Aircraft Flight Operation Regulations Article 346-2

An airplane shall be provided with surveillance equipment which will enable it to operate in accordance with the requirements of air traffic services unit.
中文原文 航空器飛航作業管理規則第346-2條
航空器應裝置監視裝備,並依飛航管制機構要求開啟使用。
但經民航局核准者,不在此限。

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