Special Conditions: Aerospace Design & Compliance, LLC (ADC), Textron Aviation Inc. Model 550, 560, and 560XL Airplane; Electronic System Security Protection From Unauthorized Internal Access

These special conditions are issued for the Textron Aviation, Inc. (Textron) 550 (Bravo), 560 (Ultra Encore), and 560XL (Excel) series airplane as modified by Aerospace Design & Compliance, LLC (ADC). These 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. This design feature is the installation of a digital system that contains a wireless and hardwired network with hosted application functionality that allows access, from sources internal to the airplane, to the airplane's internal electronic components. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for this design feature. 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.