These had newer engines ( Soloviev D - 30 instead of Kuznetsov NK - 8 ) .
Both of these turbofan engines shared the same critical point -- low pressure turbine and engine shaft design and construction .
These had newer engines ( Soloviev D - 30 instead of Kuznetsov NK - 8 ) , but both of these turbofan engines shared the same critical point -- low pressure turbine and engine shaft design and construction .