Turkish Airlines Flight 1951 crashed during landing at the Amsterdam Schiphol Airport, Netherlands, primarily due to a faulty radio altimeter, resulting in the death of nine passengers and crew including all three pilots.

Turkish Airlines Flight 1951 was a passenger flight that crashed during landing at Amsterdam Schiphol Airport, the Netherlands, on 25 February 2009, resulting in the deaths of nine passengers and crew, including all three pilots.

Amsterdam Airport Schiphol, known informally as Schiphol Airport, is the main international airport of the Netherlands, and is one of the major hubs for the SkyTeam airline alliance. It is located 9 kilometres southwest of Amsterdam, in the municipality of Haarlemmermeer in the province of North Holland. It was the world's third busiest airport by international passenger traffic in 2023. With almost 72 million passengers in 2019, it is the third-busiest airport in Europe in terms of passenger volume and the busiest in Europe in terms of aircraft movements. With an annual cargo tonnage of 1.74 million, it is the 4th busiest in Europe. AMS covers a total area of 6,887 acres of land. The airport is built on the single-terminal concept: one large terminal split into three departure halls.

A radar altimeter (RA), also called a radio altimeter (RALT), electronic altimeter, reflection altimeter, or low-range radio altimeter (LRRA), measures altitude above the terrain presently beneath an aircraft or spacecraft by timing how long it takes a beam of radio waves to travel to ground, reflect, and return to the craft. This type of altimeter provides the distance between the antenna and the ground directly below it, in contrast to a barometric altimeter which provides the distance above a defined vertical datum, usually mean sea level.

February 25 is the 56th day of the year in the Gregorian calendar; 309 days remain until the end of the year.