The people in the know (NTSB, FAA) think about both the manufacturer and the maintainer (and the pilots and passengers, and the ATC and third parties and wildli

The people in the know (NTSB, FAA) think about both the manufacturer and the maintainer (and the pilots and passengers, and the ATC and third parties and wildlife and everything else). It is just that with the recent door bolt problem it seems maintenance was not the problem. It is because with airplanes like these maintenance is not a freeform, improvised activity. The manufacturer describes in exact detail what should be checked and when should be checked. (And also how should be checked and what should happen when things are wrong.) With the bolts simply they were not on the required maintenance checks so early in the airplane's life. That is why people were not talking about the responsibility of maintenance. They are not there to make sure the manufacturer put the airplane together properly. I don't know what were going on with this wheel. So maybe this is a totally different issue and maybe here the real culprit will be maintenance.