Height Above Touchdown Elevation (HAT)
HELI
Helicopter (ICAO Definition) ...
Height above touchdown elevation (HAT). The DA/DH or MDA above the highest runway elevation in the touchdown zone (first 3,000 feet of the runway).
HF. High frequency.
Hg. Abbreviation for mercury, from the Latin hydrargyrum.
HEIGHT ABOVE TOUCHDOWN- The height of the Decision Height or Minimum Descent Altitude above the highest runway elevation in the touchdown zone (first 3,000 feet of the runway).
Height Above Touchdown zone - The height in feet of the Decision Height (DH) or Minimum Descent Altitude (MDA) above the TouchDown Zone Elevation (TDZE).
HIGH ...
Failure to identify requires a
missed approach.
Height above touchdown (Hat)
The decision height above the touchdown zone.
Final approach fix (FAF):
The beginning of the final approach segment ...
Provided specific criteria are met, appropriately certified aircrews may conduct: (1) an ILS Category II approach procedure to a height above touchdown of not less than 100 feet and with runway visual range of not less than 1,200 feet, ...
 See also: Airspeed, Direct, Pilot, Airport, Air traffic
  
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