After inspection, it became apparent that the type and its design were sound; most of the accidents were due to pilots' often grave violations of flight regulations, and the fact that all airframes were well worn by the end of the 1950s. The other problem was the engines.
Following inspection, it became clear that the aircraft's design and construction were sound; most accidents were caused by pilots violating flight regulations, and the fact that all planes were worn out by the end of the 1950s. Another problem was the engines.