MCAS exists in a different form on the Boeing KC-46 Pegasus , an aerial refueling tanker that is fundamentally a Boeing 767-2C . The system takes input on dual redundant angle of attack sensors ; it will disengage with stick input by the pilot . The Air Force stated that " The KC-46 has protections that ensure pilot manual inputs have override priority " and that it " does not fly the models of aircraft involved in the recent accidents " and that it is " reviewing our procedures and training as part of our normal and ongoing review process . " The MCAS has been under scrutiny following the fatal crashes of Lion Air Flight 610 and Ethiopian Airlines Flight 302 soon after takeoff . The global fleet has been grounded by all airlines and operators , and a number of functional issues have been raised
Ethiopian Airlines Flight 302
Ethiopian Airlines Flight 302
Maneuvering Characteristics Augmentation System