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Arthur T Knackerbracket has found the following story:

Boeing Co. limited the role of its own pilots in the final stages of developing the 737 MAX flight-control system implicated in two fatal crashes, departing from a longstanding practice of seeking their detailed input, people familiar with the matter said.

As a result, Boeing test pilots and senior pilots involved in the MAX' development didn't receive detailed briefings about how fast or steeply the automated system known as MCAS could push down a plane' nose, these people said. Nor were they informed that the system relied on a single sensor, rather than two, to verify the accuracy of incoming data about the angle of a plane's nose, they added.

See also: https://www.wsj.com/articles/boeings-own-test-pilots-lacked-key-details-of-737-max-flight-control-system-11556877600

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