LOU wrote on Jun 28^th, 2011 at 12:07am:

Who want to tell me what a balance panel is in a 707, or a 727?  :-/

Well, the balance panel (fitted on the 707 and 727 inboard ailerons) is a small surface hinged at the trailing edge of the inboard aileron's surfaces, which aerodynamically forced the deflection of the aileron the opposite way, thereby achieving a means of aerodynamic control, i.e. in case of hydraulic failure. If the balance panel moved up, the aileron went down, and vice-versa.

LOU, sincerely I didn't know the answer. I searched and found on Google. :)