Re: question regarding TRACON & Class D
Matt,
In a Class C, you are being sequenced by approach to the airport so you have permission to enter the Class C, the same thing goes for a Class D if you are being worked by a radar facility to the Class D airport.
Approach should switch you to the tower in sufficient enough time for you to call the tower and receive a landing clearance and or a sequence (in the case of Class D).
If you are overflying a Class C airspace and you are talking with the approach control they you have permission to transition the Class C. If you DO NOT establish 2 way radio communication with the Approach Control facility and you fly through the Class C then you have committed a Pilot Error and you will be expected to contact the facilites airspace that you violated.
Mike R
FWA