De Havilland DHC-6 Twin Otter crash, Mar 29, 1977 (13 killed)
De Havilland DHC-6 Twin Otter accident on March 29, 1977 near Bainaha Valley Central Sulawesi, Indonesia with 13 fatalities.
- Date: March 29, 1977
- Aircraft: De Havilland DHC-6 Twin Otter
- Location: Bainaha Valley Central Sulawesi, Indonesia
- Fatalities: 13
- Phase of flight: En route
A Merpati Nusantara Twin Otter flying a tourist charter from Palu to Tolitoli hit a cliff-top ridge after the crew descended to show passengers the scenery. The aircraft stalled and fell into a ravine, and ten of the 23 occupants survived.