Prostate Specific Antigen 
Public Service Announcement 
Post Shakedown Availability 
Port Support Activity 
Principal Staff Assistant 
Probabilistic Safety Assessment 
Problem Statement Analyzer 
Professional Services Automation 
Public Service Agreement 
Pressure Switch Assembly 
Pacific Science Association 
Payload Support Avionics 
Power Servo Amplifier 
Power Servo Assembly 
Pressure Sensitive Adhesive 
Pressure Swing Adsorption 
probabilistic safety analysis 
Probe Support Avionics 
Product Safety Association 
prostate-specific antigen 
Protected Service Area 
Payload Service Area 
Personnel Support Activity 
phase shift analysis 
Pipeline Safety Act 
Pisum sativum agglutinin 
Point of Service Activation 
Polysilicon Self-Aligned 
Portfolio Systems Acquisition 
Post-Sleep Activity