 Flight testing has revealed that "assaulting" multiple limiters at high AOA and low speed can result in an AOA far exceeding the 25° limit, colloquially referred to as "departing"; this causes a deep stall; a near-freefall at 50° to 60° AOA, either upright or inverted.While at a very high AOA, the aircraft's attitude is stable but control surfaces are ineffective; the pitch limiter locks the stabilators at an extreme pitch-up or pitch-down attempting to recover, this can be overridden so the pilot can "rock" the nose via pitch control to recover.Unlike the YF-17, which had hydromechanical controls serving as a backup to the FBW, General Dynamics took the innovative step of eliminating mechanical linkages between the control stick and rudder pedals, and the flight control surfaces.