Within 24 hours of the accident Catastrophe , the United States Department of Commerce ( the governing Action authority of the CAA ) ordered Request that all Lockheed Super Electras be immediately grounded Motion and that tests be performed Action to confirm that the figures obtained Getting in the aircraft 's original vibration tests were accurate .

The Department ordered Request that the rudders of all Super Electras be modified Change so as to eliminate Removing the possibility that flutter Motion would cause Causation an in-flight break-up Destroying .

These accidents , as well as two others which befell Self_motion Northwest Airlines Super Electras in 1938 , called into question the airworthiness and commercial potential of the model .

Northwest Airlines sold Commerce_sell off its fleet of Electras soon after this accident .