All aircraft tripod jacks must be level for proper operation. In addition, the aircraft must be raised and lowered in a level attitude. Excessive side loading is the primary cause of tripod jack bearing wear or failure. Many tripod jacks, especially for wide body aircraft, include adjustable swivel feet for leveling the jack prior to operation. For hangar floors with excessive slope, tripod jacks with adjustable swivel feet should be used. As an option, aluminum shim plate kits (with various thicknesses) can be used under the jack foot pads. For additional information, please contact firstname.lastname@example.org.