Date: 201508
Local time of day: 1201-1800
Location: ZZZ.Airport, US
Flight conditions: VMC
Light: Daylight
Aircraft: Gulfstream G200 (IAI 1126 Galaxy)
Operator: Air Taxi
Operating under: Part 135
Flight plan: IFR
Mission: Passenger
Flight phase: Takeoff / Launch
Airspace: Class C ZZZ
ATC / advisory: TRACON ZZZ; Tower ZZZ
Aircraft component: Rudder Trim System
Component problem: Improperly Operated
Reporter organization: Air Taxi
Reporter function: Captain; Pilot Flying
Reporter qualification: Flight Crew Air Transport Pilot (ATP)
Human factors: Other / Unknown
Second reporter function: Pilot Not Flying; First Officer
Anomaly: Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance
Detector: Person Flight Crew
When detected: In-flight
Result: Air Traffic Control Issued New Clearance; Flight Crew Became Reoriented; Flight Crew Returned To Clearance
Contributing factors: Aircraft; Human Factors
Primary problem: Human Factors

Narrative: During the takeoff roll; at rotation; the aircraft turned to the right. I pitched slightly forward to gain airspeed. The aircraft kept turning to the right and we asked the controller for a new heading. As I wasn't able to turn the aircraft to the left and being at a safe altitude; I briefly transferred controls to my partner to see if he would have a better result; which he did not. As soon as I did this I scanned the trims and observed the rudder trim well to the right of center. I called this out to my partner; took the controls back. He centered the trim; restoring normal flying characteristics. We got amended departure instructions from Departure and continued on to destination.There were several factors that contributed to this event. The departure FBO had so many lineman coming to the airplane there were many more interruptions than normal. Three lineman brought the catering; three lineman were involved in servicing the lavatory; etc. The suggestion here is to have a personal method of managing interruptions; whether that means starting the checklist over or going back to a point that has obviously been completed. Checklist 'mindfulness' is also all important.


Second narrative: Shortly after takeoff my partner informed me that he was having difficulties controlling the aircraft to the left and we can only turn right. I informed ATC and they assigned use a new heading. Able to reach a safe altitude we transferred controls and I was also having difficulty holding a heading. During that time my partner identified the rudder trim was out of balance to the right. Transferring the controls back he had me retrim the rudder back to the center. Having full control of the aircraft back we asked to continue with the flight.Managing the check list items while multiple of other things are happening. Read the item; look to see and confirm it's correct.


Synopsis: At some point during preflight and passenger boarding; a G200 flight crew reports the rudder trim becoming adjusted far to the right. This is not detected prior to takeoff resulting in difficult handling for the pilot flying. Once level at 3;000 feet the cause is detected and corrected.