WASHINGTON – According to The Wallstreet Journal, the NTSB suspect that pilot error led tot the deadly crash of Amazon Prime Air Flight 3591 killing all 3 men on board on February 23.

On March 5 the NTSB said that the Boeing 767-300 cargo plane entered some turbulence shortly before the plane’s crash into Trinity Bay. The engines increased to maximum thrust, after which the airplane pitch turned slightly up. That “startled the cockpit crew,” The Wall Street Journal reported, citing several sources familiar with the details.

The crew then tried to push the nose of the plane down. This caused an unusually steep descent at a 49 degree angle, The Wall Street Journal reported.

According to the NTSB the plane accelerated to 495 mph as it dropped. The crew then pulled the plane up to a 20 degree angle. Ultimately, in the last 18 seconds of the plane’s descent, the crew lost control of the plane, the NTSB said.

The NTSB is still investigating why the plane underwent a sharp change in pitch.