Regulatory Background
14 CFR Part 3, Subpart C, §3.301, 302, and 303
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Applicability:
You need to assign a U.S. agent for service,
if you hold a Certificate issued under Part 61 (Pilots, Instructors), 65 (Mechanics), 67 (AMEs), or 107 (Remote pilots) and do not have a physical U.S. address on file with the FAA.

The Certificate holder’s responsibility is to:
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Assign a U.S. agent for service through https://usas.faa.gov/, if required.
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Make sure the agent for service understands the role and responsibility
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Receive the consent of the agent for service to act as such
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Inform the FAA about a change of agent for service inside of 30 days.
Effective dates:
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For new Certificates or Ratings this rule is already in effect.
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All Certificate holder need to comply by July 7, 2025
Non-compliance:
Individuals who are required but fail to designate a U.S. agent for service
“…may not exercise the privileges of any certificate, rating, or authorization…”
That means, it would be a federal offense to use your Certificate with potential severe consequences.
Assigning an agent for service without knowledge and consent would also be a federal offense.
References:
14 CFR part 3, subpart C
eCFR :: 14 CFR Part 3 Subpart C -- Designated U.S. Agents for Service (FAR Part 3 Subpart C)
More details can be found in the Federal register:
Advisory Circular 3-1 can be found here