B767-200
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Troubleshooting
Aircraft Equipment Problem Less Severe
Flight Crew Returned To Gate; General Maintenance Action
Aircraft; Procedure
The FO (First Officer) performed the flight control check of the before takeoff checklist and noticed an unusual vibration/burble when the ailerons were operated. I confirmed this and we blocked back in and wrote up the issue as a vibration/burble in the control column when the control wheel was turned to the right. After trouble shooting with MX the issue appeared to be most severe when the right inboard aileron was operated with the flaps at 15. MX inspected the right inboard aileron and reported that one of the actuators; which appeared to have recently been installed; was almost completely lacking any lubrication. After lubricating this actuator the control operation improved.
B767 Captain reported aileron problems during the Before-Takeoff Checklist.