On November 21, 1977, Austral Líneas Aéreas Flight 9 crashed near Bariloche, Argentina, killing 46 of the 79 people on board.

At 00:40, the flight was cleared for an Instrument Landing System (ILS) approach to runway 28, but abandoned the approach due to a VOR receiver problem.

The pilot then reported that the aircraft was near the VOR beacon.

The aircraft then crashed into a mountain killing all five crew members and 41 passengers.

[4] Investigators determined that the flight crew descended prematurely and did not follow allowed the ILS procedure, possible due to the VOR signal malfunctions, and the captain's mental state.