The WXR R / T sends display data on an ARINC 453 data bus to the terrain weather relays. The display data goes from the terrain weather relays to the DEUs to show on the navigation displays. The terrain / weather radar relays are controlled by the ground proximity warning computer (GPWC).
The WXR R / T sends windshear alert data on an ARINC 708A hazard bus to the ground proximity warning system (GPWS). The GPWS uses this data to prioritize alert callouts. If a higher GPWS alert exists, the GPWC switches the terrain weather relays and terrain data is shown on the NDs.
Abbreviations and Acronyms | Antenna | WXR System Components | Antenna Pedestal | WXR System Messages | Sweep Patterns | WXR System Fail Messages and Display | General | Predictive Windshear Inputs | WXR Central Processor Unit |