| 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 |