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9 fatalities

Fatal aircraft collision with mountainside during cruise (PP-FOR)

Bias Fortes, BrazilFlight

On October 22, 1974, a Douglas C-47 Skytrain (DC-3) (registration PP-FOR) operated by Projeto Rondon was involved in an aviation accident near Bias Fortes, Brazil in flight. 9 people were killed. Investigators recorded the probable cause as: The aircraft struck terrain while operating in low-visibility foggy conditions during the cruise phase. This summary draws on records from the Bureau of Aircraft Accidents Archives (B3A).

Sourcesthe Bureau of Aircraft Accidents Archives (B3A)Primary reportUpdated 2026-06-12Data APIEditorial standards

An aircraft crashed into a mountain slope while flying through heavy fog, resulting in no survivors.

What happened

During the cruise phase of flight, an aircraft encountered dense fog while traveling through mountainous terrain. While navigating these low-visibility conditions, the plane collided with the side of a mountain. The impact caused the aircraft to crash, leaving no possibility of survival for those on board.

Findings

  • The accident occurred during the cruise portion of the flight.
  • Environmental conditions were characterized by significant fog.
  • The collision involved the aircraft striking a mountain slope.
  • There were nine fatalities recorded as a result of the impact.

Probable cause

The aircraft struck terrain while operating in low-visibility foggy conditions during the cruise phase.

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