The MiG-29S is similar in external appearance to older MiG-29B airframes, except for the dorsal hump behind the cockpit canopy. Differences start with the improvements in the flight control system. Four new computers provide better stability augmentation and controllability with an increase of 2° in angle of attack (AoA). Its improved mechanical-hydraulic flight control system allows for greater control surface deflections. The MiG-29S's dorsal hump, earning it the nickname "Fatback" in service, was originally believed to be for additional fuel, but in fact, most of its volume is used for the new L-203BE Gardenyia-1 ECM system.