278
Boeing 737 Max planes are grounded after a hole blew in one mid-flight
(www.theverge.com)
This is a most excellent place for technology news and articles.
That's the problem... Reusing a 50+-year-old design, with new engines and other technology that should have been used with a new fuselage design...
I don't think they'd ground the entire fleet if this was just a mechanic who made some one-off error. There's probably some human error involved, but those on the ground human errors are only catastrophic because of the design choices Boeing made.
I mean I'd argue it's only 30 years since NG, but that's a different argument. It's not like it isn't a proven airframe that still goes through continual process improvements. They certainly could have done things differently, but way more time and cost.
I don't think they know the exact cause and they grounded them out of an excess of caution. I'm going to guess a process got bought off that wasn't complete. That's the kind of thing that's engineered to not fall off if it's properly installed.
We'll see how things pan out in the next few days.