Adam Air was sued by Indonesian consumer and labour groups over the accident , for a total of one trillion rupiahs ( US$ 100 million ) , to be paid to the families of the victims . According to a lawyer for the families , speaking in a press conference along with the secretary for the Adam Air KI-574 Passengers ' Families Association ( formed in the aftermath of the disaster ) , 30 of the victims ' families intend to sue Boeing instead of Adam Air over the accident . However , this does not necessarily mean that all of the others will sue Adam Air , as they may not necessarily exercise their right to sue at all . Representatives of the families have explained that they believe the plane was brought down by a faulty rudder control valve , similar to the accidents involving United Airlines Flight 585 and USAir Flight 427 , which went down in the early 1990s , although there is no evidence that proves this . They have explained that , as a result , they are suing Boeing and Parker Hannifin , the valve 's manufacturer , although airlines using the 737-300 , -400 , and -500 have been warned about problems with the rudder control valves
United Airlines Flight 585
United Airlines Flight 585
Adam Air Flight 574