| Abbreviation | Definition |
|---|---|
| AIU | Avionics Interface Unit |
| AIV | Assembly-Integration-Verification |
| AJ | Assembly Jig |
| AK20 | 80% Azotna Kislota + 20% N2O4 |
| AK20 | 80% nitric acid + 20% N2O4 (AK = Azotna Kislota = Nitric Acid) |
| AK20F | 80% nitric acid + 20% N2O4 + fluorine passivant (AK = Azotna Kislota = Nitric Acid) |
| AK20I | 80% nitric acid + 20% N2O4 + Iodine passivant (AK = Azotna Kislota = Nitric Acid) |
| AK27I | 73% nitric acid + 27% N2O4 + Iodine passivant (AK = Azotna Kislota = Nitric Acid) |
| AKM | Apogee Kick Motor |
| AL | Air Lock |
| AL/EMU | Air Lock/Extravehicular Mobility Unit |
| ALAE | Atmospheric Lyman Alpha Experiment |
| ALAS | Approach/Landing Autopilot System |
| ALAS | Automatic Landing Autopilot Subsystem |
| ALC | Aft Load Controller |
| ALC | Audio Load Compensator |
| ALC | Augmented Landing Site |
| ALC | Automatic Light Control |
| ALCA | Aft Load Control Assembly |
| ALCA | Automatic Level Control Assembly |