| Acronym | Meaning |
 | RJD | Reaction Jet Device |
| MSE | Medical Support Equipment |
| MSL | Mean Sea Level |
| SIMS | Shuttle Inventory Management System |
| PPM | Pulse Position Modulation |
| IP | Identification Of Position |
| FUO | Follow-up Output |
| NAP | Navigation Analysis Program |
| TSU | Time Standard Unit |
| SSMECA | Space Shuttle Main Engine Controller Assembly |
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