Pilot Report
The pilot reported that during takeoff, after reaching an altitude of approximately 100 feet above ground level (AGL), he reduced power and began retracting the flaps from the takeoff setting. At that moment, he felt the aircraft 'give.' He immediately re-extended the flaps, applied full throttle, and dumped his load, but the aircraft continued to lose altitude and airspeed until it struck the top of a tree and crashed.
Post-Crash Examination
An examination of the wreckage revealed that the top member of the right wing tubular rear spar was broken at the cluster joint where the spar attaches to the fuselage stub wing. The fracture surfaces were severely rusted. The fracture occurred where the wing had been welded.
History
Reportedly, the right wing tip had been damaged approximately three years prior to the accident and was subsequently repaired.