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AMSTERDAM, Netherlands (CNN) -- Turkish Airlines was accused a week before one of its aircraft was involved in a deadly crash near Amsterdam of "inviting disaster" by ignoring aircraft maintenance, it emerged Thursday.
Masked investigators work at the crash site Thursday.
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Nine people were killed Tuesday, and dozens more seriously injured when the Boeing 737-800 flying from Istanbul to Amsterdam crashed into a muddy field on its final approach to Schiphol Airport.
Turkish Civil Aviation Union announced on its Web site on February 18 that Turkish Airlines "is ignoring the most basic function of flight safety, which is plane maintenance services."
"The company administration does not understand the consequences of ripping people from their jobs and inviting a disaster."
The union, which represents 12,000 Turkish Airline employees, is involved in an ugly dispute with the company's management.
Turkish Airlines posted a statement on its Web site on Thursday saying it takes safety seriously and that it followed all "maintenance procedures of the plane manufacturer, national and international authorities directives" for the plane.
Two days before the crash, the company statement said, the pilot of the plane reported failure with the "Master Caution Light" while taxiing. The part was replaced, and "after this replacement, the plane had eight take-offs and landings and there were no problems," Turkish Airlines said.
In the wake of the disaster, Turkish Airlines executives and officials from Turkey's Transportation Ministry said the Boeing 737-800 had last been inspected December 22.
"There was no problem with maintenance in the records of the plane," Candan Karlicetin, executive board chairman of Turkish Airlines, said in a news conference just hours after the crash.
Further details of those on board the crash plane were emerging Thursday.
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Theo Weterings, mayor of the nearby town of Haarlemmermeer, told a news conference that of 121 survivors examined by medics, 63 were still being treated, of whom six were in a critical condition.
Authorities know the nationalities of all but 15 of the passengers and crew, Weterings said.
Those on board the flight included 53 Dutch, 51 Turkish, seven Americans, three Britons, and one each from Germany, Bulgaria, Finland, and Taiwan. Of the fatalities, Weterings said three were Turkish.
"I want to express my deepest sympathies again to the victims of TK flight 1951," Weterings said.
Teams of investigators arrived at the crash site just after daybreak and set up a large white tent. They fanned out over the debris field, where the white fuselage of the Boeing lay in three pieces.
A special Turkish Airlines flight landed in Amsterdam Thursday morning from Istanbul, carrying about 70 relatives of those on board the fatal flight. The relatives were accompanied by trauma specialists, the airline said.
Flight 1951 was carrying 134 people, including 127 passengers and seven crew members, when it crashed less than 500 yards short of the runway Wednesday.
Among the dead were the two pilots and one pilot's apprentice, officials said.
The flight data and voice recorders were recovered.
Turkish officials have also ruled out weather conditions as a possible reason for the crash. Dutch and Turkish authorities say they await the results of an international investigation into the cause.
Aviation experts say Turkish Airlines has a relatively good safety record, though in 2003, more then 70 people were killed when a Turkish Airlines domestic flight crashed in fog near the southeastern city of Diyarbakir.
Turkey's flagship carrier had been expanding its routes and fleet of aircraft in recent years.
Hollywood actor Kevin Costner was recently hired to star in an advertising campaign for the company. Costner's commercials were to be broadcast in 70 countries.
An employee in Turkish Airlines' advertising department said the promotional campaign was suspended in the wake of the fatal plane crash.