The airspace over Collin Co RGL McKinney (TKI) is controlled from the surface to which altitude MSL?

• A. 1,200 ft MSL
• B. 2,900 ft MSL
• C. 18,000 ft MSL
• D. 4,000 ft MSL

Answer: (B)

The key idea is that the airspace around a towered airport like TKI is Class D, which is controlled airspace from the surface up to a published ceiling. That ceiling is shown on sectional charts in MSL. For Collin County Regional, the chart lists the top of the Class D as 2,900 feet MSL, so the controlled airspace over the airport extends from the surface to 2,900 ft MSL. Since the airport’s field elevation is about 400 ft MSL, this corresponds to roughly 2,500 ft above the airport (2,900 − ~400), matching the typical 2,500 ft AGL ceiling of Class D. The other numbers don’t reflect the published ceiling for this airspace around TKI.