Aviation safety investigations & reports

Aircraft proximity event - VH-­YHM and VH-­RQZ, 4 km south of Dayboro, 4 June 2010

Investigation number:
Status: Completed
Investigation completed


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On 4 June 2010, at about 1345 Eastern Standard Time, a Diamond Aircraft Industries DA40-D (DA40), registered VH-YHM, was travelling in a westerly direction towards Esk, Queensland (Qld), maintaining 2,500 ft. When passing Dayboro, Qld, the DA40 came into close proximity with a Cessna Aircraft Company 172R (C172), registered VH-RQZ, which was descending through 2,500 ft, heading to the south.

The lateral separation between the aircraft was estimated at 10 m, with the DA40 in front of, and slightly below the C172. While the pilots of both aircraft had sighted each other, there was insufficient time to respond and take any action.

The pilots both reported maintaining a visual lookout, but having been temporarily distracted just prior to the incident.

Flights conducted outside controlled airspace (Class G) are not provided with a traffic separation service from air traffic control (ATC). Consequently, maintaining separation is the pilot's responsibility. It is crucial that pilots employ a number of defences to ensure that separation between aircraft is suitably achieved. Applying unalerted and alerted see-and-avoid principles by maintaining a vigilant lookout, and providing and interpreting radio communications will assist in enhancing situational awareness.

Download Final Report
[Download  PDF: 2.47MB]
General details
Date: 04 June 2010   Investigation status: Completed  
Time: 1345 EST   Investigation level: Short - click for an explanation of investigation levels  
Location   (show map): 4 km south of Dayboro    
State: Queensland   Occurrence type: Near collision  
Release date: 14 October 2010   Occurrence category: Serious Incident  
Report status: Final   Highest injury level: None  

Aircraft 1 details

Aircraft 1 details
Aircraft manufacturer Diamond Aircraft Industries  
Aircraft model DA40  
Aircraft registration VH-YHM  
Serial number D4.308  
Type of operation Flying Training  
Damage to aircraft Nil  
Departure point Gold Coast, Qld  
Destination Gold Coast, Qld  

Aircraft 2 details

Aircraft 2 details
Aircraft manufacturer Cessna Aircraft Company  
Aircraft model 172  
Aircraft registration VH-RQZ  
Serial number 17280980  
Type of operation Flying Training  
Damage to aircraft Nil  
Departure point Wondai, Qld  
Destination Archerfield, Qld  
Last update 14 November 2018