Abstract: There is provided a method for transmitting safety-critical data from an aircraft control domain, ACD, router to a ground system via a Virtual Safety Radio, VSR, provided by a cross-router, X-router, interface between the ACD router and one or more non-safety communication domain routers, the method comprising: determining, by the VSR, that at least one non-safety media link of at least one non-safety communication medias of the one or more non-safety communication domain routers is available for conveying safety traffic from the ACD, responsive to the determination that at least one non-safety media link is available, receiving, by a communication stack of the ACD router, an application message; and sending, via the VSR, the application message to the ground system through the at least one available non-safety media link.

Abstract: This communications device (CMU) on board an airborne platform (PAE) is compatible with the frequency management mechanism defined by the VDL mode 2 standard. It comprises: activation module for activating a receiver module (VDR2) to scan an alternative frequency (FQ2) taken from a pair contained in a list (LST) of pairs received by a bidirectional module (VDR3) in communication with a ground station on another frequency; detector module for detecting at least one criterion representative of a break in communication with said ground station; and configuration module for configuring a bidirectional module (VDR3) for communicating on the alternative frequency (FQ2) with a target ground station (VGS2) heard by the receiver module.

Abstract: This communications device (CMU) on board an airborne platform (PAE) is compatible with the frequency management mechanism defined by the VDL mode 2 standard. It comprises: activation module for activating a receiver module (VDR2) to scan an alternative frequency (FQ2) taken from a pair contained in a list (LST) of pairs received by a bidirectional module (VDR3) in communication with a ground station on another frequency; detector module for detecting at least one criterion representative of a break in communication with said ground station; and configuration module for configuring a bidirectional module (VDR3) for communicating on the alternative frequency (FQ2) with a target ground station (VGS2) heard by the receiver module.