roncachamp
Final Approach
I'm going to toss in an actual flight path for some real world context and see what y'all think.
Here are a couple more flight paths for some real world context. The red polygon in the attached image shows the lateral boundaries of Green Bay TRACON. Note that it is considerably larger than the Green Bay Class C airspace area.
The green line shows the flight path of a VFR arrival to KGRB at 3000 MSL. The aircraft establishes radio contact with approach when it is west of Oshkosh. About eleven miles north of Oshkosh is Outagamie County Airport near Appleton, the aircraft will go through the center of the Appleton Class D airspace area. When the aircraft is about ten miles southwest of KATW approach calls the tower and coordinates the transition of the Class D airspace, which the aircraft completes in about four minutes.
The purple line shows the flight path of a VFR thruflight of Green Bay approach control airspace at 3500 MSL. The aircraft is receiving flight following from Minneapolis Center as it approaches the western boundary of Green Bay approach airspace. Center completes a radar handoff to approach and transfers communications. Approach continues to provide flight following as well as Class C services while the aircraft is within twenty miles of KGRB. As it nears the Class C airspace area proper the aircraft is instructed to maintain VFR at or above 3,500 until further advised because Green Bay tower clears departing aircraft to 3,000 MSL. When the aircraft is no longer a potential conflict with KGRB departures the altitude restriction is cancelled. When the aircraft reaches the vicinity of the Lake Michigan shoreline approach completes a radar handoff to Minneapolis Center and transfers communications.
The significant differences in these two scenarios are the distances involved and services provided. It took the aircraft about four minutes to transit the Appleton Class D airspace. The services provided to VFR aircraft in Class D airspace are exactly the same as in Class E airspace; traffic advisories and safety alerts. It takes the aircraft about forty minutes to transit Green Bay approach airspace and the service varies; while within the Outer Area of Class C airspace, when it's within twenty miles of KGRB, the aircraft also receives separation from IFR aircraft. Also, the same approach controller works both sides of the Appleton Class D transition while the Green Bay approach transition involves three sectors within Green Bay approach and returns to a different sector of Minneapolis ARTCC.
It makes sense to coordinate the transition of Class D airspace; it's simple and brief. That's not the case with Class C airspace while in communications with an ARTCC. If you're still on a center frequency when you near a Class C boundary you are likely well within the airspace owned by a different ATC facility. You should conclude that somebody fooked up.
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