The main recovery effort to raise the wreckage is expected to begin on Sept. 26.
The U.S. Navy will use the Deep Drone 8000 remotely operated vehicle (ROV), a barge and a crane to recover the wreckage from the seafloor. Once the barge is outfitted and in place, it will be a 24/7 operation. The crane will lift the aircraft wreckage pieces. The ROV will work on the seafloor collecting smaller pieces of wreckage into baskets and connecting the wreckage to the crane to be lifted.
NTSB also released a preliminary report for the investigation. The report contains facts only; the NTSB will determine the probable cause of the crash at the end of the investigation.
According to the preliminary report, the aircraft departed from Friday Harbor, Washington, around 2:50 p.m. Pacific time, with a destination of Renton Municipal Airport. At 3:09 p.m., the aircraft impacted the water and sank. The pilot and nine passengers were fatally injured.
The airplane was operating as a business charter flight. The accident occurred during the pilot’s second trip of the day. Each trip involved multiple flight legs.
Witnesses near the accident site reported the airplane was in level flight before it entered a slight climb, then pitched down in a near-vertical descent. Several witnesses described the airplane “spinning,” “rotating” or “spiraling” during portions of the descent.
NTSB coordinated with the Washington Department of Fish and Wildlife, National Oceanic and Atmospheric Administration’s Navigation Response Team and the University of Washington’s Applied Physics Laboratory to locate the wreckage in Mutiny Bay. A sonar survey located the main wreckage and debris field at a depth of approximately 190 feet.
