HI HB421

Establishes a five-year general excise tax exemption for helicopter servicing, maintenance, and facility construction from January 1, 2020 through December 31, 2024.

Exemption applies only if 75% or more of helicopters serviced and maintained annually in the facility are equipped with quiet technology that reduces noise levels.

Expands the definition of "aircraft" under the general excise tax law to include helicopters in addition to multi-jet-engine commercial aircraft.

Requires helicopter service and maintenance facilities to demonstrate compliance with quiet technology standards; no minimum facility size requirement specified for helicopter facilities (differs from 30,000 square foot requirement for jet aircraft facilities).

Sunsets automatically on December 31, 2024, with the statute reverting to its prior form unless legislatively renewed.