Special Conditions: Honeywell Aerospace US LLC, Dassault Aviation Model Falcon 900EX Airplane; Electronic System Security Protection From Unauthorized External Access

Document 2026-12277 is a Final Rule published by the Department of Transportation in the Federal Register on June 18, 2026, with an effective date of June 18, 2026. These special conditions are issued for the Dassault Aviation Model Falcon 900EX airplane. This airplane, as modified by Honeywell Aerospace US LLC (Honeywell) 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 systems architecture that will allow increased connectivity to and access from external network sources, (e.g., operator networks, wireless devices, internet connectivity, service provider satellite communications, electronic flight bags, etc.) to the airplane's previously isolated electronic assets (networks, systems, and databases). 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. View the original at https://www.federalregister.gov/documents/2026/06/18/2026-12277/special-conditions-honeywell-aerospace-us-llc-dassault-aviation-model-falcon-900ex-airplane.

No. Document 2026-12277 is not classified as economically significant under Executive Order 12866. Economically significant rules require OIRA review and are estimated to have impacts of $100 million or more per year.