| Acronym | Meaning |
 | LBNPD | Lower Body Negative Pressure Device |
| PIO | Pilot-Induced Oscillation |
| SOMF | Start Of Minor Frame |
| SDC | Shallow Draft Board |
| MSBLS | Microwave Scan Beam Landing System |
| IUS | Inertial UPper Stage (was Interim UPper Stage) |
| ESR | Engineering Support Request |
| FCS | Flight Control System (Subsystem) |
| TAL | Transatlantic Abort Landing |
| MDT | Mean Detonating Time |
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