| Acronym | Meaning |
 | FDIR | Fault Detection Identification/Isolation And |
| FDIR | Recovery/Recognition |
| FDL | Flight Director Loop |
| FDLN | Feedline |
| FDM | Flight Data Manager |
| FDM | Frequency Data Multiplexer |
| FDM | Frequency Division Multiplexer |
| FDM | Frequency Division Multiplexing |
| FDO | Fee Determination Official |
| FDO | Flight Dynamics Officer |
| FDOR | Flight Design Operations Review |
| FDR | Final Design Review |
| FDR | Flight Data Recorder |
| FDR | Functional Design Review |
| FDRI | Flight Director Rate Indicator |
| FDS | Flight Design And Scheduling |
| FDS | Flight Design System |
| FDS | Flight Dynamics Simulator |
| FDS | Flight Dynamics Software/System |
| FDS | Fluid Distribution System |
| FDS | Functional Design Specifications |
| FDSC | Flight Dynamics Simulation Complex |
| FDSC | Flight Dynamics Situation Complex |
| FDU | Fluid Distribution Unit |
| FDX | Full Duplex |
| FEA | Failure Effects Analysis |
| FEAT | Final Engineering Acceptance Test |
| FEB | Forward Equipment Bay |
| FEC | Field Engineering Change |
| FEC | Forward Events Controller |
| FED | Flight Events Demonstration |
| FEDP | Facility And Equipment Design Plan |
| FEID | Flight Equipment Interface Device |
| FEID | Functional Engineering Interface Device |
| FEM | Finite Element Method |
| FEMCPL | Facilities And Envir- Measurement Comp. Parts List |
| FEP | Floral Ethel Propane |
| FEP | Fluorinated Ethylene Propylene |
| FEP | Front End Processor |
| FERD | Facility And Equipment Requirements Document |
| FES | Flash Evaporator System |
| FES | Flash Evaporator System |
| FES | Flight Element Set |
| FESL | Failure Effects Summary List |
| FET | Field Effect Transistor |
| FET | Flight Elapsed Time |
| FEWG | Flight Evaluation Working Group |
| FF | Flight Forward |
| FF | Flight Forward |
| FF | Flip Flop |
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