Chile.Chilean Navy helicopter

On November 11, 2014, at 13:52, a Chilean Navy AS532 Cougar helicopter was on a training flight at approximately 4,500 feet off the coast of Valparaíso. The crew (a captain pilot and a technician operator) detected with the WESCAM MX-15 system, a gyro-stabilized camera with an infrared (FLIR) channel, an object over the ocean that the crew estimated at about 35 to 40 miles (55 to 65 km). The operator filmed it for 9 minutes and 12 seconds continuous before losing it.

According to the report CEFAA released, both crew members also saw it with the naked eye, and it seemed to them to fly at about the same speed and altitude as the helicopter, heading west-northwest. In the infrared video, the object displayed an elongated shape with what looked like lateral appendages and, at two moments, intense thermal discharges emitted to the sides (the celebrated hot 'plumes'). The object finally entered a cloud formation, where contact was lost. The crew alerted the coastal radar station and Santiago air traffic control: neither detected the object on radar, though both picked up the helicopter, and the controllers confirmed that no civilian or military traffic had been reported in the area and no aircraft was authorized in the controlled airspace where the object was.

The Navy referred the material to CEFAA (Comité de Estudios de Fenómenos Aéreos Anómalos), under the DGAC. The Director General of Civil Aeronautics authorized a formal investigation that ran for more than two years and consulted the DGAC, the Chilean Air Force, the Navy, ENAER, the Chilean Meteorological Directorate, astronomers, physicists and French analysts from GEIPAN. The Air Force analysts concluded it was a real three-dimensional form with volume that "has control in its movements" and was not affected by the winds. The French analysts confirmed the helicopter flew at a constant 120 knots, that the object was on average about 55 km away, almost exactly the Navy's estimate, and that it kept pace with the helicopter; but they proposed it was a medium-haul aircraft landing at Santiago, with the two hot spots spaced like jet engines and the 'plumes' explained by dumping cabin waste water carried by the west wind. The Chilean experts rejected that reading: radar would have detected the plane, it would have needed landing clearance and the pilot would have recognised it. Aircraft, weather balloons, drones, birds, insects, parachutes, hang gliders, space debris re-entry and hoaxes were ruled out; a Navy admiral reported there were no joint naval exercises with the US or any other country, and the conclusion published in January 2017 was that "the great majority of committee members agreed to call the subject in question a UAP (Unidentified Aerial Phenomenon)"; General Ricardo Bermúdez summed it up: "We do not know what it was, but we do know what it was not." CEFAA publicly released the full FLIR video and report.

What happened after publication changes the case. Independent analysts on the Metabunk forum, led by Mick West, reconstructed the geometry from the helicopter's position and heading and proposed that the object was a climbing commercial aircraft whose two thermal 'plumes' corresponded to semi-persistent aerodynamic contrails (cooler than the engines, similar in infrared to dense clouds). The candidate most consistent with the trajectory, time and position was Iberia flight IB6830, a four-engine A340 departing Santiago: using its ADS-B track, the aircraft is in the right place and direction, banks when the "UFO" banks, and its engine configuration matches the hot spots in the video. On radar, their answer is that controllers looked for a low object about 35 miles away, when the plane was already high and about 65 miles away, and that the plane does appear in the radar data CEFAA itself supplied; the gap between the crew's estimated distance and the plane's is the weak point of this reading. CEFAA did not update its conclusion, but this conventional explanation was never technically refuted.

The file brings together nine continuous minutes of military FLIR video from a naval helicopter; a formal multi-agency investigation (CEFAA, DGAC, Air Force, Navy, meteorology, academia) sustained for more than two years; the full public release of the material and report by a government agency; and an official classification of 'anomalous aerial phenomenon' unidentified. Chile showed that a state can investigate and then release the material without classifying it in perpetuity.

But transparency is not evidence. Two structural weaknesses keep the prosaic reading alive. The first is that the distance, on which everything else depends, was only estimated by eye: at 35 miles the object would look like a slow, low aircraft; at 65 miles and high altitude, a climbing airliner. It is the same gap that allowed the famous 2004 Mexican Air Force FLIR case to be resolved as gas burners at the Cantarell field. The second is that the heading and time match the departure of a commercial flight from Santiago. The later independent analysis, which identified a four-engine Iberia aircraft (IB6830) with aerodynamic contrails as a candidate consistent with the geometry, was never technically refuted by CEFAA. This does not prove the explanation correct (there is no airline-record confirmation in the official report) but it does illustrate the limit of single-sensor detection: a long-range FLIR, without correlated radar or a second perspective, cannot confidently distinguish an anomalous object from a distant aircraft with a deceptive thermal signature.