Final answer:
According to 14 CFR part 48, a person must register a small UA owner when they meet certain criteria. However, there are circumstances when a person may not be permitted to register their small UA. These include not being a U.S. citizen or legal permanent resident and using the small UA for purposes other than recreation or hobby.
Step-by-step explanation:
According to 14 CFR part 48, a person must register a small UA (Unmanned Aircraft) owner when they meet certain criteria. However, there are circumstances when a person may not be permitted to register their small UA. One such circumstance is if the person is not a U.S. citizen or legal permanent resident.
Another circumstance is if the small UA is not exclusively operated for recreational or hobby purposes. If the small UA is being used for any other purpose, such as for commercial use or as part of an organization's operations, the person may not be permitted to register it under part 48.
It is important for small UA owners to review the specific requirements and criteria outlined in 14 CFR part 48 to determine whether they are eligible to register their aircraft.