Long lifespan

Twin Otter propeller interior
Jul 19, 2016

Aircraft lifespans can be measured by how many hours they’ve spent flying, or how many “cycles” they’ve done. Each cycle represents a successful take-off and landing, and generally gives a more accurate picture of the aircraft’s condition than just flight hours.

Amphibious Twin Otter Series 400
Jan 7, 2016

Between the original production by de Havilland and the new production by Viking up to the end of 2015, there are over 500 Twin Otters currently in operation worldwide.