HI cibalko.
Frankly speaking I've never seen any of this kind on Mil helicopters. But if it looks like that
http://www.oosa.unvienna.org/pdf/icg/2009/icg-4/12.pdf (last page) then it might have some similar functions as GNS 530.
Anyway, the only right thing that you can do with this equipment is to try to test it on the ground, with ground power unit.
good luck
