| Acronym | Meaning |
| PTCS | Passive Thermal Control System |
| GNCS | GuGNCSGuidance And Navi-oation Control System |
| PDL | Program Design Language |
| SVC | Supervisor Call |
| OFI | Operational Flight Instrumentation |
| RMS | Redundancy Management System |
| FB | Feedback |
| MIN | Minimum |
| DCM | Display And Control Module |
| HEX | Hexadecimal |