Aeronautical Terms beginning with H

HAA

Height Above Airport.

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HAL

Height Above Landing.

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HAR

High Altitude Redesign

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HAT

Height Above Touchdown Elevation.

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HAZMAT

Hazardous Materials

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HCH

Heliport Crossing Height

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HDTA

High Density Traffic Airports

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HEMS

Helicopter Emergency Medical Service

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HF

High Frequency.

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HFDL

High Frequency Data Link

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Hg

Abbreviation for mercury, from the Latin hydrargyrum.

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HIRL

High-Intensity Runway Light System.

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HITS

Highway In The Sky

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HIWC

High Ice Water Content

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hPa

hectopascal

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hr

hour

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HRR

Helicopter Rapid Refueling Procedures

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HRRR

High Resolution Rapid Refresh

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HS

Hot Spot

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HSAC

Helicopter Safety Advisory Council

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HSI

Horizontal Situation Indicator.

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HSpec

Helicopter Specification

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HUD

Head-Up Display.

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Hz

Hertz

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