On the Lion Air flights, the angle-of-attack sensor had failed and was sending erroneous readings indicating the plane's nose was pointed dangerously upward. MCAS is driven by a single sensor near the nose that measures the so-called angle of attack, or whether air is flowing parallel to the length of the fuselage or at an angle. "It's simply implausible that this MCAS deficiency by itself can down a modern jetliner with a trained crew," Guzzetti said. The combination of factors required to bring down a plane in these circumstances suggests other issues may also have occurred in the Ethiopia crash, said Jeffrey Guzzetti, who also directed accident investigations at FAA and is now a consultant. "After this horrific Lion Air accident, you'd think that everyone flying this airplane would know that's how you turn this off," said Steve Wallace, the former director of the US Federal Aviation Administration's accident investigation branch. The baseline MAX, equivalent of the 737-800. Overall length 33.7m, Max capacity 172 passengers hence two pairs of overwing exits, Range approx 3825nm. If the same issue is also found to have helped bring down Ethiopian Airlines Flight 302, one of the most vexing questions crash investigators and aviation safety consultants are asking is why the pilots on that flight didn't perform the checklist that disables the system. A slightly shorter, longer range version of the -8 but longer than the 737-700. There have been no reports of maintenance issues with the Ethiopian Airlines plane before its crash.Īfter this horrific Lion Air accident, you'd think that everyone flying this airplane would know that's how you turn this off. The Allied Pilots Association union at American Airlines also said details about the system weren't included in the documentation about the plane.įollowing the Lion Air crash, the FAA required Boeing to notify airlines about the system and Boeing sent a bulletin to all customers flying the Max reminding them how to disable it in an emergency.Īuthorities have released few details about Ethiopian Airlines Flight 302 other than it flew a "very similar" track as the Lion Air planes and then dove sharply into the ground. "It makes us question, 'Is that everything, guys?' I would hope there are no more surprises out there." "We don't like that we weren't notified," Jon Weaks, president of the Southwest Airlines Pilots Association, said in November.
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