On 14 March 1971, two young witnesses at El Plantío station in the Madrid area reported an object which appeared stationary before moving rapidly and disappearing among clouds. The Spanish Air Force collected short statements and a drawing, checked nearby control centres and retained the material in expediente 710314. A 1993 review proposed that the witnesses might have seen an aircraft, while stressing that their accounts lacked basic information.
The released file is particularly useful for showing how the same documentary record can contain an observation, an initial cautious interpretation and a later aircraft hypothesis. None is a demonstrated identification. The two nearly identical statements also require care: agreement in wording is not equivalent to two fully independent reconstructions of the event.
The observation at the station
The file places the incident at approximately 20:45, after dusk. The observers were looking with the naked eye from the station described as El Plantío–Majadahonda. They reported a triangular appearance and a faint engine-like noise. When asked about size, each compared it with an aircraft at the perceived height, but neither supplied a reliable numerical altitude. Their stated distance and height estimates were visual impressions.
In the brief narrative, the object initially seemed suspended in the sky. After a few seconds it moved laterally at what they described as great speed. The forms record no vertical motion or change of height. The reported observation lasted roughly one minute to a minute and a half before the object was lost among clouds. The record does not provide a timed speed measurement or establish a precisely stationary physical body.
The witnesses also described an unusual luminous feature apparently in front of the angular nose. They said this feature disappeared when the object began moving. The dossier calls it a forward trail, an awkward description which should remain attributed rather than silently corrected into an ordinary exhaust trail behind the object. Its physical cause was not established by the statements.
The drawing labels an angular, triangular form, white features and a large red light at five-second intervals. That interval is part of the supplied diagram, without an accompanying timing log. The reported triangular form and intermittent red light support the triangle and flashes appearance tags. Those labels describe the report and remain compatible with the later proposal of an ordinary aircraft.
Two forms, largely the same account
Both witnesses were interviewed using the standard information form. Its questions covered weather, viewing method, sound, shape, movement, photographs and drawings. Neither reported taking a photograph. The file includes a drawing presented with each statement, but the later review found the diagrams to be the same. The personal names and residential details are not reproduced here.
The 1993 reviewer specifically criticised the almost identical typed narratives and the lack of individual detail. The short accounts describe the same sequence in practically the same words. This limits how much independent confirmation can be extracted from their agreement. It does not establish dishonesty, and the file supplies no basis for assigning a motive to either witness.
The distinction matters because a summary saying simply that two witnesses agreed can suggest stronger corroboration than the documents warrant. Here, both observers were present together, the recorded descriptions are closely matched, and the surviving narratives do not develop different viewpoints. A careful assessment preserves the reported shared experience alongside the weaknesses of how it was documented.
Weather and the control-centre inquiries
The weather information attached to the statements describes several cloud layers, including cumulus and stratocumulus, lenticular altocumulus and cumulonimbus nearby. Horizontal visibility was reported as more than ten kilometres. The wider situation followed the passage of a cold front. This supports the presence of clouds into which an object could be lost, without identifying the object itself.
On 17 March, the inquiry contacted the control centre at Villatobas by telephone. Its response was that nothing had been observed visually or on the radar screen for the incident in question. The Paracuellos centre similarly reported nothing abnormal at the specified time. These are negative checks. They do not turn the visual account into a radar-confirmed event.
The file’s administrative correspondence shows the report being forwarded through the First Air Region and the Air Staff, with a request to meet the applicable reporting instructions. Letters in March 1971 concern obtaining and forwarding the witness information. Their presence establishes an official reporting process, rather than additional observations or a separate technical tracking exercise.
The initial investigator and the later aircraft proposal
The reporting captain’s conclusion dated 18 March 1971 concentrated on the angular front, luminous feature and its disappearance when the object moved. He said he could not make a firm conjecture, adding that the conditions and hour might have produced a luminous phenomenon. The regional command endorsed that conclusion. This was a cautious suggestion, not an experimental reproduction.
The later review offered a more specific possibility: the passage of an aircraft. It cited the engine noise, triangular appearance, comparison with an aircraft’s size, lateral motion and intermittent red light, which might have been an aircraft beacon. It also noted that several airways crossed the area. These features supplied reasons to consider an ordinary aircraft rather than assuming an exotic vehicle from the shape alone.
The review nevertheless introduced that hypothesis with explicit reservations because conclusive information was missing. It did not name a flight, identify an operator or reproduce the viewing geometry. The apparently stationary phase, forward luminous feature and observers’ speed impression were not resolved through measured data. The proposal consequently remains a possible explanation for the overall account, rather than a confirmed flight identification.
Location, release and assessment
The intelligence review was signed in September 1993 and the declassification endorsement is dated 23 September 1993. Those dates concern the later review and release of a 1971 report. They should not be used as an incident year. The review’s recommendation to release the information also does not establish that a technical solution had been reached.
Approximate map area: the pin at 40.469°N, 3.824°W represents El Plantío locality, rounded from the GeoNames locality reference. It is not a verified location of the 1971 station viewpoint, a current railway platform or the object’s position. The historical file uses El Plantío–Majadahonda; the broad pin gives context without claiming a precise modern station identification or access permission.
The outcome is Possibly Explained. The 1993 review supplies an aircraft hypothesis supported by several reported features, but the original data are sparse and the accounts are not fully independent in their surviving wording. No aircraft was conclusively identified. Keeping the documentary limitations visible is more informative than presenting either a solved aircraft case or a high-evidence unexplained object.
Source trail: Biblioteca Virtual de Defensa, expediente 710314, thirteen physical PDF pages: later review pages 2–3; correspondence pages 5–7; statements, weather checks and conclusions pages 8–9 and 11–12; repeated drawings pages 10 and 13. The government review image is reused under the catalogue’s CC BY 4.0 licence. Related reading: UFO / UAP / USO. Sources checked 13 November 2026.