Sullenbergers radar I am sure was turned off because no weather was involved in his Hudson river landing. Why turn it on it you don't need it? Flying into TGU with thousands of turkey buzzard I never turned it on because it doesn't do anything to the birds. See and avoid was the only way to miss them. They didn't see and avoid even though he did one hell of a job of putting it into the Hudson safely. Unfortunately nobody was looking out the window as they approached the geese, probably because of cockpit work load switching frequency, etc.