| Acronym | Meaning |
 | EM | Emergency |
 | ORD | Operational Requirements Document |
 | PMF | Performance Monitor (Monitoring) Function |
 | MFV | Main Fuel Valve |
 | PM | Payload Midbody |
 | OPE | Other Project Element |
 | NET | NNET Network (N/W Preferred) |
 | CDPIS | Command Data Processing And Instrumentation System |
 | DDA | Digital Differential Analyzer |
 | VTVM | VacuumTubeVoltmeter |