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glimmerkkp
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The Civil Aeronautics Board concluded that the primary cause of the crash was pilot error due to Peterson's inability to accurately interpret the plane's Sperry F3 attitude indicator which he was forced to rely upon in the prevailing weather conditions. The theory is that Peterson may have read the unusual gyroscope as though it was a conventional gyro and thought that the plane was gaining altitude when it was actually descending; resulting in him encountering spatial disorientation while airborne. Peterson was not certified to fly solely by reference to instruments. A secondary factor was that the pilot had not been informed of adverse flash weather forecasts.