| Acronym | Meaning |
 | FF | Free Flight |
 | FFBD | Functional Flow Block Diagram |
 | FFC | Final Flight Certification |
 | FFD | FixedFormatDisplay |
 | FFD | Functional Flow Diagram |
 | FFM | Free-Flying (Experiment) Module |
 | FFP | Firmed Fixed Price |
 | FFTO | Free-Flying Teleoperator |
 | FH | Flex Hose |
 | FHC | Flight Half Coupling |
 | FHD | Fixed Head Disk |
 | FHF | First Horizontal Flight |
 | FHO | Failed Handover |
 | FHP | Fuel High Pressure |
 | FHS | Forward Heat Shield |
 | FI | FlightInstrumentation |
 | FI | Formal Inspection |
 | FIAR | Failure Investigation Action Report |
 | FID | Failure Identification |
 | FID | Flight Implementation Directive |
 | FIDO | Flight Dynamics Officer |
 | FIE | Flight Instrumentation Engineer |
 | FIFO | First In-First Out (High Speed Data Buffers) |
 | FIG | Figure |
 | FIIG | Federal Item Identification Guide |
 | FIL | Filament |
 | FILE | Future Identification And Location Experiment |
 | FIO | Furnished And Installed By Others |
 | FIR | Fuel Indicating Reading |
 | FIS | Facility Interface Sheets |
 | FIT | Fault Isolation Test |
 | FITH | Fire-in-the-Hole |
 | FIV | Fuel Isolation Valve |
 | FKB | Flight Display Keyboard |
 | FL | Fail |
 | FL | Fault Identification |
 | FL | Feed Lines |
 | FL | Flowline |
 | FL | Forward Link |
 | FL | MECH Fluid Mechanical |
 | FLAP | Flight Application Software |
 | FLC | Federal Library Committee |
 | FLC | Forward Load Control |
 | FLCA | Forward Load Controller Assembly |
 | FLD | Field |
 | FLEX | Flexible |
 | FLG | Flag |
 | FLG | Flange |
 | FLLK | Frustum Lifting Lug Kit |
 | FLN | Fuel Line |