The voice cockpit of Continental Connection Flight 3407, the plane that crashed into a house in Buffalo and killed 50 people, was analyzed by investigators in Washington and Buffalo. According to data released by a National Transportation Safety Board member, the plane fell from 1,800 feet above sea level to 1,000 feet in five seconds.

The aircraft crashed with its belly first into a house situated about six miles from the Buffalo Niagara International Airport - where the plane was supposed to touch down. The plane’s voice cockpit revealed the discussion between the aircraft’s pilots who were concerned about the "significant" ice buildup on the wings and windshield.

NTSB member Steve Chealander said the pilot of Flight 3407 might have neglected federal safety recommendations and left the plane’s autopilot on even after notifying air traffic control that the flight crew had spotted ice on the leading edge of the wings and the windshield.

The plane featured a "stick shaker" and "stick pusher" mechanism that warns the pilot if the aircrafts risks losing aerodynamic lift. It the pilot doesn’t correct it in time, the mechanism pushes the stick forward to avert a stall, the situation when a plane loses aerodynamic lift.

Chealander said the plane was put on autopilot, the mechanism kicked in putting the plane in the pilot’s hands and, at some point, the pilot switched on an anti-stall device that increases the speed of the plane by 20 knots.

"Everything that should have been done was done, so we keep looking," said Chealander.

"We keep looking, trying to find out why this happened."

Investigators said both engines seemed to be working properly before the plane crashed.