Austral Líneas Aéreas Flight 046 was an Argentine scheduled domestic flight from Buenos Aires to Posadas, via Resistencia, that undershot the runway at Libertador General José de San Martín Airport in Posadas on June 12, 1988, in conditions of poor visibility.

The weather at the time was very poor, with extremely dense fog reducing visibility to just 100 meters.

Shortly after making contact with controllers at Posados Airport, the aircraft struck the top of a eucalyptus tree, flipped on its side and crashed 3 kilometers (1.9 mi; 1.6 nmi) short of the runway.

Analysis of the recovered cockpit voice recording revealed the first officers hesitation to land in extremely dense fog, as well as his dismay when realising the aircraft had descended below the lowest safe altitude permitted for the approach.

[1] The JIAAC made recommendations to the National Transportation Safety Board and McDonnell Douglas to improve the insulation of both recorders, and to strengthen the wiring that connects the cockpit area microphone to the actual cockpit voice recorder located in the empennage.