this phenomena was quite pronounced when the AH-1G was fielded in the late 60's due to the maneuvering and high angle/high speed weapons delivery that was used at the time, in fact low-g roll and recovery was a demo maneuver at Cobra Hall until someone discovered how dangerous it was. The corrective action is aft cyclic followed by rolling level. The following is from the AH-1S Operator's Manual (-10)
Capture.JPG