Definition of “Height Above Touchdown Elevation (HAT)”
Height Above Touchdown Elevation (HAT) is a critical term used in aviation that represents the vertical difference between an aircraft’s altitude and the touchdown zone of a runway. The HAT is calculated as the height of the aircraft above the highest point on the runway within the first 3,000 feet of the approach zone.
It is commonly used in instrument approach procedures where pilots rely on visual cues to land the aircraft. The HAT value is an important measurement that indicates the minimum height an aircraft must maintain during the approach in order to ensure a safe landing. Therefore, it is a crucial consideration for pilots, air traffic controllers, and airport authorities.
Clear communication of HAT values is necessary for aircraft approach and landing. Pilots must be aware of the HAT value on their approach chart and constantly monitor their altitude during the landing process. Air traffic controllers must also be aware of the HAT value when communicating with pilots in order to ensure safe separation between aircraft.
In summary, the Height Above Touchdown Elevation (HAT) is the vertical distance between an aircraft’s altitude and the highest point on the runway within the first 3,000 feet of the approach zone. It is an essential term in aviation that aids pilots in ensuring a safe landing by maintaining a minimum altitude during the approach.
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