| Acronym | Meaning |
| ERA | Electrical Replaceable Assembly |
| INTERCOMMUN | Intercommunications |
| IECS | Igloo Environment Control Subsystem |
| B/C | Bench Check |
| GCIL | Ground Control Interface Logic |
| HGR | Hangar |
| PERIGEE | AlPerigee Altitude |
| FILE | Future Identification And Location Experiment |
| TLM | Telemetry |
| I | D&CA Inverter Distribution And Control Assembly |