Modification of Class D Airspace; Bismarck, ND, Grissom AFB, IN, Muskegon, MI, and Mansfield, OH.

الملخص

This action modifies Class D airspace areas at Bismarck Municipal Airport, Bismarck, ND, Grissom Air Force Base (AFB), IN, Muskegon County Airport, Muskegon, MI, and Mansfield Lahm Municipal Airport, Mansfield, OH; by amending the areas' effective hours to coincide with the associated control tower's hours of operation. The intended effect of this action is to clarify when two-way radio communication with these air traffic control towers is required.