FAB and the Inquérito Policial Militar files — how Brazil archives its UAP record

When Brazilian UAP researchers refer to "the FAB IPM files," they are pointing to a specific institutional artefact: the Air Force's internal investigative-file system, into which decades of UAP-related material has been catalogued and from which batches have been progressively released to the Brazilian National Archives since the late 2000s. Understanding this filing structure is the key to understanding why Brazil's documentary UAP record is comparatively coherent — and why some prominent cases are richly documented inside it while others, equally famous publicly, are barely represented.

What an IPM actually is

The Inquérito Policial Militar is the standing investigative-file format used by the Brazilian armed forces for internal inquiries across a wide range of subjects, not specific to UAP. An IPM is opened when a matter is judged to warrant a formal investigative record, is assigned an officer, accumulates exhibits and testimony, and is eventually closed with a final report and supporting documentation. The same format used to investigate, for example, equipment loss or operational incidents has also been used — sporadically across the decades — to document UAP-related episodes that came to the Air Force's attention through pilot reports, civilian referrals, or its own field operations.

The Operação Prato dossier of 1977–78 is the best-known UAP IPM in Brazilian history and remains the most extensively studied. But it is not alone. Researchers have identified IPMs and related institutional files tied to a range of episodes from the 1950s onward, including pilot-report sequences from the 1980s, the "Official UFO Night of Brazil" cluster of 19 May 1986 in which multiple FAB aircraft were scrambled, and various regional command files covering events that never reached comparable international visibility.

How the release process works

Beginning in the late 2000s, and accelerating after the establishment of Brazil's Lei de Acesso à Informação (Access to Information Law) in 2011, the FAB began transferring batches of historical UAP-related IPM material to the Arquivo Nacional. The release is incremental rather than en masse: documents are reviewed, redacted where required, and cleared in defined tranches. Researchers can consult declassified material through the National Archives in Brasília and, in many cases, through digital indexes maintained by the archive and by Brazilian UAP-research organisations.

Two structural features of this release process matter. First, it is a permanent administrative pipeline, not a one-off political gesture, which means new material continues to surface as additional batches are processed. Second, the released material reflects the underlying IPM structure — typed reports, witness statements, exhibits — rather than being repackaged into a press-friendly summary. For researchers this is a feature; for casual readers it can make the material feel inaccessible without a guide. SkyLens case-by-case coverage aims to bridge that gap for the most-requested files.

What is and is not in the record

The IPM system represents the cases the Air Force itself chose to formally investigate. That selection bias is important to name. Episodes that the FAB did not open an IPM into — most prominently the Varginha events of January 1996 — have correspondingly thin institutional documentary trails, regardless of how dense the civilian witness record is. Conversely, episodes the FAB did formally document but that received limited international press coverage — including regional pilot-report sequences from the 1980s — are sometimes better archived than their public profile would suggest.

This asymmetry is one of the most important things to internalise when working with the Brazilian record. The map of "what is in the IPM archive" is not the same as the map of "what is famous." The archive is shaped by what the institution chose to formalise; fame is shaped by which cases reached the press and the international UAP-research circuit.

How this connects to current reporting

The contemporary equivalent of the historical IPM stream is the standing pilot-reporting framework operated under Ordinance 551/GC3. That ordinance produces a continuing flow of professionally filed reports, which over time will themselves enter the same archival pipeline that has surfaced the 1970s and 1980s material in recent years. Brazil's UAP archive is therefore best understood not as a closed historical artefact but as a working, accreting institutional record, of which the publicly visible cases — Trindade 1958, Operação Prato 1977–78, the 2025 pilot-report release — are the most legible surface points. For the full case index, including links between the historical and contemporary tiers of the record, see the SkyLens UAP files page.

Editorial note: This is independent SkyLens reporting on a publicly documented case from the Brazilian UAP record. Related cases and primary-source releases are catalogued on the SkyLens UAP files page.