sentences:  Silvertip just east-northeast of where the plane went down moments later.The cause of the crash is given in the official report as being the combination of several factors with the main ones being icing of the wings and fuselage and the loss of No.2 engine, but many questions remain, including why the aircraft turned away from Green 1 rather than toward it (reporting to ATC that it "was" on Green 1), and why this was picked up by neither the pilot nor First Officer despite spirit compasses and several radio aids-to-navigation on board which should have made the error rather obvious.