Aircraft Accident Investigation Summary Report V116/783/1047: Disappearance of Cessna 182L VH-DSJ

This document is a comprehensive file from the Australian Department of Transport regarding the disappearance of Cessna 182L aircraft VH-DSJ, piloted by Frederick Valentich, on October 21, 1978. The pilot was on a private flight from Moorabbin to King Island when he reported encountering an unidentified aircraft or object. During his final radio transmissions to the Melbourne Flight Service Unit, Valentich described a large, metallic, shiny object with a green light that was orbiting his aircraft. He reported that the object was hovering above him and that it was 'not an aircraft.' Shortly after these reports, the pilot noted that his engine was idling roughly, and radio contact was lost at 1912 hours. An intensive search of the Bass Strait area was conducted, but no trace of the aircraft or the pilot was ever found. The file includes the official Aircraft Accident Investigation Summary Report, which concludes that the cause of the disappearance could not be determined. The file also contains extensive correspondence, investigator notes, and internal memos documenting the investigation process, including the analysis of an engine cowl flap found on Flinders Island in 1983, which was identified as potentially belonging to the missing aircraft. The investigation also explored the pilot's background, including his interest in UFOs and his academic performance, as well as media speculation and public interest in the case. The Department of Transport maintained that there was no evidence to support the pilot's claims of an unidentified object and that the investigation was focused on accident prevention rather than determining blame or liability.