Wing control system "SPK-1A" allowing the setting of any angle of the wing arrow from 16 ° to 72 ° .Regulations for the use of the aircraft, however, allowed the use of angles 16 ° 45 ° and 72 °. Discussion with pilots of the USSR The MLD version used a wing angle of 30 ° instead of 45 ° for maneuver combat, when depending on the stabilizer deflection angle, angle of attack and speed, the leading edge of the wing was automatically lowered by 20 ° without deflection of the flaps. achievable number M = 1.4 on both angles of the arrow.ML-ka leading edge, of course, did not tilt, but slightly increased the area of the wing and improved stability.
The moving part of the wing was equipped with a flap with flaps: take-off - 25 °, landing -50 °. Simultaneously with the flaps, the leading edge tilted to the already stated value of 20 °. In the case of suspension of fueltanks with both 800 l, the sash was extended to the 16 ° position and locked mechanically in it. At the same time, the flap was extended only to 25 ° (electrically blocked).
After dropping the fueltanks, the wing was controllable in its entirety.