Federal Aviation Administration Abbreviations and Acronyms

1. HRI
   Hazard Risk Index
2. HRS
   Hours
3. HRS
   Hazard Records
4. HRT
   Hazard Review Team
5. HSI
   Horizontal Situation Indicator
6. HST
   Host Identifier
7. HTSC
   Hughes Technical Services Company
8. HTZ
   Helicopter Touchdown Zone
9. HUD
   Heads Up Display
10. HUL
    Horizontal Uncertainty Level
11. HUM FACTORS
    Human Factors
12. HVAC
    Heating, Ventilation, and Air Conditioning
13. HW
    Hardware
14. HWCI
    Hardware Configuration Item
15. HZ
    Hertz
16. IA
    Investment Analysis
17. IACSP
    International Aeronautics Communications Service Provider
18. IADS
    Iceland Air Defense System
19. IAF
    Initial Approach Fix
20. IAG
    International Association of Geodesy

Last updated: September 10, 2020 — Total entries: 2,563