Originally Posted by
multipilot
I would report the guy. The last thing you want to do is pick up a newspaper one morning and see a picture of this guy and his plane on the wrong side of the dirt when you could have done something about it.
Just my $0.02
Tough call. You're new to the scene and certainly don't want a reputation on the field as a rat.
For me it would come down to whether I think the guy is dangerous to himself and others.
His regulatory lazais-faire is certainly dangerous to your certificates and career. But if he's a perfectly competent wrench and a good pilot, there may not be a real safety issue...you know better than any of us.