Cessna 188 (Ag Wagon/Ag Truck/Ag Husky)
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 15; Flight Crew Total 2550; Flight Crew Type 394
Ground Excursion Ramp; Inflight Event / Encounter Loss Of Aircraft Control
General None Reported / Taken
Aircraft
Unexplained right swerve on rollout could not be corrected by full control deflection and aircraft departed the runway.
Cessna T188 pilot reported unexplained loss of directional control on landing roll that resulted in a runway excursion.