Boeing decided to not just rewrite the software for the MCAS flight control system, which is believed to have contributed to both MAX crashes, but the entire flight computer software.
The new software intends to have the 737 Max's two separate flight computers communicate with each other for the first time. In the past, one of the 737’s flight computers would operate independently and switch to the other during the next flight.
During the audit last weekend, they found that the two flight computers were not talking to each other at start-up. An employee works near a Boeing 737 Max aircraft at Boeing's 737 Max production facility in Renton, Wash., on Dec. 16, 2019. An employee works near a Boeing 737 Max aircraft at Boeing's 737 Max production facility in Renton, Wash., on Dec. 16, 2019.
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