De Havilland DHC-6 Twin Otter crash, Jun 21, 1990 (2 killed)
De Havilland DHC-6 Twin Otter accident on June 21, 1990 near Thistle Lake, Northwest Territories, Canada with 2 fatalities.
- Date: June 21, 1990
- Aircraft: De Havilland DHC-6 Twin Otter
- Location: Thistle Lake, Northwest Territories, Canada
- Fatalities: 2
- Phase of flight: Takeoff and climb
A Ptarmigan Airways Twin Otter 300 departed Thistle Lake, Northwest Territories, on 21 June 1990 after a cargo delivery for mine workers. Shortly after liftoff it banked right and struck the rotor of a parked Bell 206 helicopter, then crashed a few dozen metres away and burned, killing both pilots.