| Abbreviation | Definition |
|---|---|
| PBDM | Payload Bay Door Mechanism |
| PBG | Planned Breathing Gear |
| PBI | Push Button Indicator |
| PBIC | Programmable Buffer Interface Card |
| PBIM | Programmable Buffer Interface Module |
| PBK | Payload Bay Kit |
| PBL | Payload Bay Liner |
| PBM | Power Balance Model |
| PBM | Program Business Management |
| PBMA | Process-Based Mission Assurance |
| PBP | PreBurner Pump |
| PBPS | Post-Boost Propulsion System |
| PBS | Point Based Safelists |
| PBS | Protective Breathing System |
| PBW | Proportional Band Width |
| PC | Pitch Control |
| PC | Plane Change |
| PC | Planetary Camera |
| PC | Pressure Chamber |
| PC | Printed Circuit |