Regulations Governing the Certification for Aviation Products, Appliances and Parts Article 19

Changes of type design are classified as follows:1) A "minor change" is one that has no appreciable effect on the weight, balance, structural strength, reliability, operational characteristics, noise, fuel venting, and emissions, or other characteristics affecting the airworthiness of the product.2) All other changes are "major changes".
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19條
型別設計變更之分類如下:
一、輕度設計變更:指航空產品之重量、平衡、結構強度、可靠度、使用特性、噪音、燃油與廢氣排放及其他對航空產品適航性無顯著影響之變更。
二、重大設計變更:指除輕度設計變更外之其他設計變更。

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