Special Conditions: Gulfstream Model LP 1125 Westwind Astra Airplane; High Intensity Radiated Fields (HIRF)

These special conditions are issued for the Gulfstream Model LP 1125 Westwind Astra airplane modified by Duncan Aviation, Inc. This airplane will have novel and unusual design features when compared to the state of technology envisioned in the airworthiness standards for transport category airplanes. 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.