Is an Airworthiness Certificate duration permanent?

An Airworthiness Certificate is indeed considered permanent as long as the aircraft remains in an airworthy condition. This means that the certificate does not have an expiration date, but it is contingent upon the aircraft being maintained and operated according to the applicable regulations and standards. If an aircraft undergoes significant alterations, experiences damage, or fails to meet maintenance requirements, the airworthiness status can be compromised, and thus, the certificate can become invalid.

The ongoing requirement to keep the aircraft airworthy underscores the importance of regular maintenance checks, compliance with airworthiness directives, and ensuring all operational conditions are met. This is what allows the certificate to remain valid for the lifespan of the aircraft, provided it remains in a condition that meets safety regulations.