Over the years one of the issues that has plagued aircraft owners and airport sponsors alike is trying to figure out what can be stored in an aircraft hangar that's on an airport that receives federal grant money through the Airport Improvement Program (AIP). That money comes with strings, the big one is that the airport must be used for aeronautical purposes—and that applies to what is stored in hangars on that airport. I've seen local rules that vary from being silent as what can go into a hangar to incredibly restrictive.
This is a companion discussion topic for the original entry at https://www.avweb.com/flight-safety/new-faa-hangar-policy-common-sense