a central question of the probe there s been no comment so far from the plane maker boeing it s continued to insist the mac series is safe the wall street journal reports the m cas software aboard ethiopian airlines flight three hundred two bound for nairobi activated automatically before the plane nose dived into the ground while one hundred fifty seven people on board died. the family of one passenger from rwanda has filed a lawsuit in chicago federal court alleging boeing defectively designed the automated flight control system the m. cas flight control feature has also been implicated in a fatal crash by a lion air flight in indonesia last year many analysts suspect that in both cases the software repeatedly pushed the nose of the plane down despite the pilots attempts to correct the move. the world s largest tourism company is under pressure following the grounding of all those boeing seven three seven x.