| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| Height above touchdown | Transportation | The height above the highest obstruction in a touchdown zone. Source: European Union. (references) | |
| Height above touchdown (hat) | Energy | 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 (HAT) is published on instrument approach charts in conjunction with all straight in minimums. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
