(a) General. Unless otherwise authorized or required by the
ATC facility having jurisdiction over the
Class D airspace area,
each person operating an aircraft in Class D airspace must comply with the applicable provisions of this section. In addition, each person must comply with
§§ 91.126 and 91.127. For the purpose of this section, the primary
airport is the airport for which the Class D airspace area is designated. A satellite airport is any other airportwithin the Class D airspace area.
) Communications. Each person operating an aircraft in Class D airspace must meet the following two-way radio communications requirements:
(1) Arrival or through flight. Each person must establish two-way radio communications with the ATC facility (including foreign ATC in the case of foreign airspace designated in the
United States) providing
air traffic services prior to entering that airspace and thereafter maintain those communications while within that airspace.
(2) Departing flight. Each person—
(i) From the primary airport or satellite airport with an operating control tower must establish and maintain two-way radio communications with the control tower, and thereafter as instructed by ATC while operating in the Class D airspace area; or
(ii) From a satellite airport without an operating control tower, must establish and maintain two-way radio communications with the ATCfacility having jurisdiction over the Class D airspace area as soon as practicable after departing.
My question is why you were monitoring their freq?