| Acronym | Meaning |
 | HRS | Hours |
| ETS | External Tank System (Subsystem) |
| ERBE | Earth Radiation Budget Experiment |
| HAS | Hydraulic Actuation System |
| PSS | Propellant Supply Subsystem |
| EMEC | Electromagnetic Effects Compatibility |
| S | TRKStar Tracker |
| RAAB | Remote Amplifier And Adoption Box |
| SM/PM | System Management/Performance Monitor |
| PLL | Phase Locked Loop |
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