Every land rights holder must possess a certificate as proof of ownership. If the certificate is lost, the Land Office (Kantah) will issue a replacement certificate. However, issues such as administrative defects are still encountered during the issuance process. One case related to this matter can be found in the Banda Aceh Administrative Court Decision No. 14/G/2023/PTUN.BNA. This study aims to examine and analyze the implementation of issuing replacement certificates that are administratively defective. The research findings indicate that, first, the elements required in the issuance of replacement certificates have not been fully met. The Banda Aceh Municipality Land Office has not fulfilled the principles of Good Governance (AUPB) and the principles of land registration, namely the principle of security and the principle of accuracy. This is evidenced by discrepancies between the data submitted in the documents and the actual facts.