Public Affairs 
Privacy Act 
Public Address 
Power Amplifier 
Physician Assistant 
Performance Assessment 
Preliminary Assessment 
Palestinian Authority 
Personal Author 
Program Announcement 
Physicians Assistant 
Process Area 
position angle 
probability of arrival 
Pad Abort 
Pascal 
per annum 
Preparing Activity 
private account 
Product Assurance 
Property Administrator 
protected area 
Purchasing Agent 
Passenger Address 
Pennsylvania 
posterior-anterior 
Power of Attorney 
Program Authorization 
Programmatic Agreement 
Pulmonary atresia