Special Conditions: Gulfstream G-1159, G-1159A, G-1159B Series Airplanes; High-Intensity Radiated Fields (HIRF)

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These special conditions are issued for Gulfstream G-1159, G- 1159A, G-1159B series 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 a Honeywell Epic Control Display System for Retrofit (CDS-R). The system consists of dual Electronic Primary Flight Display Systems, which replace the existing Primary Flight Display System. The Electronic Primary Flight Display Systems will utilize electrical and electronic systems 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.