kate to chirs:"to his last day in court steve never gave up the idea dad made him do it. if they are going to open the case again I won't live through it." what did keller make steve do?what case is kate talking about?

Keller told Steve to weld the cracks in the airplane parts and ship them out. Steve was nervous about doing this alone, but Keller said that he had the flu and could not go into work. Steve shipped out the defective but possibly safe parts on his own. 21 planes went down because of the faulty parts.