Belgian Air Force pilots (1989-1990 wave)
Before the sighting
The Belgian UAP wave began on the evening of November 29, 1989 in the eastern Belgian municipalities of Eupen and Verviers, with multiple Gendarmerie (national police) officers among the early witnesses reporting a large, low-altitude, silently-hovering triangular craft with three downward white lights and a central red pulsing light. Over the following five months, more than 2,000 witness reports were collected. Belgian Air Force radar stations at Glons and Semmerzake registered anomalous returns on multiple occasions. The Belgian Air Force consulted with NATO partners and put F-16s on alert.
During the sighting
On the night of March 30-31, 1990, ground radar at Glons and Semmerzake registered an anomalous high-mobility target; the Belgian Air Force scrambled two F-16s from Beauvechain airbase, piloted by Capt. Yves Meulenbergs and Capt. Frank de Greef. Over approximately 75 minutes, the pilots reported obtaining radar lock-on nine times; each lock was broken within seconds by the target performing maneuvers the F-16 radars recorded as accelerations on the order of 40g and altitude changes of thousands of feet in seconds. The pilots did not obtain visual contact. The Belgian Air Force preserved the radar tapes and pilot interview transcripts and released them publicly at a press conference convened by then-Colonel De Brouwer on July 11, 1990, in Brussels — explicitly inviting civilian investigators (SOBEPS) and the press to examine the data. De Brouwer's stated position in 1990 and reiterated in 2010 was that the Belgian Air Force could not identify the object, could not rule out an unconventional craft, and had no further hypotheses to offer.
After the sighting
SOBEPS continued analysis through the early 1990s; physicist Auguste Meessen produced the principal scientific analysis of the F-16 radar tapes, concluding that some returns showed kinematics inconsistent with conventional aircraft but acknowledging that radar artifacts could explain some but not all of the data. In 2011, Belgian engineer Patrick Marechal confessed publicly (on RTL-TVI) that the iconic 'Petit-Rechain' photograph of a triangular craft, taken April 4, 1990, was a hoax he and a friend had made from a small model. This confession is independently confirmed. However, the radar-pilot incident of March 30-31 was wholly separate from the Petit-Rechain photograph in evidentiary chain — they share only the time period — and the Marechal confession does not impeach the radar data or the pilot reports. In 2010 De Brouwer contributed the Belgian chapter to Leslie Kean's book. SOBEPS dissolved in 2007 and was succeeded by COBEPS.
Research notes
Score 8.5 reflects exceptionally strong institutional integrity: career military officers in a NATO air force, contemporaneous radar data, public official data release in 1990 (an event nearly unique in UAP history), independent civilian scientific analysis (SOBEPS/Meessen), and 35+ years of consistent on-record testimony from De Brouwer. The case is one of the very few where 'all the primary government records were publicly released' is true. The Petit-Rechain hoax is correctly separate from the core case — it impeaches one photograph, not the radar tapes or pilot reports. I have not scored 9-10 because: (a) the F-16 pilots never obtained visual confirmation; (b) the radar data, while consistent across multiple stations and the airborne intercept, has a legitimate (though contested) alternative explanation in atmospheric anomalous propagation; (c) no trace evidence; (d) the Belgian Air Force's own final conclusion was 'unidentified', not 'extraterrestrial' — the institutional restraint is itself credibility-positive, but it means the case is 'high-confidence unexplained' rather than 'high-confidence ET.' One factual correction relative to the brief: Kean's edited volume was published in 2010, not 2007.