There are several weird issues with the Su-25 ("A" and T) that have not been fixed.
First, even with immortality on, the nose wheel steering system breaks very easily, as in it stops working if I turn too hard. With immortality on, the wheel just bursts as I taxi to the runway.
With immortality on, the wings can snap in a high G turn. The plane spins out of control and the wing is on fire bit looks intact (again, with immortality on).
Next, the air brakes only seem to work when flying level; slowing down to land is very difficult (this could be realistic but I don't know).
Finally, the most bizarre issue of all. If the plane hits something , it violently spins around before either exploding or holding still in the air and emitting hundreds of pieces of debris until it slows down the game before crashing it altogether (see the track). Su-25 glitch.trk