At 14:40 PDT, a Cessna Cardinal crashed in a box canyon approximately 10 miles southeast of the Boulder City airport. The flight instructor was seriously injured and the pilot was killed. The pilot and his son had just purchased the airplane. The son had taken a familiarization flight with the CFI earlier in the day that included a 360-degree turn in the same box canyon and noted no discrepancies with the airplane. The crew of a police helicopter that responded to the scene reported swirling winds in the box canyon during their approach. The helicopter was flown in what they believed was a similar pattern to the accident airplane and the helicopter completed the turn over the wreckage.