De Havilland DHC-6 Twin Otter crash, Jun 18, 1986 (20 killed)
De Havilland DHC-6 Twin Otter accident on June 18, 1986 near Grand Canyon, Arizona, USA, United States with 20 fatalities.
- Date: June 18, 1986
- Aircraft: De Havilland DHC-6 Twin Otter
- Location: Grand Canyon, Arizona, USA, United States
- Fatalities: 20
Grand Canyon Airlines DHC-6 Twin Otter N76GC (Canyon 6) on a sightseeing flight collided at about 6,500 feet over Grand Canyon National Park with Helitech Bell 206 N6TC (Tech 2), also on a sightseeing flight. The helicopter's main rotor struck the Twin Otter's tail and nose gear and both aircraft crashed. All 25 aboard died: 20 on the Twin Otter and 5 on the helicopter.