aeroflot, airlines, art, average, four-engine, helicopters, il- 18, ilyushin, in a simple, is designed to detect, ka- 27, length, next to a depth of 500m, nizkoplan, odnokilevym, of the ussr ., okb kamov, passenger, performed, plane, plumage, scheme, soviet antisubmarine helicopter, track and destroy submarines, turboprop, was established in the late 70 g