When the aircraft was rolling Motion for take-off Self_motion , the pilot felt Perception_active a strong and worsening vibration and aborted Process_end the take-off .

The cause Causation of the accident was the detachment of fragments from a recapped tread on the right wheel of the nose gear , creating Creating a strong vibration .

Standard procedure calls for takeoff Self_motion to continue after V1 , and the pilots initially followed such ; however , the vibration severely worsened upon rotation , and so , not knowing Know the cause of the vibration , the captain aborted Process_end the takeoff , despite having passed Motion_directional Vr .

Standard procedure calls for takeoff Self_motion to continue after V1 , and the pilots initially followed such ; however , the vibration severely worsened upon rotation , and so , not knowing Know the cause of the vibration , the captain aborted Process_end the takeoff , despite having passed Motion_directional Vr .

The inquiry Scrutiny attributed Causation the blade fracture to metal fatigue , caused Causation by heavy vibration in the newly upgraded Cause_to_make_progress engines , which had been tested Testing only in the laboratory and not under representative flight conditions .

Several comprehensive studies Research on the total structural failure of this building were conducted Action with a focus on how the building responded Response to the earthquake Catastrophe 's vibration .

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 .

It was discovered Know that the machine used Using by Lockheed ( and authorized Agree_or_refuse_to_act by the Department of Commerce ) to measure the natural vibration periods of the component parts of the aircraft had given Giving Lockheed engineers misleading results .