Like most flight instructors giving dual instruction, Reid was seated on the right side, while the aircraft's primary flight instruments were mounted on the left, in front of Dubroff in this case. Investigators speculated that because of the heavy rain in his immediate climb path, Reid's forward visibility became greatly restricted. To maintain control through the climbing right turn, he would have had to turn his head to the left to see the flight instruments (most critically the attitude and airspeed indicators) and to the right to see the ground through the side window. Such side-to-side head motion, combined with the worsening flight visibility during the climb and the reduced stall margin, could have led to spatial disorientation and loss of control.