| Acronym | Meaning |
| D | Down |
| GR | Ground R@le |
| SIL | Systems Integration Laboratory |
| ITO | Integration And Test Order |
| PR | PositionRecord |
| SOPC | Shuttle Operations Planning Complex |
| SSMECA | SSM E Controller Assembly |
| GA&CS | Ground Acquisition And Command Station |
| MTE | Maintenance Test Equipment |
| PGSE | Payload Ground Support Equipment |