| Acronym | Meaning |
 | I | ECO Inboard Engine Cutoff |
| PPS | Printer/Plotter System |
| M/L | Maintenance Loop |
| ET | External Tank |
| VERT | Vertical |
| STIL | Software Test And Integration Laboratory |
| PSI | Pounds Per Square Inch (Static Pressure) |
| OSHA | Occupational Safety And Health Administration |
| SDCL | SuPPlier Documentation Checklist |
| FDM | Frequency Division Multiplexer |
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