This, and many other aircraft, recently required updates to make them compatible with the new Working Title GNS 530, which is available in the in-game marketplace.  This GPS caused significant unintended consequences with hot-swappable avionics, such as are in this aircraft.  Please make sure that you have updated all the avionics packages that you are using, including the TDS GTNxi 750, the PMS50 GTN 750, and the WT GNS 530.  Please see the changelog and “Third Party Navigation & GPS Systems'' section of this manual for more information.