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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.

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General details
Date: 04 June 2010 Investigation status: Completed 
Time: 1345 EST  
Location   (show map):4 km south of Dayboro Investigation type: Occurrence Investigation 
State: Queensland Occurrence type: Near collision 
Release date: 14 October 2010 Occurrence class: Airspace 
Report status: Final Occurrence category: Serious Incident 
 Highest injury level: None 
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 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
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Last update 18 April 2018