Check your Cessna in the saved flight: Either the battery is off or the generator. To create a consistent start for the Katana 4X do the following:
1: Create a new flight from a default airport with the default Cessna. Do NOT allow FSX to launch direct to this flight, but instead choose submit from the menu options to actually launch the sim once you've made the selections
2: When the sim is launched and stabilised with the Cessna on the runway, switch to the Katana.
3: Move the Katana to your departure airport of choice, then make your selections from the Katana menu as to how you want it to start (cold'n'dark, long time parked, engine running, ready to fly etc etc)
4: Save this as the default flight for this aircraft.
AI aircraft that have missing parts are usually not DX10 compatible. Either turn off DX 10 or choose replacement AI that are compatible.