Special Conditions: Israel Aircraft Industries Model 1124 Airplanes; High-Intensity Radiated Fields (HIRF)

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These special conditions are issued for Israel Aircraft Industries Model 1124 airplanes modified by Garrett Aviation Services. 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 the installation of dual Innovative Solutions & Support (IS&S) Air Data Display Unit systems with the IS&S Air Data Sensor 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.