Final answer:
To enter Class D airspace, a pilot must establish communication with ATC, have a functioning Mode C transponder if required, and adhere to VFR weather minimums for visibility and cloud clearance.
Step-by-step explanation:
To enter airspace represented in Class D, an aircraft must meet certain requirements set forth by the Federal Aviation Administration (FAA). Firstly, the pilot must establish two-way radio communication with the air traffic control (ATC) facility responsible for the airspace before entering. Secondly, the pilot must have a transponder with Mode C capabilities if flying at or above 10,000 feet mean sea level (MSL) and within 30 nautical miles of a Class B airspace primary airport. Lastly, visibility and cloud clearance requirements as per VFR (Visual Flight Rules) weather minimums must be met, which include at least three miles visibility and cloud clearance of at least 500 feet below, 1,000 feet above, and 2,000 feet horizontally from cloud formations.