Special Conditions; Duncan Aviation Inc., EFIS on the Raytheon 300 King Air; Protection of Systems for High Intensity Radiated Fields (HIRF)

These special conditions are issued to Duncan Aviation Inc., 15745 S Airport Rd Battle Creek, MI 49015, for a Supplemental Type Certificate for the Raytheon 300 King Air. This airplane will have novel and unusual design features when compared to the state of technology envisaged in the applicable airworthiness standards. These novel and unusual design features include the installation of an electronic flight instrument system (EFIS). The EFIS consists of the Universal Avionics, Inc. EFI-890R system for which the applicable regulations do not contain adequate or appropriate airworthiness standards for the protection of these systems from the effects of high intensity radiated fields (HIRF). The installation includes three EFI- 890R Flat Panel Displays (two Primary Flight Displays Pilot/Copilot and one Navigational Displays Pilot), and supporting equipment. These special conditions contain the additional safety standards that the Administrator considers necessary to establish a level of safety equivalent to the airworthiness standards applicable to these airplanes.