[WalterBright]

There were several factors causing the accident:

1. The AOA sensor was faulty

2. The installation of the AOA sensor apparently didn't check for proper operation

3. The MCAS system was connected to only one of the two AOA sensors

4. The MCAS system had too much authority

5. The LA pilots did not think to turn off the stab trim system when it ran away

6. The EA pilots did not receive, read or remember the Emergency Airworthiness Directive sent to all MAX pilots after the first crash that basically said to turn off the stab trim when it runs away

7. The first MCAS incident was when the crew simply turned off the stab trim and landed safely. The information about the faulty sensor was not passed on to the next crew, who crashed.