The historic fighter aircraft was being flown from Wanaka to Auckland to take part in an Air Display. A brief landing was planned at Woodbourne to refuel. The pilot made a standard approach to grass runway 07 with allowance for the light crosswind. Shortly after a normal touchdown, an unexpected gust caused a swing to the right. Braking action was uneffective on the wet grass and the pilot applied power for a go-around, but the aircraft slid sideways and the left undercarriage collapsed at the edge of the asphalt taxiway which crossed the grass runway at right angles.