FAA.gov ad list on the web page.
There are several companies that provide AD lists; our repair station uses ATP.com. I find it more reliable to go right to the FAA source - the key is looking up the engine, propeller, and all appliances. Only searching for the airframe will not provide the entire list of applicable ADs.
I use Zook Aviation, in any case your IA must have a way to get a list for you.
FAA web site.