Pilots repeatedly voiced safety concerns about the Boeing 737 Max 8 to federal authorities, with one captain calling the flight manual "inadequate and almost criminally insufficient"
Among the disclosures found by The News, four others reference problems with an autopilot system during takeoff and nose-down situations while a Boeing 737 Max 8 was gaining altitude.
The FAA said the reports get filed to NASA – a neutral 3rd party for reporting purposes. But a federal audit in 2014 said the FAA does not collect and analyze its voluntary disclosure reporting in a way to effectively identify national safety risks.
https://www.dallasnews.com/business/airlines/2019/03/12/boeing-737-max-8-pilots-complained-feds-months-suspected-safety-flaw