| Acronym | Meaning |
| SPII | Shuttle Program Implementation Instruction |
| K | Kilo (1000) |
| MEC | Master Events Controller |
| ETD | External Tank Door |
| EL | Electromagnetic Interference |
| S&A | Science And Application |
| H | AlH AlHead |
| OMSP | Operational Maintenance Support Plan |
| EEL | Electrical Equipment List |
| MARS | Modular Airborne Recorder System |