# Frederick Valentich: the missing aircraft and the radio record Eklipsis original editorial investigation · English · edition 1 · 2026-09-29 A pilot disappeared during a flight toward King Island after reporting an unusual aircraft. The central evidence is an aviation investigation file and its communications record, with a cause left undetermined. Country: Australia Date: 21 October 1978 Location: Cape Otway / Bass Strait Cape Otway is a route reference. This marker does not locate a wreck or establish the final position of the missing aircraft. ## Assessment Aircraft disappearance documented; the cited investigation did not determine its cause. ## Incident brief Frederick Valentich disappeared on 21 October 1978 while flying a Cessna toward King Island over Bass Strait. During radio communication he reported an unusual aircraft. The Department of Transport investigation did not determine the reason for the disappearance. The surviving file is valuable because it preserves the inquiry and communications material; it is not a recovered aircraft or a direct observation from outside the cockpit. [F1] [F2] [F3] ## The record and its copies Use the National Archives item identifier to anchor provenance. The large PDF is a third-party mirror of government material, not an independently produced corroborating report. A documentary can help contextualise the people and history, but dramatic narration must not be substituted for the file’s wording. Keep original transcript, later interview and editorial reconstruction explicitly distinct. [F1] [F2] [F4] ## Inspector’s assessment Separate what the pilot says he perceives from what the ground operator can independently confirm. Then separate the loss of radio contact from the reason for it. A communication transcript can document concern, descriptions and timing without establishing the external object’s dimensions, range or identity. The absence of a recovered cause does not validate the most striking explanation. ## Geography and uncertainty Cape Otway and the route toward King Island orient the reader. They cannot be converted into a precise crash point using this dossier alone. A reconstruction needs position reports, time standard, heading, airspeed, wind and uncertainty. Where an input is missing, show a range or leave the track incomplete. The case concerns a real missing person; no invented last words, private details or unsupported accusation is needed to make the uncertainty clear. ## Documentary chronology 21 October 1978 — The flight and loss of communication lead to a missing-aircraft investigation. [F1] [F2] After the loss of contact — Search and inquiry material accumulates in the Transport file. [F2] 1982 — The investigation summary records that the cause could not be determined. [F2] [F3] Later archival access — The government file and subsequent historical programmes become available through different channels. [F1] [F4] ## Evidence ledger Reported in the communications record — The pilot reported an unusual aircraft before contact was lost. [F2] Not established — The investigation established an extraterrestrial cause. [F2] [F3] Incorrect provenance interpretation — A third-party scan is a second independent investigation. [F1] [F2] ## Hypothesis review An aviation accident with perception or orientation contributing — Candidate class Support: A loss of aircraft can be investigated through navigation, aircraft and human factors. Limits: Without decisive physical evidence, a particular causal chain remains unconfirmed here. Discriminating test: Compare proposed sequences with contemporaneous communications and flight constraints. An encounter with another aerial source — Reported perception, identity unresolved Support: The pilot’s description motivates checking the external environment. Limits: A verbal description does not establish range, size or agency. Discriminating test: Seek independent air-traffic or witness records with matching times and geometry. ## Inspector tasks Audit the transcript Use the file copy, record page numbers and distinguish speech from editorial annotations. Retain uncertainty markers and do not replace missing audio with a dramatization. Build a bounded route model List every required navigation input and its source. Keep the last reported position distinct from a calculated position and any speculative wreck location. Index the investigation file Identify the summary, correspondence and search documents by sheet. Record duplicate pages and later additions so file size is not mistaken for independent corroboration. ## Source register [F1] National Archives of Australia: item 10491375 Archive catalogue · en Department of Transport file B1497, V116/783/1047. Archive viewer availability may vary. https://recordsearch.naa.gov.au/SearchNRetrieve/Interface/DetailsReports/ItemDetail.aspx?B=10491375 [F2] Department of Transport file — digitised mirror PDF · government file, third-party mirror · en Large scan, about 67 MB. Linked at source rather than repackaged; verify cover reference and relevant sheets. https://documents.theblackvault.com/documents/ufos/australia/B1497_V116-783-1047_10491375.pdf [F3] Aircraft investigation summary, archive image 8 Archive page viewer · en Page-level entry point for the investigation summary. Viewer numbering is not necessarily printed foliation. https://recordsearch.naa.gov.au/NAAMedia/ShowImage.asp?B=10491375&S=8&T=P [F4] ABC History Listen: Last Light — the Valentich disappearance Audio · retrospective documentary · en Interviews and historical context. A modern programme is not the original aviation radio recording. https://www.abc.net.au/listen/programs/the-history-listen/the-history-listen-valentish-lost-plane-ufo/102960720 ## Authorship and access The English synthesis, assessment and working sheets are original Eklipsis editorial work. Source documents retain their named authors and rights. Catalogue entries, mirrors and alternate formats are labelled; they are not counted as independent corroboration. The source register records links, not a claim that every underlying archive has been fully retrieved.