What is the minimum level of qualification required to operate in Class D airspace?

The minimum level of qualification required to operate in Class D airspace is BUQ-II. This designation indicates that a pilot has undergone training that encompasses the necessary concepts and regulations pertinent to Class D airspace, which includes understanding the communication protocols with air traffic control and the operational procedures specific to this airspace classification. Class D airspace typically surrounds airports with an operating control tower, and the pilot must be aware of the specific requirements for entering and navigating within this environment. Thus, holding a BUQ-II qualification ensures that a pilot possesses the foundational knowledge and skills necessary to operate safely in this airspace.