Special Conditions; Garmin International, Inc.; Raytheon Model C90A King Air; Protection of Electronic Flight Instrument System from the Effects of High Intensity Radiated Fields (HIRF)

These special conditions are issued to Garmin International Inc., 1200 East 151st Street, Olathe, Kansas, 66062, for a Supplemental Type Certificate for the Raytheon Model C90A King Air airplane. 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 electronic flight instrument system (EFIS) displays in the Garmin G1000 system, GFC 700 autopilot, Mid-Continent Instrument Attitude Indicator and Sandia Avionics cooling fans. 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.