The NTSB findings and recommendations on the fatal Walter Huang crash are now available (PDF here: ntsb.gov/news/events/Do…). Here are a few of what I believe are the most consequential:
Finding 11: "The Tesla Autopilot system did not provide an effective means of monitoring the driver’s
level of engagement with the driving task."
level of engagement with the driving task."
Finding 15: Because monitoring of driver-applied steering wheel torque is an ineffective surrogate measure of driver engagement, performance standards should be developed pertaining to an effective method of ensuring driver engagement in SAE L2 partial driving automation systems
Finding 16: If Tesla Inc. does not incorporate system safeguards that limit the use of the Autopilot system to those conditions for which it was designed, continued use of the system beyond its operational design domain is foreseeable and the risk for future crashes will remain.
Finding 17: NHTSA’s failure to ensure that vehicle manufacturers of SAE Level 2 driving automation systems are incorporating appropriate system safeguards to limit operation of these systems to the operational design domain compromises safety.
Finding 19: The National Highway Traffic Safety Administration’s approach to the oversight of automated vehicles is misguided, because it essentially relies on waiting for problems to occur rather than addressing safety issues proactively.
Combining Findings 20 and 21 here, since they are both related and too long to fit into single tweets. I can't recall NTSB ever challenging NHTSA as directly as they did in today's hearing and in these findings. 
These are NTSB's Recommendations to NTSB in the wake of this investigation, as well as past investigations into the safety of Tesla's Autopilot system. Recommendations 2 and 4 strike me as being the most consequential.
Here are the two recommendations that NTSB already made to NHTSA, and are now reiterating. Both were already classified "Open-Unacceptable Action," reflecting NTSB's dissatisfaction with NHTSA's response (or lack thereof).
Finally, the big one: two previously-made NTSB recommendations to Tesla itself that the board has now reiterated and reclassified as “Open―Unacceptable Response.”
