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E-006715LANDMARK CASE · HIGH CORROBORATIONDATE PRECISION: exactRECORD COMPLETENESS: 100%

Topcliffe RAF Operation Mainbrace Object

September 20, 1952RAF Topcliffe, North Yorkshire, United Kingdom

RAF personnel reportedly saw a silver circular object about 15,000 feet over Topcliffe, initially behind a Meteor jet, then descending in a pendulum-like motion, rotating and accelerating away.

// LINKED CLASSIFICATIONS:Disc / Saucer(C-000253)→Scientific & Observational Types(P-000101)→Official Investigations & Programs(P-000105)→
Claims are displayed with the source wording, locator, relationship and verification state. Competing claims remain separate rather than being averaged into a single answer.
SOURCE COMPARISON

Encounter · Reported Encounter Observation

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CLAIM-695044reported
“RAF personnel reportedly saw a silver circular object about 15,000 feet over Topcliffe, initially behind a Meteor jet, then descending in a pendulum-like motion, rotating and accelerating away.”
The UFO Evidence
SRC-002107 · Topcliffe RAF Operation Mainbrace Object narrative; uploaded PDF pp. 236-237
SUPPORTS
SOURCE COMPARISON

Topcliffe Operation Mainbrace Circular Object (1952) · Hall Section X Foreign Reports Claim

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CLAIM-695045reported
“Hall cites Reuters and places the case during the NATO Operation Mainbrace maneuvers. Performance descriptions are visual/source estimates.”
The UFO Evidence
SRC-002107 · Topcliffe Operation Mainbrace Circular Object (1952) source description; uploaded PDF pp. 236-237
SUPPORTS
SOURCE COMPARISON

Hall Foreign Reports Dossier · Hall Section X Foreign Reports Claim

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CLAIM-695001reported
“Hall introduces Section X as a survey intended to show that UFO reports, official investigations and private study groups were international rather than uniquely American.”
The UFO Evidence
SRC-002107 · Section X introduction and survey framing; uploaded PDF pp. 226-226
SUPPORTS
SOURCE COMPARISON

Hall Europe Foreign Reports Dossier · Hall Section X Foreign Reports Claim

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CLAIM-695007reported
“Hall says the Swedish defense ministry reported that about 80 percent of roughly 1,000 ghost-rocket reports were attributed to celestial phenomena while some radar detections remained outside those categories.”
The UFO Evidence
SRC-002107 · Swedish ghost-rocket investigation summary; uploaded PDF pp. 234-235
SUPPORTS
CLAIM-695008reported
“Hall reports that the British Air Ministry investigated UFO reports but refused to release details of specific radar and aviation cases, citing defense responsibilities.”
The UFO Evidence
SRC-002107 · British Air Ministry correspondence; uploaded PDF pp. 236-236
SUPPORTS
CLAIM-695009reported
“Hall reports a 1963 West German Embassy reply saying there was no official West German UFO policy or agency, while the attaché considered the subject insufficiently explored.”
The UFO Evidence
SRC-002107 · West German Embassy reply and Damm survey; uploaded PDF pp. 239-240
SUPPORTS
Multiple claim rows are intentionally retained when sources disagree. ANOMALY does not silently reconcile competing values.