Special Conditions: Israel Aircraft Industries, Ltd. Model 1124/1124A Airplanes; High Intensity Radiated Fields (HIRF)

These special conditions are issued for Israel Aircraft Industries, Ltd. Model 1124/1124A airplanes modified by Duncan Aviation. These airplanes, as modified by Duncan Aviation, will have novel and unusual design features when compared to the state of technology envisioned in the airworthiness standards for transport category airplanes. The modification incorporates the installation of a dual Collins AHS-3000A Attitude Heading Reference System (AHRS). 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 provided by the existing airworthiness standards.