Special Conditions; Raytheon Model King Air H-90 (T-44A) Protection of Systems for High Intensity Radiated Fields (HIRF)

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These special conditions are issued to ARINC Inc., 1632 S. Murray Blvd., Colorado Springs, CO 80916 for a Supplemental Type Certificate for the Raytheon Model King Air H-90 (T-44A) airplane. These airplanes will have novel and unusual design features when compared to the state of technology envisaged in the applicable airworthiness standards. The novel and unusual design features include the installation of the Rockwell Collins Pro Line 21 Avionics System. This system includes Electronic Flight Instrument Systems (EFIS), electronic displays, digital Air Data Computers (ADC), and supporting equipment. 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.