| Acronym | Meaning |
 | SEC | Source Evaluation Committee |
| M50 | Mean Of 1950 (Coordinate System) |
| T/L | Transformer Load |
| LEO | Low Earth Orbit |
| SSID | Shuttle Stowage Installation Drawing |
| ACTS | (TOS) Advanced Communications Technology Satellite |
| SOL | Solar |
| ILC | Initial Launch Capability |
| R/T | Receiver/Transmitter |
| OFDS | Orbiter Flight Dynamics Simulator |
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