"That will absolutely be part of this investigation of looking at when exactly did the pilot become unresponsive and why did the airplane fly the flight track that it did fly?
We don't know the information yet," NTSB investigator Adam Gerhardt told reporters near the crash site.
The plane was carrying four including the pilot, a source told Reuters Sunday when it crashed near the George Washington National Forest.
Encore owner John Rumpel told the Washington Post his daughter, a grandchild and her nanny were on board.
The U.S. military attempted to contact the pilot, who was unresponsive, North American Aerospace Defense Command (NORAD) said in a statement.
Persons:
Adam Gerhardt, Gerhardt, John Rumpel, Rumpel, David Shepardson, Lisa Shumaker
Organizations:
Washington , D.C, National Transportation Safety Board, Pentagon, Cessna, NTSB, U.S, Reuters, George Washington National, Virginia State Police, Encore Motors, Washington Post, FAA, North American Aerospace Defense Command, NORAD, Elizabethton Municipal, MacArthur, Thomson
Locations:
Washington ,, Virginia, Delaware, Melbourne , Florida, U.S, Elizabethton , Tennessee, New York, Manhattan