They must justify the lien, such as with unpaid bills! It can't be "for any reason".
You wouldn't think it was a rotten system after a guy flies off into the sunset owing you for an overhaul, never to be seen again. Ask ANY mechanic!
If someone wants to get "back" at me, they invent a reason for a lein, file it, don't tell anyone, and years down the road, I go to sell, discover the lein, cannot find the person who placed the lein to clear it, now what do I do?
Probably not a bad reason to check every couple of years, your records with FAA. Request a CD, its cheap. Kinda like getting your credit report ocassionally so you can see who has been inquiring about your credit.
Charles