The aircraft departed Carnarvon at 1658 WST with an estimated
time interval of 67 minutes to Wanna Station and a total endurance
of 220 minutes. Last light at Carnarvon was 1807 WST and the pilot
based his flight plan on that time which gave a margin of two
minutes from estimated time of arrival to last light. Last light at
Wanna, which is some 168 miles east north east of Carnarvon was in
fact 1801 WST, four minutes before the estimated arrival time.
Actual arrival over Wanna was made at 1807 WST and after twice
overflying the area, the pilot made an approach to the airstrip,
which was without lighting. The aircraft landing lights were used,
but the pilot overshot the threshold of the strip and touch down
was not effected until within 730 feet of the far end of the 3,500
feet long landing area. The pilot was unable to stop the aircraft
in the available length remaining and, when the end of the strip
was reached, the aircraft collided with a tree.