When does an aircraft registration certificate expire?

An aircraft registration certificate can expire under several circumstances, which makes the correct answer encompassing all listed conditions. When an aircraft is sold to a foreign entity, the registration must be canceled, as U.S. regulations require that an aircraft registered in the U.S. must be owned by a U.S. citizen or entity.

Additionally, if the holder of the registration loses U.S. citizenship, the registration becomes invalid as it is a requirement for maintaining U.S. aircraft registration status. Similarly, after the death of the holder, the registration certificate remains valid for only 30 days. After this period, it is no longer valid unless transferred to a legal heir or another entity compliant with U.S. registration requirements.

Each of these scenarios reflects a fundamental requirement tied to the ownership and nationality of the aircraft's registration status, confirming why the combination of these conditions leads to the expiration of the registration certificate.