Background
A pilot and a traffic reporter were scheduled to fly an early morning traffic watch mission, planning to provide coverage in the Washington/Virginia area for about three hours. The reporter stated that they departed at approximately 6:00 a.m.
Accident Sequence
According to the traffic reporter, the airplane was at an altitude of about 400 feet when they attempted to land. The pilot added power with the flaps set to 40 degrees. The reporter indicated that the airplane then stalled, and he heard the pilot exclaim, "Oh no." A witness located about one-quarter mile from the accident site reported hearing an airplane circling overhead but could not see it due to dense fog. Shortly after, through broken clouds, the witness saw a blue and white airplane, heard an engine surge, and then heard an impact.
Damage
The airplane struck the patio of a residence. The collision and subsequent post-crash fire destroyed the airplane and the rear section of the residence.
Weather Conditions
A helicopter pilot who was also reporting traffic noted that the ceiling was about 300 feet with no forward visibility. The accident airplane's reporter described the ceiling as being around 400 feet at the time of the incident.
Examination
An examination of the engine and airframe revealed no evidence of any mechanical malfunction.