Program Commit Agreement Physical Configuration Audit Program Commitment Agreement Principal Component Analysis Proportional Counter Array Patient Controlled Analgesia Portland Cement Association printed circuit assembly Performance and Coverage Analyzer Physical Configuration Audits Polar Cap Absorption Policy Creation Authority Power Calibration Area Power Control Assembly Progressive Corrective Action Paid Claims Accuracy Password Call Acceptance Permanent Change of Assignment Pneumatic Control Assembly point of closest approach Policy Certification Authority Pool critical assembly Positive Control Area Principal Components Analysis Principle Component Analysis Parallel Channel Adapter Parts Control Area Payload Clamp Assembly Payload Control Area Permanent Court of Arbitration