"In all three flights, the pilot responses differed and did not match the assumptions of pilot responses to unintended MCAS operation on which Boeing based its hazard classifications within the safety assessment and that the FAA approved and used to ensure the design safely accommodates failures," the NTSB said.Īt least part of the reason for those mis-cues is that the underlying failure - faulty sensors that measure the angle of a plane's nose relative to the oncoming air - triggered multiple loud alarms that were potentially confusing, the NTSB found. A third crew on a Lion Air flight the night before the crash were able to recover, but also had difficulty figuring out how to respond, the NTSB said. Yet pilots in the Indonesia crash didn't perform it and the crew in Ethiopia started the procedure and then reversed course, according to preliminary investigation reports. The company assumed pilots would easily recognise an MCAS failure and counteract it.īoeing's 737s, including the Max models as well as earlier versions, have a relatively simple procedure for shutting off the motor that was driving down the nose. We are committed to working with the FAA in reviewing the NTSB recommendations," the company said in a statement.īoeing assumed that an MCAS failure had a safety risk that was "major," which was less severe than the "catastrophic" category, the NTSB said. "We value the role of the NTSB in promoting aviation safety. The FAA said in a statement on Thursday, local time, that it would review the NTSB recommendations as it considers the proposed changes to the 737 Max: "The lessons learned from the investigations into the tragic accidents of Lion Air Flight 610 and Ethiopian Airlines Flight 302 will be a springboard to an even greater level of safety."īoeing said safety was its top priority. The FAA, regulators in other nations and Boeing have made similar conclusions in recent months about the need to ensure that average pilots can respond to complex emergencies. Schulze said that it should be done before the Max flies again. But the NTSB concluded those standards dating back to 1988 weren't adequate and it called on the FAA to require more realistic assessments of complex emergencies during certification testing. The way Boeing designed its flight tests was permitted under existing rules. The agency's 737 Max recommendations don't call for any specific updates to the plane or other aircraft, but could lead to sweeping and costly changes.
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