| Acronym | Meaning |
![](file.png) | HDR | High Data Rate |
![](file.png) | FTS | Flight TestSystem |
![](file.png) | CCU | Crewman Communications Umbilical |
![](file.png) | LETF | Launch Equipment Test Facility |
![](file.png) | EB | Electronic Beam |
![](file.png) | SB | Synchronization Base |
![](file.png) | RMS | Redundancy Management System |
![](file.png) | DC | DCARDesign Corrective Action Report |
![](file.png) | OSOP | Orbiter Systems Operating Procedures |
![](file.png) | T/R | Tape Recorder |