the wreckage had been found through drone images before the air force's helicopters were deployed.
From now on drone deployment appears to have become a standard tool in both SAR and investigative efforts. Similar use in the Antonov case. And especially helpful in difficult conditions ... Like the high snow in these two 2018 cases. In this case the helicopters could not land and people on foot are the only option. Drones make a search far more efficient and effective which is a great help for those in SAR and contributes to their safety.