THE history of the development of instrument landing extends back a dozen years. In 1928 the National Bureau of Standards began work on a system for the Aeronautics Branch of the Department of Commerce. Using this system, Lt. James H. Doolittle on September 23, 1929, made the first successful instrument landing in history.
(1940), "Instrument Landing in the U.S.A.: The Physical Equipment and Method of Operation of the Indianapolis System", Aircraft Engineering and Aerospace Technology, Vol. 12 No. 12, pp. 370-372. https://doi.org/10.1108/eb030724Download as .RIS
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