Aviation safety investigations & reports

Turbulence event - Canberra Aerodrome ACT, 31 January 2010, VH-ERP, Grumman Traveller AA-5

Investigation number:
Status: Completed
Investigation completed


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On 31 January 2010, an American Aircraft Corporation Grumman Traveller AA-5 aircraft, registered VH-ERP, was being operated on a visual flight rules private flight from Temora, New South Wales to Canberra, Australian Capital Territory. At about 1630 Eastern Daylight-saving Time, on late final approach to runway 12 at Canberra Aerodrome, and at an altitude of about 150 ft above ground level, the aircraft experienced severe turbulence that resulted in a brief loss of control. The pilot recovered control and landed on runway 12.

The investigation determined that it was probable that the severe turbulence was generated by a combination of the wind conditions on the day and the position of the two buildings located about 220 m and 290 m upwind from runway 12. In addition, there were no standard criteria for assessing the potential local wind effect of aerodrome building developments on aviation operations, and no national building codes for aerodrome developments that address the phenomena of building-induced turbulence.

The aerodrome operator had commissioned pre-construction wind impact assessments of the two buildings to the north of runway 12. These reports concluded that the buildings would not result in adverse wind effects on aircraft operations. This conclusion was based in part on the assessment that use of runway 12 was unlikely in northerly wind conditions. However, operations to that runway remained possible in those conditions without any alert to affected pilots about possible risk. By contrast the Canberra Aerodrome information in the En Route Supplement Australia alerted pilots of the possibility of severe turbulence during touchdown on runway 35 in strong westerly winds.

Subsequent to this occurrence, the Department of Infrastructure, Transport, Regional Development and Local Government established the National Airports Safety Advisory Group (NASAG). NASAG's role is to examine airport planning issues, including the potential local wind effects of buildings on aircraft operations, and to develop a set of universal guidelines and policy material for application at state and local levels. In addition, Airservices Australia is progressing the installation of wind shear detection technologies at several aerodromes. There is the potential that one of those installations could be at Canberra Aerodrome.

Download Final Report
[Download  PDF: 3.67MB]
Alternate: [Download  DOC: 1.63MB]
General details
Date: 31 January 2010   Investigation status: Completed  
Time: 1630 ESuT    
Location   (show map): Canberra Aerodrome   Investigation type: Occurrence Investigation  
State: Australian Capital Territory   Occurrence type: Turbulence/windshear/microburst  
Release date: 05 April 2011   Occurrence class: Environment  
Report status: Final   Occurrence category: Incident  
  Highest injury level: None  

Aircraft details

Aircraft details
Aircraft manufacturer American Aircraft Corp  
Aircraft model AA-5  
Aircraft registration VH-ERP  
Serial number AA5-0691  
Type of operation Private  
Damage to aircraft Nil  
Departure point Temora, NSW  
Destination Canberra, ACT  
Last update 14 November 2018