A video grab shows an aerial view of the site of the crashed Turkish Airlines passenger plane at Amsterdam's Schiphol airport February 25, 2009. [Police Handout/CCTV/REUTERS]

An investigation team says the visibility was good while the plane was trying to land.

But it appeared the plane lost speed before crashing.

The plane's flight data recorders have been found and will be analyzed by experts.

Meanwhile, Boeing has sent a team of technicians to provide technical assistance to Dutch safety officials.

Officials say the plane's documents have been checked and there were no problems concerning maintenance.