> Investigators discovered upon their arrival that someone had made off with the spring and end cap, but at the time they did not know the significance of this

> Investigators discovered upon their arrival that someone had made off with the spring and end cap, but at the time they did not know the significance of this act. The NTSB and Parker Bertea replaced the spring, the end cap, and several other parts that were ruined in the crash and began running tests on the valve. Nothing abnormal was found. Boeing, which had packed the valve for shipping, did not explain why it kept the spring and the end cap. It instead tried to steer the NTSB toward a conclusion that the crash was caused by a wind rotor, a phenomenon similar to a sideways tornado that could sometimes be found along the Rocky Mountains. Is this true?