| Abbreviation | Definition |
|---|---|
| EXPEN | EXPENdable |
| EXT | EXperiment Terminal |
| EXT | EXTension |
| EXT | EXTernal |
| EXTD | EXTenD |
| EXTER | EXTERnal |
| EXTGH | EXTinGuisH |
| F | Failure |
| F | Farad |
| F | Flight |
| F | Front |
| F&E | Facility and Environment |
| F&S | Fire and Smoke detection |
| F/A | Failure Analysis |
| F/A | Fuel to Air ratio |
| F/C | Fit Check |
| F/C | Flight Controller |
| F/C | Fuel Cell |
| F/D | Fill/Drain |
| F/E | Full/Empty |