I don't know, but Korovye Selo is supposed to be located 30 km north of Ostrov.
So maybe Cherskaya ("Cerskaya")?
http://www.multimap.com/map/browse.c...multimap.y=197
I also used Google Earth to see if I could find any airfield there, but with no result.
http://earth.google.com/
(Try it - it's great. I've been "flying" over lots of places where Graf, Grislawski, Schuck, and others once flew - over the battlefields in Europe and Libya. Fascinating.)