| Acronym | Meaning |
 | SSSS | Space Shuttle System Specification |
| SSO | Safety Signification Operation |
| LAT | Latitude |
| ORD | Orbital Requirements Document |
| STS | Space Transportation System |
| OBS | Operational Biomed Sensors |
| SPAS | Shuttle Pallet Satellite (German) |
| MATCO | Materials Analysis |
| CTU | Central Timing Unit |
| TSC | Test Setup Complete |
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