What happens if communication with ATC is not established before entering Class D airspace?

When approaching Class D airspace, it is essential for a pilot to establish communication with Air Traffic Control (ATC) prior to entering that airspace. This requirement is in place to ensure the safety and efficiency of air traffic operations within the area, which often encompasses busy airports and their associated traffic.

If communication with ATC is not established before entering Class D airspace, the aircraft may be denied entry. This denial is based on the need for ATC to manage the traffic flow effectively and ensure that all aircraft operating within the airspace are accounted for, allowing for safe separation and coordination. Therefore, without proper communication, the ATC's ability to provide traffic advisories, clearances, and other vital information to maintain safety can be compromised, leading to potential conflicts with other aircraft.

The other scenarios do not accurately reflect the requirements. Special permission is not a standard procedure that allows entry without prior communication. Similarly, there is no requirement for a pilot to return to the departure airport or specifically follow visual flight rules if ATC communication is not established. Instead, the focus must be on obtaining that communication to safely enter the Class D airspace.