| Acronym | Meaning |
 | FCOS | Flight Control Operating System |
| FCOS | Flight Control Operational Software |
| FCOS | Flight Control Operational Software |
| FCP | Failure Correction Panel |
| FCP | Firm Cost Proposal |
| FCP | Flight Correction Proposal |
| FCP | Fuel Cell Power (Plant) |
| FCP | Fuel Cell Power Plant |
| FCPS | Fuel Cell Power System (Subsystem) |
| FCR | Final Configuration Review |
| FCR | Flight Configuration Review |
| FCR | Flight Control Room |
| FCR | Flight Control Room |
| FCRA | Fecal Collection Receptacle Assembly |
| FCRT | Flight Display CRT |
| FCS | Fecal Containment System |
| FCS | Federal Communications System |
| FCS | Flight Control System |
| FCS | Flight Control System (Subsystem) |
| FCS | Flight Crew System |
| FCSM | Flight Combustion Stability Monitor |
| FCSS | Fuel Cell Servicing System |
| FCT | Flight Control Team |
| FCT | Flight Crew Trainer |
| FCT | Fuel Cell Test |
| FCTB | Flight Crew Training Building |
| FCTF | Fuel Cell Test Facility |
| FCTS | Flight Crew Trainer Simulator |
| FCU | Fluid Checkout Unit |
| FCW | Format Control Words |
| FD | Fault Detection |
| FD | Feed |
| FD | Flight Day |
| FD | Flight Deck |
| FD | Flight Director |
| FD | Freeze Dried |
| FD | FunCtion Designator |
| FD | WMR Food Warmer |
| FDA | Fault Detection And Annunciation |
| FDA | Flight Deck Assembly (FDF) |
| FDAI | Flight Director Attitude Indicator |
| FDB | Fahrenheit Dry Bulb |
| FDDB | Function Designator Data Base |
| FDF | Flight Data File |
| FDF | Flight Data File |
| FDI | Failure Detector Indicator |
| FDI | Fault Detection And Identification |
| FDI | Fault Detection And Isolation |
| FDIIR | FaLilt Detection |
| FDIIR | Recompensation |
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