Aircraft Flight Operation Regulations Article 285-5
A take-off alternate aerodrome shall be selected and specified in the operational flight plan if the weather conditions at the aerodrome of departure are at or below the applicable aerodrome operating minima or it would not be possible to return to the aerodrome of departure for other reasons.
中文原文 航空器飛航作業管理規則第285-5條
當起飛機場天氣在最低飛航降落限度以下或因某種原因不能轉回降落於起飛之機場時，操作飛航計畫應選定起飛備用機場。