500E. Yes the old AS350 seats and attaching rails are a significant weakness imho. I often will check them, as on occasion the attachments appear loose (not bolted/adjusted to the deck correctly) - you might first notice it when a crew member or passenger is adjusting their position in the back and grabs hold of your handy seat, only to feel the seat tip slightly or shuffle
I have often had visions of someone inadvertently dislodging my seat which needless to say would leave us in a somewhat precarious situation. Watching that video and reading that report, really brings it home - not pleasant. It's a wonder that the modification - albeit a horrendous exercise and one which as a past owner would have caused me tremendous heartburn - hasn't been mandated as often shear forces are involved in incidents which look like they will make easy work of dislodging the seat.
6 weeks for that mod
What's that stuff - gorilla glue