Hi Claude try that,
Start MSFS without “MSFS with FSUIPC7” start the game alone, go to your Bushtrip start the flight (to be on the take-off runway) If no CTD start FSUIPC7 … I think the problem comes from “FSUIPC7” (Tell me if it works) 
Hi Claude try that,
Start MSFS without “MSFS with FSUIPC7” start the game alone, go to your Bushtrip start the flight (to be on the take-off runway) If no CTD start FSUIPC7 … I think the problem comes from “FSUIPC7” (Tell me if it works)