Regulations Governing the Certification for Aviation Products, Appliances and Parts Article 41

Aircraft's Certificate of Airworthiness must be displayed in the aircraft cabin or cockpit at a readily visible spot.
中文原文 航空產品與其各項裝備及零組件適航檢定管理規則第41條
適航證書應懸掛於航空器機艙或駕駛艙內顯著之處。

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