An aircraft comprising an adaptive trailing edge system comprising: an adaptive trailing edge element mounted to a trailing edge of an aircraft wing; an electric motor actuator including an electric motor mounted to a trailing edge structure of the trailing edge, the electric motor configured to actuate the adaptive trailing edge element; a linkage system coupling the electric motor actuator to the adaptive trailing edge element for actuation thereof; a damper mounted to the trailing edge structure and coupled to the adaptive trailing edge element wherein the damper is configured to dampen vibrations or flutter that may be aerodynamically induced in the adaptive trailing edge element; characterized by further comprising: a power-off brake configured to prevent rotation of the electric motor when the power-off brake is applied; and further characterized in that the linkage system comprises a slider mechanism including: a bellcrank pivotable about a bellcrank pivot axis, the bellcrank pivot axis oriented generally transverse to a hinge axis of the adaptive trailing edge element; a connector link coupled to the bellcrank at a bellcrank-connector joint; a slider link coupled to the connector link at a connector-slider joint, and the slider link passing through a trailing edge spar and being coupled to the adaptive trailing edge element. an adaptive trailing edge element mounted to a trailing edge of an aircraft wing; an electric motor actuator including an electric motor mounted to a trailing edge structure of the trailing edge, the electric motor configured to actuate the adaptive trailing edge element; a linkage system coupling the electric motor actuator to the adaptive trailing edge element for actuation thereof; a damper mounted to the trailing edge structure and coupled to the adaptive trailing edge element wherein the damper is configured to dampen vibrations or flutter that may be aerodynamically induced in the adaptive trailing edge element; characterized by further comprising: a power-off brake configured to prevent rotation of the electric motor when the power-off brake is applied; and further characterized in that the linkage system comprises a slider mechanism including: a bellcrank pivotable about a bellcrank pivot axis, the bellcrank pivot axis oriented generally transverse to a hinge axis of the adaptive trailing edge element; a connector link coupled to the bellcrank at a bellcrank-connector joint; a slider link coupled to the connector link at a connector-slider joint, and the slider link passing through a trailing edge spar and being coupled to the adaptive trailing edge element. a power-off brake configured to prevent rotation of the electric motor when the power-off brake is applied; and further characterized in that the linkage system comprises a slider mechanism including: a bellcrank pivotable about a bellcrank pivot axis, the bellcrank pivot axis oriented generally transverse to a hinge axis of the adaptive trailing edge element; a connector link coupled to the bellcrank at a bellcrank-connector joint; a slider link coupled to the connector link at a connector-slider joint, and the slider link passing through a trailing edge spar and being coupled to the adaptive trailing edge element. a bellcrank pivotable about a bellcrank pivot axis, the bellcrank pivot axis oriented generally transverse to a hinge axis of the adaptive trailing edge element; a connector link coupled to the bellcrank at a bellcrank-connector joint; a slider link coupled to the connector link at a connector-slider joint, and the slider link passing through a trailing edge spar and being coupled to the adaptive trailing edge element.