A Canadair aircraft experienced a catastrophic accident during landing due to a failed main gear. The gear repeatedly failed to lock down, leading to a downward lock and subsequent collapse. Subsequent touchdown resulted in a rightward veering and slow collapse of the right main gear. The left gear and nosegear sank into soft ground, causing the aircraft to come to rest with the tail and part of the left wing still on the runway. Lack of recovery equipment at Carrasco prevented removal, and the tail and nose were cut off. The aircraft was subsequently set alight, suggesting a deliberate act to clear the runway.A Canadair aircraft experienced a catastrophic accident during landing due to a failed main gear. The gear repeatedly failed to lock down, leading to a downward lock and subsequent collapse. Subsequent touchdown resulted in a rightward veering and slow collapse of the right main gear. The left gear and nosegear sank into soft ground, causing the aircraft to come to rest with the tail and part of the left wing still on the runway. Lack of recovery equipment at Carrasco prevented removal, and the tail and nose were cut off. The aircraft was subsequently set alight, suggesting a deliberate act to clear the runway.