| Acronym | Meaning |
 | IPS | IRU Inertial Reference Unit |
| SIS | Shuttle Information System |
| VFI | Verification Flight Instrumentation |
| MC | Mission Completion/Continuation |
| DDI | Discrete Data Input |
| PPM | EPacific Plate Motion Experiment |
| SAU | Signal Acquisition Unit |
| INSTALLATIO | Installation Notification Certificate |
| SRD | Shuttle Requirements Definition |
| PAMB | Pressure Ambient |
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