Aeronautical Terms beginning with H
HAT
Height Above Touchdown
HDTA
High Density Traffic Airports
HEMS
Helicopter Emergency Medical Services
HIRL
High Intensity Runway Lights
HIWAS
Hazardous Inflight Weather Advisory Service. Discontinued on January 8, 2020.
HRR
Helicopter Rapid Refueling Procedures
HUD
Head-Up Display
Hz
Hertz
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