Vertical dimensions of control zones are typically listed as which of the following?

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Multiple Choice

Vertical dimensions of control zones are typically listed as which of the following?

Explanation:
Vertical dimensions of control zones are specified in feet above the surface (AGL) so the ceiling stays fixed relative to the airport, not to sea level. Saying the top is 3000 feet AGL means the zone extends from the surface up to 3000 feet above the local ground. This provides a consistent, terrain-independent airspace boundary for pilots. If the limit were given in feet ASL, the ceiling would vary with elevation, making the airspace harder to interpret and less safe. Therefore, 3000 feet AGL is the correct standard.

Vertical dimensions of control zones are specified in feet above the surface (AGL) so the ceiling stays fixed relative to the airport, not to sea level. Saying the top is 3000 feet AGL means the zone extends from the surface up to 3000 feet above the local ground. This provides a consistent, terrain-independent airspace boundary for pilots. If the limit were given in feet ASL, the ceiling would vary with elevation, making the airspace harder to interpret and less safe. Therefore, 3000 feet AGL is the correct standard.

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