Special Conditions: Raytheon Aircraft Company Model MU-300 and MU-300-10 Airplanes and Model 400 Airplanes; High-Intensity Radiated Fields (HIRF)

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These special conditions are issued for Raytheon Aircraft Company Model MU-300 and MU-300-10 airplanes and Model 400 airplanes modified by Beechjet TECH. These modified airplanes will have a novel or unusual design feature when compared to the state of technology envisioned in the airworthiness standards for transport category airplanes. The modification incorporates installation of two Shadin ADC-6400 RVSM-capable air data computers that perform critical functions. The applicable airworthiness regulations do not contain adequate or appropriate safety 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 that established by the existing airworthiness standards.