For any owners with the BK KI-300 or Sandia SAI-340, the FAA issued an emergency AD 2020-18-51 for incorrect attitude information.
This is an interim AD. "This emergency AD requires, before further flight, revising the existing Airplane Flight Manual (AFM) for your airplane to prohibit operation under Instrument Flight Rules (IFR) or night Visual Flight Rules (VFR) and prohibit coupling the autopilot with an affected attitude indicator."
see the attached: 2020-18-51_Emergency.pdf