Aviation safety investigations & reports

Aircraft proximity event - Cessna 182P, VH-MST and Schempp-Hirth, VH-ULZ, 9 km west of Toowoomba Airport, Qld, 25 September 2011

Investigation number:
Status: Completed
Investigation completed


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On 25 September 2011, the pilot of a Cessna Aircraft Company 182, registered VH-MST (MST) was inbound to Toowoomba, Queensland (Qld) from Roma, Qld.  At the same time, a Schempp-Hirth Ventus 2c glider, registered VH-ULZ (ULZ) was competing in the Qld State Soaring championships and thermalling west of Toowoomba on track for Jimbour.

Whilst on descent through 4,000 ft the pilot of MST sighted a glider between 300 m and 500 m in front and at the same level.  The glider was heading directly for MST and the pilot was required to take evasive action. 

The distance between the two aircraft was estimated at 100m horizontally.

The incident highlights the need for pilots to apply the principles of 'see-and-avoid' in combination with an active listening watch on the appropriate radio frequency. Furthermore, simply having a radio is no guarantee of safety. It is imperative that pilots broadcast their position and intentions, for the performance of the more effective 'alerted see-and-avoid'.

Download Final report
[Download  PDF: 4.43MB]
General details
Date: 25 September 2011   Investigation status: Completed  
Time: 1400 EST   Investigation level: Short - click for an explanation of investigation levels  
Location   (show map): 9 km west of Toowoomba Airport    
State: Queensland   Occurrence type: Near collision  
Release date: 14 March 2012   Occurrence category: Serious Incident  
Report status: Final   Highest injury level: None  

Aircraft 1 details

Aircraft 1 details
Aircraft manufacturer Cessna Aircraft Company  
Aircraft model 182  
Aircraft registration VH-MST  
Serial number 18264628  
Type of operation Private  
Damage to aircraft Nil  
Departure point Roma, QLD  
Destination Toowoomba, QLD  

Aircraft 2 details

Aircraft 2 details
Aircraft manufacturer Schempp-Hirth Flugzeugbau GmbH  
Aircraft model Ventus  
Aircraft registration VH-ULZ  
Serial number 96  
Type of operation Gliding  
Damage to aircraft Nil  
Departure point west of Toowoomba, Qld  
Destination Jimbour, Qld  
Last update 14 November 2018