Event Summary
The pilot reported that during the approach phase of the flight, at approximately 500 feet above ground level and an indicated airspeed of 81 knots, he perceived a significant increase in the airplane's descent rate. In response, he increased engine power, but the high rate of descent persisted. He subsequently increased engine power further.
Loss of Control
A slow left roll developed following the increased power application. The pilot applied full right aileron and full right rudder to arrest the roll. Additionally, he reduced engine power, at which point the left roll ceased. The pilot was able to regain control of the airplane; however, the airplane's heading was 45 degrees left of the runway heading.
Collision and Damage
The airplane collided with mesquite trees and subsequently impacted the terrain. The impact caused a fire, and the pilot and passenger exited the airplane through the emergency exit. The airplane sustained substantial damage to the windscreens and fuselage.
Mechanical Condition
The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.