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Class D Airspace. Class D airspace is generally from the surface to 4,000 ft. above the airport elevation (charted in MSL) surrounding those airports that have an operational control tower. The configuration of each Class D airspace area is individually tailored and when instrument procedures are published, the airspace is normally designed to contain the procedures.
Class C and D Airspace Class C airspace and Class D airspace are lumped together because the requirements are identical (See Figure 4). The Flight Visibility minimums for both are also the same as for Class B; 3sm. The Distance From Clouds now has some numbers to remember.emember COC for the Distance From the Clouds. So, for Class B, the Basic VFR Weather Minimums are 3sm and COC. Airspace Flight Visibility Distance From Clouds Class B 3 Statute Miles (sm) Remain Clear of Clouds (COC) Figure 3 - Class B Basic VFR Weather Minimums Say It 3sm and COC for Class B Memorize it and move on.