FAA spells out design changes needed in grounded Boeing jet

FILE - In this May 8, 2019, file photo, a Boeing 737 MAX 8 jetliner being built for Turkish Airlines takes off on a test flight in Renton, Wash. On the anniversary of the first crash of a Boeing 737 Max, the CEO will begin two days of testimony before Congress by telling lawmakers that the aircraft company knows it made mistakes and is throwing everything into fixing the plane.

It is not clear when the FAA will lift its March 2019 order grounding all Max jets, which followed similar orders by regulators in the rest of the world. Boeing officials said last week they hope to win regulatory approval to resume deliveries of completed Max jets in the fourth quarter of this year.

The FAA will require more redundancy in the plane's design to improve safety, including linking MCAS to two sensors instead of one. Both crashes occurred after the system pushed the plane's nose down in response to a single misfiring sensor. The agency will require an alert to warn pilots if there appears to a problem with the sensors.

The public will now get 45 days to comment, after which FAA is expected to publish a final rule for operating the Max. Airlines are expected to take several more weeks after that to train pilots and retrofit planes that have been parked for more than 16 months. The FAA said that when its work is done, "the 737 MAX will be safe to operate and meet FAA certification standards."

Lemme said Boeing's critical mistake was in assuming that it was fine for MCAS to rely on a single sensor instead of two, which is where the new design ended up.

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