Findings From the evidence available, the following findings are made with respect to the loss of control and collision with terrain involving the SOCATA TB 20, registered VH-HBB, which occurred 3 km south of Lismore Airport, New South Wales on 9 November 2012. These findings should not be read as apportioning blame or liability to any particular organisation or individual. Contributing factors During a left turn in the circuit, an aerodynamic stall occurred, resulting in a significant left winglow and nose-down attitude in close proximity to the terrain. The instructor was unable to prevent the stall due to either insufficient warning or available time to react. The aircraft stalled at an altitude from which recovery to controlled flight was not completed before the aircraft collided with terrain. Other factors that increased risk Half of the crankcase through bolts fitted to the engine were probably not approved parts for use in that engine, meaning that the continued safe operation of the engine was not assured.
Findings From the evidence available, the following findings are made with respect to the loss of control and collision with terrain involving the SOCATA TB 20, registered VH-HBB, which occurred 3 km south of Lismore Airport, New South Wales on 9 November 2012. These findings should not be read as apportioning blame or liability to any particular organisation or individual. Contributing factors During a left turn in the circuit, an aerodynamic stall occurred, resulting in a significant left winglow and nose-down attitude in close proximity to the terrain. The instructor was unable to prevent the stall due to either insufficient warning or available time to react. The aircraft stalled at an altitude from which recovery to controlled flight was not completed before the aircraft collided with terrain. Other factors that increased risk Half of the crankcase through bolts fitted to the engine were probably not approved parts for use in that engine, meaning that the continued safe operation of the engine was not assured.
ao-2012-149_final.docx