Designed to train flight personnel in flights using the basic type of aircraft, to practice in aerobatics, to acquire skill in air fight and to master fundamentals of piloting.
The aircraft is different from the Su-27 only in the two-seat cockpit and in related aerodynamic and design changes. So the Su-27UB can accomplish virtually the same combat missions:
-interception and kill of the enemy aircraft;
-support of other aviation categories;
-support of troops in the forward edge of battle area;
-violation of aerial communications of an enemy;
-destruction of ground and surface objects.
Moreover, due to availability of the second member of the crew, during formation flights the Su-27UB can perform a role of the leader while accomplishing the principal navigation missions.
The aircraft can carry various kinds of external guided and unguided weapons while featuring, apart from this, the GSh-30-1 built-in gun with an ammunition load of 150 cartridges.