| Acronym | Meaning |
 | PFRT | Preliminary Flight Rating Test |
| PFRX | Preflight Relmat (X- 1 |
| PFS | Percent Full Scale |
| PFS | Primary Flight System |
| PFTA | PaY[oad Flight Test Article |
| PG | Power Generation |
| PG | Pressure Gage |
| PGA | Power Generating Assembly |
| PGA | Pressure Garment Assembly |
| PGA | Programmable Gain Amplifier |
| PGDCS | Power Generation |
| 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 | Hydrogen-Ion Concentration (Alkalinity) |
| PH | Personal Hygiene |
| PH | Phase |
| PHA | Preliminary Hazard Analyses |
| PHF | Payload Handling Fixture |
| PHF | Personal Hygiene Facility |
| 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 |
| PI | PaYload Interrogator |
| PI | Pen And Ink (Document Update) |
| PI | Preliminary Investigation |
| PI | Principal Investigator |
| PI | Procurement Item |
| PI | Program Introduction |
| PIA | Preinstallation Acceptance |
| PIA | Project Impact Analysis |
| PIAR | Project Impact Analysis Report |
| PIB | Pyrotechnic Installation Building |
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