Administrative Regulations on the Civil Aircraft Radio Stations Article 8

Modifying or altering the Station’s equipment by the owner or operator of the aircraft shall be conducted in accordance with the Regulation for Aircraft Airworthiness Certification and relevant technical documents approved by the CAA.
中文原文 民用航空器無線電臺管理辦法第8條
航空器所有人或使用人修改或改裝電臺之機件設備,應依航空器適航檢定給證規則及民航局核准之相關技術文件辦理。

English translation for reference only; the Chinese text prevails. Not legal advice.