| Acronym | Meaning |
| OISR | Open Item Status Report |
| PFB | Pressure Fed Booster |
| TAO | Trans-Atlantic Abort |
| ISPM | International Solar Polar Mission |
| SRM | SPecification Requirements Manual |
| VAST | Versatile Avionics System Tester |
| TVCS | Thrust Vector Control System |
| MU | Master Unit |
| NPN | NASA Part Number |
| STADU | System Termination And Display Unit |