>If the bolt can rotate with the control surface, it has to be secured with >a castle nut and cotter pin. When the bolt clamps the hinge together onto >a bearing, the bolt does not rotate with the control surface >movement. Most certificated airplanes use ball bearing equipped hinges; >hence, lock nuts are appropriate. >Don Reid - ++++++++++++++++++++++++++++++++++++++++++++++++++++
As I recall the control surfaces rotated on bearings but I guess maybe these bolts just weren't tight enought as they would sometimes rotate with the control surface movement. Larry Flesner
