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This Project Blue Book file, released through The Black Vault, covers the RB-47 encounter of 17 July 1957 over Mississippi, Louisiana, Texas and Oklahoma. It includes the record card, which lists the sighting as identified as American Airlines flight 655, and Air Defense Command correspondence that carried the sighting as unknown. There is also Major Lewis D. Chase's observer data sheet and an electronic analysis finding it difficult to conclude nothing was present. James McDonald's reconstructed account is included, along with a CAA letter about airliner incidents.
Read from the scan by GLM-OCR; expect the odd misread word.
ESTIMATED RANGE AT WHICH ALA-6 COULD DETECT SIGNAL FROM CPS-6B/FPS-10 RADAR VERTICAL CENTER BEAM AND ITS SIDELOBES AT RB-47 ALTITUDE OF 34,500 FEET. (Distances shown are as measured along surface of the earth and are not slant ranges.) Width of Main Beam = 10 db. down points Coma-Lobe = 16 db. down from Main Beam Lower Side-Lobe = 15 db. down from Main Beam Upper Side-Lobe = 22 db. down from Main Beam NOTE: Radar energy reflected off the ground may partially fill "gap" shown between lower sidelobe and main beam because of antenna's low elevation angle. The radar antenna is assumed to be aligned to horizontal although dish can be elevated slightly to clear local obstructions. ## MY THANKS TO THE FOLLOWING PERSONS AND ORGANIZATIONS FOR THEIR VALUABLE ASSISTANCE RB-47 crew members: Pilot Lewis D. Chase, ECM Monitor #2, Frank B. McClure, and ECM Monitor #1 John Provenzano... Elint specialist Rod Simons of the AIL Div. of Cutler-Hammer, which developed the APR-9 Elint receiver... George Rappaport, former technical director of USAF's electronic warfare laboratory at Wright-Patterson AFB, Ohio...Ken Klippel of Hoffman Electronics Corp., which produced the ALA-6... Tom Paganelli, Paul J. Teich and C.I. Robbins, of General Electric's Heavy Military Electronic Systems Dept., which produced the CPS-6B and FPS-10 radars... Dr. Maurer Maurer, chief of the Historical Research Div., Maxwell AFB, Ala., where the Project Blue Book UFO case files are archived... The Air Defense Command, which dug into ancient records to obtain information on the deployment of CPS-6B and FPS-10 radars in July, 1957,...American Airlines for doing the same to provide the scheduled arrival times for its Flt. #966 and #655 on July 17, 1957... Finally, the late Dr. James E. McDonald for his initiative in locating the original RB-47 case records in the Project Blue Book archives.
Document, cited by the archive. The PDF is mirrored here; the original link is above. The text was read from the page images by GLM-OCR; expect the odd misread word. 57 pages are in the text index: search them above, or from the library's search.