| Acronym | Meaning |
| PIPA | Pulse Integrating Pendulum Accelerometers |
| MDCS | Material Data Collection System |
| HFMU | High Fidelity Mockup |
| ICAO | International Civil Aviation Organization |
| CSF | Cost Sensitivity Factor |
| SPA | Signal Processor Assembly |
| HD | Horizontal Drain |
| RTCE | Rotation/Translation Control Electronics |
| OBCS | Onboard Checkout Subsystem |
| RPA | Record And Playback Assembly |