| Acronym | Meaning |
 | IFRU | In-Flight Replacement Unit |
| FCOS | Flight Control Operational Software |
| TER | Time Estimating Relationship |
| IVC | Intervehicular Communications |
| TS | Test Stand |
| PRM | Pulse Rate Modulation |
| TPS | Thermal Protection Subsystem |
| DPN | L Distribution Panel |
| IACS | Inertial Attitude Control System |
| DRD | Document Requirement Description |
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