WASHINGTON - US aviation authorities will defend their certification methods for new planes before lawmakers Wednesday, two weeks after grounding the Boeing 737 MAX over two deadly crashes in less tha
n five months.
The aircraft was grounded following two deadly accidents involving Ethiopian Airlines earlier this month and Lion Air in October that together killed 346 people. Engineers have been focusing on problems with the Maneuvering Characteristics Augmentation System , a stall prevention system designed to point the nose of the 737 MAX 8 downward if it is in danger of stalling, or losing lift.
"The certification process was detailed and thorough, but, as is the case with newly certified products, time yields more data to be applied for continued analysis and improvement." Elwell was set to concur, saying authorities will only allow the aircraft to fly again "when the FAA's analysis of the facts and technical data indicate that it is appropriate."Preliminary results in the investigation into October's Lion Air crash in Indonesia indicate a single "angle of attack" sensor, which feeds data to the MCAS, malfunctioned but continued transmitting data to the plane's flight systems, including the MCAS.
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