Aircraft Flight Operation Regulations Article 158

An operator shall ensure that, before commencing a flight, each flight crew member assigned to duty holds and carries with him/her a valid license which is issued by CAA and appropriate to the type of operations.
中文原文 航空器飛航作業管理規則第158條
航空器使用人應確認其飛航組員持有並攜帶民航局核發證照之正確等級及有效日期後,始得飛航。

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