| Acronym | Meaning |
| PDA | Propellant Drain Area |
| EMCC | Emergency Mission Control Center |
| PTC | Portable Temperature Controller |
| NOM | Network OutPut Multiplexer |
| SSC | L Shuttle System Commonality List |
| SSP | Standard Switch Panel |
| MM | Math Model |
| F/A | Fuel-Air |
| DI | Display Interface Processor (Software Functional Element) |
| EFCS | Earth Fixed Coordinate System |