pint
PT: Pitch Trim
PT: Point
PT: Pressure Transducer
PTA: Propulsion Test Article
PTA: Positest Analysis
PTA: Potential Toxic Area
PTB: Payload Timing Buffer
PTC: Portable Temperature Controller
PTC: Passive Thermal Control
PTC: Passive thermal control
PTC R: Pad Terminal Connection Room
PTCS: Passive Thermal Control Section
PTCS: Passive Thermal Control System
PTCS: "Planning, Training, and Checkout System"
PTCS: Propellant Tanking Computer System
PTD: Provisioning Technical Documentation
PTDDSS: PTD Data Selection Sheet
PTI: Preliminary Test Information
PTI: Programmed Test Input
PTIS: Program Test Input System
PTM: Pulse Time Modulation
PTMS: Precision Torque Measuring System
PTO: Participating Test Organizations
PTO: Power Test Operations
PTP: Point-to-Point Phone(s)
PTR: Preliminary Test Report
PTR: Printer
PTR: Program Trouble Report
PTS: Payload Transportation System
PTS: Payload Test Set
PTT: Push-to-Talk
PTT: Push to talk
PTV: Pathfinder Test Vehicle
PU: Propellant Unit
PU: Pickup
PU: Power Unit
PU: Propellant Utilization
PUB: Publication
PUCS: Propellant Utilization Control System
PUGS: Propellant Utilization and Gaging System
PUPO: Pull Up Push Over
PUSS: Pallet Utility Support Structure
PUV: Propellant Utilization Valve
PV: Prevalve
PV&D: "Purge, Vent, and Drain"
PVA: Preburner Valve Actuator
PVA: Propellant Valve Actuator
PVD: "Purge, Vent, Drain System"
PVR: Precision Voltage Reference
PVRD: "Purge, Vent, Repressurize, and Drain"
PVRO: Pyrotechnics
PVT: Preflight Verification Test
PVT: "Pressure, Volume, and Temperature"
PVT: Pressure/Volume/Temperature
PVT: Private
PVT: Pyrotechnic Verification Test
PVWA: Planned Value of Work Accomplished
PVWS: Planned Value of Work Scheduled
PW: Pulse Width
PWA: Private Write Area
PWA: Pratt and Whitney Aircraft
PWA: Product Work Authorization
PWB: Printed Wire Board
PWBS: Program Work Breakdown Structure
PWM: Pulse-Width Modulation
PWMD: Printed Wiring Master Drawing
PWR: Power
PWS: Pricing Work Statement
PYRO: Pyrotechnics
Pc: Chamber pressure
Perigee Al: Perigee Altitude
Pi: Procurement Item
Pi: Program Introduction
Pi: PaYload Interrogator
Pi: Pen and Ink (Document Update)
Pi: Principal Investigator
Pi: Preliminary Investigation
Pil: Procurement Instrument Identification
Poc: Purchase Order Closeout
Poc: PaYload Operations Center

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