If an aircraft is tied down, moored, hangared, or based in Michigan for more than how many days must it be registered annually?

The requirement for annual aircraft registration in Michigan is triggered when an aircraft is tied down, moored, hangared, or based in the state for more than 90 days in a calendar year. This regulation ensures that aircraft that are more permanently situated within the state are accounted for and can be monitored for safety, licensing, and taxation purposes. Registration helps maintain a clear record of aircraft operations and ownership in the state.

In this context, the selection of 90 days reflects a balance between transient use and more permanent residency, ensuring that aircraft owners who are using or storing their planes in Michigan on a more permanent basis fulfill the legal requirements of registration. This fosters accountability and supports infrastructure funding tied to aviation activities within the state.