| Acronym | Meaning |
| MAC | Maximum Concentration Of Organics |
| ROC | Request Of Change |
| SSC | Subsystem Sequence Controller |
| HEMV | Helium Manual Valve |
| DCS | Detail Checkout Specification(s) |
| TYP | Typical |
| PCEM | Propulsion Contamination Effects Module |
| SSM | Subsystem Manager |
| RP | Rocket Propellant |
| HTPB | Hydroxyl Terminated Polybutadiene (Propellant) |