NTSB releases their report (Executive Summary) on the incident of SWA Flt 1380 that resulted in 1 passenger's death and 8 others injured from shrapnel from the engine exploding entering the cabin.
There is a test that engines go through Fan Blade Off Tests (FBO Test). The test is to make sure exploding parts stay inside the engine closure. Which failed in the case of SWA Flt 1380.
What a test looks like: https://youtu.be/wcALjMJbAvU
What based on the report, the failure occurred in a way that the tests had not accounted for. So in other words the certification test is flawed. So have to update the test. Second, Boeing on the hook again for having a problem to solve for. Finally, to make sure NTSB is doing their job, SWA, make sure flight attendants sit in their jump seats. Really?
A failure happens in a way that was not suppose to happen, but was not tested for, a passenger is dead, partially sucked out the window and NTSB is saying attendants needed to get back in their jump seats. Really? The problem appears to be in testing standards are not correct and Boeing has another matter to deal with (along with their engine manufacturer).
Considering the number of 737s out there, probably have enough to deal with on the MAX issue.