Separation issue involving a Cessna 402C, VH-UBF and Aero Commander 500-S, VH-TFW, 4 km west of Groote Eylandt Aerodrome, Northern Territory, on 1 August 1997

An aircraft was approaching to land through a straight-in approach in accordance with the published procedures and criteria. At about 2 NM on final approach, another aircraft reported on base. Although an attempt to contact the aircraft on base by radio was made, it continued and joined final about 500 m in front of the aircraft conducting the straight-in approach. The pilot flying the straight-in approach conducted a go-around and landed off a normal circuit.