Special Conditions; Garmin AT, Inc.; EFIS on the Raytheon Model B58; Protection of Systems for High Intensity Radiated Fields (HIRF)

These special conditions are issued to Garmin AT, Inc., 2345 Turner Rd., SE., Salem, Oregon 97302, for a Supplemental Type Certificate for the Raytheon Model B58. The 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) display, Model G-1000, manufactured by Garmin International Inc., 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). 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.