NASA Abbreviations and Acronyms

1. FIR
   Fuel Indicating Reading
2. FIRSSE
   Far Infrared Sky Survey Experiment
3. FIRST
   Flight-Oriented Integrated Reliability and Safety Tool
4. FIS
   Facility Interface Sheet
5. FIS
   Facility Interface Sheets
6. FISA
   Facility Inspection Shakedown Acceptance
7. FISC YR
   Fiscal Year
8. FIT
   Fault Isolation Test
9. FITH
   Fire-In-The-Hole
10. FITS
    Flexible Image Transport System
11. FIV
    Fuel Isolation Valve
12. FIX
    Fixed
13. FKB
    Flight Display Keyboard
14. FL
    Forward Link
15. FL
    Feed Lines
16. FL
    Flag
17. FL
    Mech Fluid Mechanical
18. FL
    Florida
19. FL
    Fail
20. FL
    Fault Identification

Last updated: May 6, 2025 — Total entries: 14,020