Originally Posted by
Excargodog
You take most any piece of transportation equipment that’s fifty years old and compare it to modern standards and it’s going to fail. Most of the ferry systems and passenger rail lines don’t meet current life-safety codes and operate only under “grandfather” clauses.
An example:
https://komonews.com/archive/danger-...-below-seattle
I think there's a practical limit, if they go back and start looking at previous versions of the 73, well they know the FAA could find a reason to ground the bus (or anything else) if they really wanted to.