| Acronym | Meaning |
| TCS | Thermal Control System |
| FPD | Flight Projects Directorate |
| ACE | Advanced Composition Explorer |
| PM | Pressurized Module |
| HOTOL | HOrizontal TakeOff And Landing |
| OSSE | Oriented Scintillation Spectrometer Experiment |
| ELV | Expendable Launch Vehicle |
| UDMH | Unsymmetrical DiMethyl Hydrazine |
| NBS | National Bureau Of Standards |
| AIPS | Astronomical Image Processing System |