I had thought that the issues on the prior flights were only related to the Air Speed Indicator. However, this article seems to imply that the AoA sensors on the flight the night before were not in agreement, which would explain why one sensor was replaced. And the pilots on the flight the night before the crash were in fact able to manage through a sudden dive after take off. It seems quite amazing that the pilot managed through that flight at night with this problem.https://www.abc.net.au/news/2018-11-08/ ... h/10475468
Lion Air's first two attempts to address the airspeed indicator problem did not work, and for the Boeing 737 MAX 8 plane's second-to-last flight on October 28, the angle of attack sensors were replaced, Mr Tjahjono said.On that flight, from Bali to Jakarta, the pilot's and co-pilot's sensors disagreed.
The two-month-old plane went into a sudden dive minutes after take-off, which the pilots were able to recover from. They decided to fly on to Jakarta at a lower-than-normal altitude.
Indonesian investigators said their flight procedure recommendations to Boeing were based on how the flight crew responded to problems on the Bali to Jakarta flight.