Since its original design, the 737 has become 61% heavier, 24% longer, and 40% wider, and its engines twice as powerful. These experts are concerned that the loads on the jack screw have potentially increased since the creation of the 737. By regulations, the controls must be designed for 125% of the foreseeable loads.[1][101] These experts have raised concerns about the motors possibly overheating in April 2019.[102]