| Acronym | Meaning |
| IACS | Inertial Attitude Control System |
| CC | Crew(s) Certified |
| I | D&CA Inverter Distribution And Control Assembly |
| NAVPOOL | Navigation Parameter Common Pool |
| UP | Upper |
| VRB | VHFRecoveryBeacon |
| OFS | Orbital (Orbiter) Flight System |
| FCEF | Flight Crew Equipment Facility |
| PM | Project Manager |
| POCN | Purchase Order Change Notice |