When is a Certificate of Registration considered invalid?

A Certificate of Registration is considered invalid when the aircraft is destroyed. This is because the registration reflects the existence and airworthiness of a specific aircraft. Once an aircraft is destroyed, it can no longer be operated, and therefore, the registration associated with that aircraft becomes void.

Selling an aircraft does not invalidate the registration; instead, the registration must be transferred to the new owner, maintaining its validity. Similarly, if an aircraft undergoes maintenance, the registration remains valid as long as the aircraft continues to meet airworthiness standards. A change in the registration number, often required for various administrative reasons, does not invalidate the certificate; it merely indicates a new identifier for the same aircraft under continued registration.