Witnesses at the airport stated that just after the airplane lifted off runway 16R, it immediately began a very tight 360 degree turn and crashed between runway 16L and the adjacent taxiway. The pilot stated to Federal Aviation Administration (FAA) inspectors that, after liftoff, the airplane began turning to the left and trying to dive and that he had great difficulty overriding the forces on the controls. The pilot, who is also a certified flight instructor, stated that he was flying the airplane from the right front seat. FAA inspectors examined the wreckage and found the right seat rudder pedal collapsed to the floor. The FAA inspector pulled the stowable rudder pedal into the flight position, and it locked in place. When the FAA inspector applied hand pressure to both pedals, the right pedal snapped into the retract position. He attempted this several times. The FAA inspector disassembled the pedal and found that the pin receiving hole was worn oblong, allowing the pin to disengage.