FAA Ground School Practice Test

The lateral dimensions of Class D airspace are based on what criteria?

1. The population density of the area

2. The instrument procedures for which the controlled airspace is established

3. The size of the airport's facilities

4. The height of surrounding terrain

The correct answer is: The instrument procedures for which the controlled airspace is established

The correct choice accurately reflects that the lateral dimensions of Class D airspace are determined by the instrument procedures established for that airspace. Class D airspace is designed to effectively support the operations of the air traffic control system, particularly around airports that have an operating control tower. The lateral boundaries of Class D airspace are specifically tailored to encompass the area that is necessary to manage air traffic efficiently in relation to the specific instrument approaches and departures. This includes considerations for safe separation and the needs of aircraft transitioning to and from departure and arrival routes. Other criteria, such as population density, airport facility size, or surrounding terrain height, may influence airspace classification or operations, but they do not dictate the lateral dimensions of Class D airspace. Instead, those dimensions are strictly linked to the flight paths and procedures that need to be contained within the airspace for effective air traffic management.