How long is the validity of a Certificate of Airworthiness?

A Certificate of Airworthiness is an official document that signifies that an aircraft is fit for flight and meets the necessary safety standards established by the aviation authority. The validity of this certificate is tied to conditions related to the aircraft's operational status.

The correct answer reflects that a Certificate of Airworthiness remains valid until it is revoked or withdrawn. This means that as long as the aircraft continues to meet the required safety and maintenance standards, and no significant changes that affect its airworthiness occur, the certificate remains in effect.

Factors such as the continuous compliance with maintenance checks, the aircraft's operational integrity, and adherence to regulations influence the validity of the certificate. If the certificate is either revoked due to failure to meet these standards or withdrawn by the owner or authority for any reason, it loses validity.

This interpretation aligns with aviation regulations, which do not impose a fixed renewal period like 12 months but rather conditions that maintain the certificate's active status. Therefore, if the aircraft is consistently airworthy, the certificate will stay valid until an official authority decides to revoke it or the owner voluntarily withdraws it.