| 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 |