A senior Boeing engineer filed an internal ethics complaint this year saying that during the development of the 737 Max jet the company had rejected a safety system to minimize costs, equipment that he felt could have reduced risks that contributed to two fatal crashes.

Boeing has provided the complaint, which was reviewed by The New York Times, to the Department of Justice as part of a criminal investigation into the design of the Max, according to a person with knowledge of the inquiry, who requested anonymity given the active legal matter. Federal investigators have questioned at least one former Boeing employee about the allegations, said another person with knowledge of the discussions, who similarly requested anonymity.

It is unclear what, if any, assessment investigators have made of the complaint.

The complaint, filed after the two crashes, builds on concerns about Boeing’s corporate culture, as the company tries to repair its reputation and get the planes flying again.

Many current and former Boeing employees have privately discussed problems with the design and decision-making process on the 737 Max, outlining episodes when managers dismissed engineers’ recommendations or put a priority on profits. The engineer who filed the ethics concerns this year, Curtis Ewbank, went a step further, lodging a formal complaint and calling out the chief executive for publicly misrepresenting the safety of the plane.