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This file concerns the October 10, 1933 crash of United Air Lines Trip 23, a Boeing 247 registered NC13304. The FBI investigated reports that an explosion or bomb may have caused the aircraft to break up, while coordinating with Navy and aviation officials examining the wreckage. The records include agent reports, witness and relative interviews, correspondence, a 1934 interview with pilot Thornton M. Larrod, and descriptions of aircraft-compartment photographs and a crash-site map. A November 1933 memorandum says observers and experts believed an explosion of unknown origin occurred before the crash and noted that gas vapors were a possible cause.

FBI file number: 62-29755 | Documents span: 1933-1934 | Released in 1 part
Names in this file: Thornton M. Larrod, E. M. Dwyer, Ed. Kenny, W. H. Kennedy, T. N. Stapleton
Subjects: aviation accident, United Air Lines, Boeing 247, explosion investigation, FBI investigation