A Twin Otter aircraft experienced a catastrophic failure during final approach, resulting in a collision with a terminal building and a vehicle. The pilot attempted to regain control using throttle and flap controls, but the flight control system failed, leading to a nose pitch-up. Corrosion, accelerated by high humidity and marine salt, was identified as a contributing factor. The presence of large quantities of salt pork and corned beef in the cargo compartment further exacerbated the situation.A Twin Otter aircraft experienced a catastrophic failure during final approach, resulting in a collision with a terminal building and a vehicle. The pilot attempted to regain control using throttle and flap controls, but the flight control system failed, leading to a nose pitch-up. Corrosion, accelerated by high humidity and marine salt, was identified as a contributing factor. The presence of large quantities of salt pork and corned beef in the cargo compartment further exacerbated the situation.