About 50,000 hours of V.-G data obtained from one type of four-engine civil transport airplane operated over three different commercial airline routes of the United States from 19^9 to 1953 are analyzed to determine the magnitude and frequency of occurrence of gust loads and gusts. The normal-acceleration increments for each of the three operations equaled or exceeded the limit gust load factor, on the average, twice (once positive and once negative) in about 1.0 X 10 6 flight miles. A derived gust velocity of 50 feet per second (evaluated on the basis of NACA Technical Note 2964) was equaled or exceeded twice in about 0.5 x 10" flight miles for each of the three operations. The frequency of occurrence of the gust loads and the gusts for the present operations is in general agreement with those from similar operations of other civil transports recently investigated.nThe data were examined for possible bias by maneuvers, since time-history records from other operations had indicated that the maximum positive accelerations in V-G records might be so biased, but no clearly defined effects of maneuvers could be discerned in these data.
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