Air traffic control tower Class D airspace is usually what dimensions, but can vary greatly?

Question

BlackTom AI · Accepted Answer

Interpretation of the question centers on standard dimensions for Class D airspace around a control tower. 
Option A: 'From FL 180 to FL 600' describes high-altitude, en-route airspace layers rather than a surface-to-limited-criteria environment; Class D does not extend from flight level 180 upward, so this is incorrect.
Option B: '30nm radius and up to 10,000 MSL' suggests a very large, multi-ring structure incompatible with typical Class D dimensions; standard Class D is not defined by a 30 nm radius or by a ceiling as high as 10,000 feet MSL, thus this misstates the scale.
Option C: '10nm radius and up to 4,000 AGL' proposes a larger radius and a higher ceiling than standard for most Class D airspaces; while some regional differences exist, the common depiction is not 10 nm or 4,000 feet AGL, making this option incorrect.
Option D: '4nm (5sm) radius and 2,500 AGL' matches the widely taught standard: Class D typically extends from the surface to 2,500 feet above ground level within a 4 nautical mile (approximately 5 statute miles) radius around the primary airport with a controll tower. This corresponds to the conventional definition and aligns with pilot and controller practices.

FA25: AVIA-73 Sec 01 - Air Traffic Control 2.5 Quiz 2 - Current ATC Structure and Operations

Air traffic control tower Class D airspace is usually what dimensions, but can vary greatly?

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