Flight Crew Multiengine; Flight Crew Flight Instructor; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Flight Crew Last 90 Days 0; Flight Crew Total 9600; Flight Crew Type 113
Training / Qualification; Situational Awareness
Ground Event / Encounter Loss Of Aircraft Control; Ground Excursion Runway
General None Reported / Taken
Aircraft; Human Factors
Piper PA-12 (tailwheel) airplane. I was seated in rear seat and pilot flying was seated in front seat. After landing on Runway XXL and all three tires on pavement; aircraft started to veer rightward off runway. Pilot corrected left; resulting in a wide left turn and the aircraft exited the runway perpendicular to the runway centerline and continued off into the grass; coming to a stop.
I was flying front seat in a PA-12 for a 30 minute familiarization flight.  [Other pilot] was in the backseat. I made a straight-in visual approach to RWY XXL at ZZZ. Landing was uneventful. During roll out; the aircraft turned away from centerline to the right. Rudder control forces were different from mine; and I over-corrected to the left. The aircraft left the runway on the left side and rolled down a hill; coming to an upright stop in tall grass. We reported to Tower immediately that no one was hurt; and the aircraft was OK. Vehicles came out to inspect; take reports (airport; FSDO (Flight Standards District Office); Sheriff; fire) and pull us back to the runway for start-up and taxi back to the hangar. Both pilots were fine. Maintenance inspection revealed only cosmetic damage to the underside of the aircraft. With all requirements met; no claims are being processed.
Pilot flying PA-12 aircraft departed runway during landing rollout.