 On October 19, 1959, a Boeing 707-227 crashed on the banks of the Stillaguamish River's North Fork during a test flight, killing four of eight occupants.The plane, being flown by Boeing test pilots instructing personnel from Braniff International Airways, lost three engines and suffered a fire in the fourth after a dutch roll had been executed beyond maximum bank restrictions.The plane made an emergency landing in the riverbed while unsuccessfully trying to reach a nearby open field.