| Acronym | Meaning |
| RTIF | Real-Time Interface |
| LPM | Lines Per Minute |
| MCP | Monitoring And Control Panel |
| FHD | Fixed Head Disk |
| ELS | Earth Landing System (Subsystem) |
| NDTF | Nondestructive Test Facility |
| TCP | Test Control Package |
| HSCU | Hydraulic SUPPly And Checkout Unit |
| HBT | Heflex Bio-Engineering Test |
| DCSI | Data And Cqntrol Signal Interface |