If the obstacle on the approach route is eight meters tall, what is the unusable space for the departure route if the obstacle there is ten meters tall?

To determine the unusable space for the departure route in relation to an obstacle height, one approach used is to apply standard military aviation criteria, specifically the obstacle clearance requirements that relate to both the height of the obstacle and its distance from the flight path.

In this scenario, the approach obstacle is eight meters tall, and for safe maneuvering during departure, the required clearance around obstacles is often calculated based on their height. The guideline usually suggests that for every meter of obstacle height, there is a corresponding distance on the ground that must remain clear for safe departure.

The ten-meter tall departure obstacle requires consideration of the additional clearance needed when departing. Given the established criteria, a ten-meter tall obstacle would typically necessitate a horizontal clearance zone that is significantly larger than that of the shorter eight-meter obstacle. In this case, the separation distance required from a ten-meter obstacle can be extrapolated using these clearance guidelines, leading to a conclusion that the unusable space for the departure route is 100 meters.

This distance ensures that aircraft can safely depart without risk of collision with the obstacle or encountering turbulent airflow that could be generated by nearby obstructions. Thus, the choice indicating 100 meters reflects an understanding of the operational safety standards in aviation concerning obstacle clearance during both approach