| Acronym | Meaning |
 | SPO | Shuttle Projects Office |
| TBI | Through-Bulkhead Initiator |
| UCS | UnUtilities Control System |
| EDF | Engineering Data File |
| HSI | Horizontal Situation Indicator |
| HMCC | Hypergolic Maintenance And Checkout Cell |
| M50 | Mean Of 1950 (Coordinate System) |
| DU | Display Unit |
| OIV | Oxidizer Isolation Valve |
| DWV | Dielectric Withstanding Voltage |
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