| Acronym | Meaning |
| TT&C | Tracking Telemetry And Control |
| LESS | Leading Edge Structure Subsystem |
| RF-TK | Radio Frequency Tracking |
| GCE | Ground Checkout Equipment |
| RDP | Receiver And Data Processor |
| ERSI | Elastomeric Reusable Surface Insulation |
| FEA | Failure Effects Analysis |
| NAVPOOL | Navigation Parameter Common Pool |
| ESMC | ETR |
| SM | SYstems Management |