Special Conditions: Cessna Aircraft Company Cessna Model 500 Airplanes; High Intensity Radiated Fields (HIRF)

These special conditions are issued for Cessna Aircraft Company Cessna Model 500 airplanes modified by Honeywell International, Inc. These modified airplanes 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 dual Honeywell RVSM (reduced vertical separation minimum)-capable AM-250 electronic barometric altimeters. 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.