Special Conditions; Piper Cheyenne PA-31T2; Protection of Systems for High Intensity Radiated Fields (HIRF)

These special conditions are issued to Carpenter Avionics, Inc., 624-B Fitzhugh Blvd., Smyrna Airport, Smyrna, Tennessee 37167, for a Supplemental Type Certificate for the Piper Cheyenne PA-31T2 airplane. This airplane will have novel and unusual design features when compared to the state of technology envisaged in the applicable airworthiness standards. These novel and unusual design features include the installation of electronic flight instrument system (EFIS) displays for which the applicable regulations do not contain adequate or appropriate airworthiness 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 the airworthiness standards applicable to these airplanes.