http://www.wusa9.com/story/news/2014/12/09/plane-crash-gaithersburg-md-investigation/20131661/
Excerpts from the center of that news story:
(NTSB spokesman Robert) Sumwalt discussed the NTSB's finding from the plane's cockpit voice recorder and flight data recorder. The cockpit voice recorder contained 57 minutes of good quality audio, according to the NTSB.
About 20 seconds before the end of the recording, there was an automated stall-warning call out which continued until the end. A stall warning announces an impeding aerodynamic stall which happens when airflow over top of the wings gets disrupted, Sumwalt said.
The lowest recorded airspeed was approximately 88 knots (101 mph), as determined using the flight data recorder. At that point there were "large excursions in pitch and in roll," according to preliminary findings by the NTSB.
A structure group spent Tuesday morning diagramming the wreckage and located all four corners of the plane. That includes the nose, tail and both wing tips, and verifies that the plane was intact prior to impact.
An operations group is gathering information about the pilot, identified as Michael Rosenberg. He had 4500 flying hours and had been involved in a prior accident in March 2010, according to the Sumwalt.
There were three instructor pilots in area at the time of the crash, one in the traffic pattern of the plane and two on the ground. Two pilots reported seeing the plane, and both reported seeing pitch and roll, according to the NTSB's findings.