Caravan Undifferentiated
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Commercial
Flight Crew Last 90 Days 150; Flight Crew Total 700; Flight Crew Type 200
Situational Awareness; Training / Qualification
Ground Event / Encounter Loss Of Aircraft Control; Ground Event / Encounter Object; Ground Excursion Runway
Aircraft Aircraft Damaged
Human Factors
Upon landing in a Caravan Cessna 208 with eight passengers on board; pilot in command was executing a coupled approach in VMC; unlimited ceiling; unlimited visibility; zero wind conditions. After disengaging the autopilot on the coupled approach approximately 300 feet off the ground; he hand flew and started to immediately drift to the left of centerline. Approximately 10 feet above the numbers he flared; and the speed was below 80 kts.  Stall warning horn went off for about one second and we landed harder than normal. After touchdown he started to over-correct towards the centerline; while doing this the aircraft started to veer to the right and he was not able to regain control. The airplane then went off into the grass; hit a sewage drain and blew out a tire.There were no injuries. The Tower asked us if we needed assistance; I said yes we will need a tow. At no time did I interfere with the landing or grab the controls.In my opinion he let the airspeed get too low; considering the amount of weight that we had on board; and he flared too soon/too high. That; combined with the weight on landing; [and] the momentum of his overcorrection led to the skating off the runway.
Cessna Caravan FO reported the flying pilot lost directional control after a hard landing; went off the runway; and struck a drain; resulting in a flat tire.