At approximately 1430 Pacific time, a Grumman American AA-1 crashed into a pond about a quarter-mile short of runway 33 at Chehalis-Centralia Airport. The pilot was seriously injured and his passenger received minor injuries. The pilot and his passenger took off hoping to look at some land in the local area, but soon after becoming airborne found that the subject area was covered by dense low-level fog. They returned to the airport and, because of fog to the north and west of the field, made a straight-in VFR approach to runway 33. During the last part of the approach, the pilot reduced the power to near idle and, when he advanced the throttle, there was no response from the engine. As the pilot attempted to stretch the glide to the runway, the aircraft slowed and dropped into the pond.