The head of Spanair's maintenance and two technicians responsible for verifying the plane's condition before takeoff have been summoned to appear at court hearing to take place on November 3rd.
The three risk being charged with involuntary manslaughter. The crash claimed the lives of 154 people.
A report made public last week confirmed that the plane's wing flaps didn't tilt open properly prior to take off, and that no alarms sounded to warn pilots of the problem.
The aircraft, an MD-82 on its way to the Canary Islands, crashed shortly after take-off from the Madrid airport.
Only 18 of the 172 passengers and crew on board survived Spain's worst plane accident in 25 years.
One Swedish woman died in the crash, while the other woman from Sweden was among the survivors.
SAS also estimates the accident will cost the firm 500 million kronor ($67.1 million).