An ATSB report has found that a recent airspace incident was both an 'airprox' and a 'serious incident' and that a Brasilia and a Partenavia aircraft passed about 40 m horizontally at the same altitude from each other.
The flight crew of the instrument flight rules (IFR) Brasilia was on descent through 9,500 ft from Darwin to Kununurra Airport on airway J72 in visual meteorological conditions (VMC). The flight was a scheduled Regular Public Transport (RPT) service. The pilot of a visual flight rules (VFR) Partenavia was tracking in the opposite direction from overhead Kununurra to Darwin at 9…