IncidentThe RB-47 ELINT Incident (17 July 1957)

aka The RB-47 ELINT Incident (17 July 1957)

On 17 July 1957, a USAF RB-47H electronic-reconnaissance jet was paced for roughly 1.5 hours and ~700 miles across the southern US by an object simultaneously seen by the cockpit crew, picked up by the plane's onboard ELINT monitors at ~2,800 MHz, and tracked by ground radar - reportedly blinking off all three sensor channels at the same instant - routinely cited as one of the best instrumented multi-sensor military UFO cases and classified 'unexplained' by the Condon Committee.

under-corroborated Reclassified from phenomenologically-open to under-corroborated on a 2026 adversarial re-audit. The compelling tri-sensor simultaneity rests entirely on crew recollection 10-12 years later, with the original ELINT tapes, GCI scope film, and any official report all lost, and a live S-band ground-radar counter (Klass/Printy) only partially rebutted by Sparks - compelling but unverifiable, not confirmed-anomalous. 'Open' would assert a verified instrumented anomaly; the honest position is documentary thinness and decade-later (or unreleased) hard data, so the case is held under-corroborated - genuinely unresolved, but not instrumented-and-confirmed.

status history (2)

2026-06-14 · new → phenomenologically-open — seeded 2026-06-14 — corpus-growth pass (foundational ELINT/radar case)

2026-06-14 · phenomenologically-open → under-corroborated — adversarial re-audit of the strongest open instrumented cases — The compelling tri-sensor simultaneity rests entirely on crew recollection 10-12 years later, with the original ELINT tapes, GCI scope film,

▸ Deep dive — full timeline, named personnel, sensors, theory-by-theory analysis, and the conventional explanations weighed against the open questions →

An RB-47H out of Forbes AFB, Topeka, with a six-officer crew, flew a composite training mission across the south-central US. ELINT operator Frank McClure detected a strong ~2,800 MHz S-band signal that, instead of behaving like a fixed ground radar, appeared to orbit and pace the 500-mph aircraft; the crew visually observed a bright bluish/reddish-white light (pilot Lewis Chase reported a light ‘bigger than a house’); and ground radar at Duncanville, Texas confirmed a return at the same bearing. The hallmark: the object reportedly ‘blinked out’ and vanished from the ELINT scope and ground radar simultaneously, then reappeared on both at once. Project Blue Book initially explained it as commercial airliners, which the Condon Committee’s own radar analyst Gordon Thayer called ‘literally ridiculous,’ rating it unexplained; atmospheric physicist James McDonald interviewed all six crewmen and championed it. Skeptic Philip Klass argued the ELINT was ground-radar confusion plus anomalous propagation and the visual a meteor or airliner - contested, since it strains to explain the simultaneity across three independent sensor types. The corpus’s early Cold-War multi-modal sensor keystone, uniquely adding the ELINT dimension.

Notable & intriguing

The object was reportedly detected on three independent channels at once - the crew’s visual, the RB-47’s onboard ELINT at ~2,800 MHz (behaving as an emitter orbiting a 500-mph aircraft, which a fixed ground radar cannot), and ground radar at Duncanville, TX - and ‘blinked out’ of the ELINT and ground radar simultaneously.

James McDonald (crew interviews); Condon Report / Gordon Thayer
The Condon Committee’s own radar analyst Gordon Thayer called Blue Book’s airliner explanation ‘literally ridiculous’ and rated the case unexplained; skeptic Philip Klass’s anomalous-propagation counter is contested on its key factual premise (whether a confusable ground radar was even operating).

Condon Report; Philip Klass; Brad Sparks / Tim Printy debate

Public-record items already documented about this subject. Folklore is labelled. Sources cited where the specificity warrants it.

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