Two CA25 aircraft, VH-ZVC and VH-DLY, were operating in the circuit using runway 18. The pilots, both solo students, had been communicating with each other on the mandatory broadcast zone (MBZ) frequency. The pilot of ZVC had just turned final when DLY was turning base. The pilot of ZVC had reported base for a full stop landing. The pilot of DLY also reported base for a full stop landing. At no time did either pilot hear any other aircraft transmissions. As ZVC touched down the pilot became aware of a large twin engined aircraft approaching head on at high speed after it had landed on runway 36. The pilot of ZVC applied full power and went around passing over the top of the twin. The pilot of DLY was unaware of the presence of the twin and landed just as it was exiting the runway. As the twin engined aircraft VH-OCF taxied onto the apron the pilot apologised to the other pilots on the MBZ frequency.
The pilot of OCF said that he was flying on a scheduled service from Brisbane to Maroochydore. Whilst enroute he noticed the wind was from the north-east and planned his approach to land on runway 36. The pilot stated that during the descent he made a number of transmissions approaching the MBZ but heard no response. The Maroochydore MBZ has the same lateral dimensions as the control zone. He did not consider it unusual that there was no response, as frequently there is no other traffic, and if there is, he is usually advised by Brisbane Centre. After having cancelled SAR with Brisbane Centre, and when lined up on short final for runway 36, the pilot detected movement at the far end of the runway. He said a small dark object had risen from the ground which he initially thought was a bird, but he then realised it was a small aircraft. He then noticed another aircraft on final approach for runway 18 as he vacated runway 36. He then noticed that his VHF was selected to 124.8 mhz instead of the MBZ frequency 124.4 mhz.
