The MiG-23 was designed in 1964-66 as a successor to the MiG-21. In addition to a much more powerful engine, the MiG-23's most significant new feature was its variable sweep wing. Like the USAF's swing wing F-111, the sweep of the wings could be changed in flight. Fully spread, this gives a shorter takeoff/landing roll while carrying a heavier weapons load. With the wings fully swept back, the MiG-23 has greater speed. The wing has three sweep settings: 16, 45, and 72 degrees. The prototype first flew in April 1967 and MiG-23s began entering operational service in 1971. The MiG-23MLD is the most advanced version of the MiG-23 Flogger. It features a distinctive notch in the leading edge of the wing glove to improve angle of attack handling. The MiG-23 operational experience in Afghanistan prompted the modification of late production MiG-23MLDs, and these aircraft were equipped with a more sophisticated SPO-15L radar warning receiver that located more accurately the approaching direction of any hostile aircraft.
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