B757-200
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Flight Crew Total 17500
Aircraft Equipment Problem Less Severe
Flight Crew Returned To Gate
Aircraft
During our Flight Control check; the ailerons rolled 6 units to the right when the Yoke was released. Numerous attempts were made to do a successful Flight Control check; but each time the ailerons would consistently roll to the right when released. In discussing the issue with the mechanic on the headset; it was thought that perhaps the strong 30 knot quartering tailwind might be causing the problem. Therefore it was decided to [reposition] and attempt another Flight Control check once the aircraft was positioned differently in regards to the strong surface winds. With the aircraft facing different directions on both the ramp and the taxiway; multiple Flight Control Checks were attempted. Each time the ailerons would roll uncommanded to the right when the control yoke was released. In addition; the controls then became difficult to manually move back to the left. In discussing the matter with both our Dispatcher and Maintenance Control; it was decided to return to the gate.
B757 Captain reported the ailerons consistently rolled right after releasing the yoke during the off-gate flight control checks.