I am coming from India. And the connection flights are Mumbai> London(LHR) > LAX > Eugene

So for my travel back from Eugene to India the route is the same in reverse. After flying from Eugene to LAX the American Airlines shows a layover time of 40 min. And this is repeative for the same flight on different days too.

It is risky to go with this arrangement as it is so tight. But I wonder if it's the same airline that's conducting this it could be possible. But then again I am not a frequent flyer and I have been told not to go with this flight if risky.
Just this confusion of what's right and possible, wants me to ask this question.