B767-200
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Less Severe; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter Unstabilized Approach
Flight Crew Executed Go Around / Missed Approach
Aircraft
On arrival in the CVG terminal area; we were vectored onto the 36R localizer at NUYLI at 3000'MSL and cleared for the ILS 36R approach. Localizer and glideslope were intercepted normally. We were in IMC for the descent and approach. The approach was coupled with the center autopilot in command. Approximately 1.5-2NM outside the Final Approach Fix; the aircraft nose slowly veered to the right. I noticed the LOC had gone to a full scale left deflection and instructed the FO (First Officer) to disconnect the autopilot and attempt to re-intercept the final approach course. Passing the FAF; the localizer still indicated a full scale left deflection; so I initiated a go around. We called CVG Tower to inform him of the missed approach and executed the go around procedure. We were vectored around for a second attempt at the ILS 36R approach. The second approach was uneventful and the flight was terminated without incident.After takeoff; the FO reported a heavy right wing down rolling tendency in the aircraft. It was controllable; however; he used 5.5 units of right rudder trim to maintain straight and level flight. The flight proceeded normally all the way up to just before the FAF on the 36R ILS. I believe that as the aircraft slowed to final approach speed and landing flaps were set; the autopilot could not compensate for the 5.5 units of rudder trim; and the nose veered imperceptibly to the right. This caused the localizer tracking to fail; and we did not have enough time/space to reacquire the LOC before passing the FAF. During the go around; while hand flying the aircraft; the FO removed most of the rudder trim before re-engaging the autopilot. The aircraft flew the second approach; with approximately 2-3 units of rudder trim; just fine; and we landed the aircraft without further incident. I made a maintenance logbook entry regarding the excessive rolling tendency in the aircraft.
Flight Crew flying B767-200 aircraft encountered flight control anomaly requiring excessive trim.