Nine people were killed when flight TK 1951 from Istanbul crashed on approach to Schiphol Airport on Feb. 25, 2009.

Investigators had earlier said a faulty altimeter had shut down the engine of the Boeing 737-800 before it crashed.

But the Dutch Safety Board said in its final report that a combination of the altimeter problems, bad reactions from the pilots to a loss of speed and insufficient directions from air traffic control led to the crash.

The board said that due to the failing of the altimeter, the airliner automatically lost speed, dropping below the minimum speed it must maintain to avoid the risk of engines stalling, and "this resulted in a situation in which the wings could not provide enough lift and the plane crashed." Safety board director Pieter van Vollenhoven added at a news conference that via "an exceptionally unfortunate combination of circumstances" the crew received directions from air traffic control to approach the runway in the usual manner.

Boeing had said in response to the initial findings last year that it was "issuing a reminder to all 737 operators to carefully monitor primary flight instruments during critical phases of flight.”

Dutch law office AKD Prinsen Van Wijmen (AKD) has since said that survivors of the crash have agreed to its advice to ask Clifford Law Offices to start compensation proceedings in the United States against Boeing.