In a telephone interview with The Associated Press, Njoroge went further, saying Boeing should scrap the plane and company executives should resign and face criminal charges. If Boeing and the FAA had done their jobs properly, he said, "these planes would have been grounded in November and today I would be enjoying summer with my family, I would be playing football with my son." Because the size and placement of the plane's engines raised the risk of an aerodynamic stall, Boeing devised flight-control software called MCAS. Preliminary reports indicate that the software pushed the nose of the plane down in both crashes, and Boeing is working on changes to make MCAS more reliable and easier to control. Boeing did not tell pilots about MCAS until after the Oct. 29 crash of a Lion Air Max. Njoroge believes the company hid the existence of the software to cover up what he considers an irredeemable flaw that MCAS was designed to offset — the plane's tendency to pitch nose-up in some conditions.