Aircraft Flight Operation Regulations Article 296
Unless otherwise authorized by ATC, each person filing an IFR flight plan must include an alternate airport unless:1. A standard instrument approach procedure to, or a special instrument approach procedure has been issued by CAA to the operator for, the first airport of intended landing; and2. For aircraft. For at least 1 hour before and for 1 hour after the estimated time of arrival, the ceiling will be at least 2,000 feet above the airport elevation and the visibility will be at least 4,800 meters.3. For helicopters. At the estimated time of arrival and for 1 hour after the estimated time of arrival, the ceiling will be at least 1,000 feet above the airport elevation, or at least 400 feet above the lowest applicable approach minima, whichever is higher, and the visibility will be at least 3,200 meters.Unless otherwise authorized by CAA, no person may include an alternate airport in an IFR flight plan unless appropriate weather reports or weather forecasts at that airport will be at or above the following weather minima:1. If an instrument approach procedure has been published, or a special instrument approach procedure has been approved by CAA to the operator, for that airport, the following minima apply:a) For aircraft: The alternate airport minima specified in that procedure, or if none are specified the following standard approach minima: For a precision approach procedure, ceiling 600 feet and visibility 3,200 meters. For a non-precision approach procedure, ceiling 800 feet and visibility 3,200 meters.b) For helicopters: Ceiling 200 feet above the minimum for the approach to be flown, and visibility at least 1,600 meters but never less than the minimum visibility for the approach to be flown, and2. If no instrument approach procedure has been published in aerodrome and no special instrument approach procedure has been approved by CAA to the operator, for the alternate airport, the ceiling and visibility minima are those allowing descent from the MEA, approach, and landing under VFR.
中文原文 航空器飛航作業管理規則第296條
依儀器飛航規則製作之操作飛航計畫，應列有一處以上之備用機場。
但符合下列條件之一者，不在此限：
一、第一個目的地機場有標準之儀器進場程序或民航局核准航空器所有人或使用人使用特殊儀器進場程序。
二、飛機於預計到達機場時間前後一小時內之天氣報告或預報，其雲幕高超過機場標高二千呎及能見度超過四千八百公尺。
三、直昇機於預計到達機場時間前後一小時內之天氣報告或預報，其雲幕高超過機場標高一千呎或超過最低進場限度四百呎及能見度超過三千二百公尺。
依儀器飛航規則飛航時，備用機場最低天氣限度應符合下列規定。
但經民航局核准者，不在此限：
一、機場有標準之儀器進場程序或民航局核准航空器所有人或使用人使用特殊儀器進場程序，應符合下列最低天氣限度：
（一）飛機應依該機場已公布之最低天氣限度飛航；如該機場未公布最低天氣限度時，其最低天氣限度，於精確進場時為雲幕高六百呎及能見度三千二百公尺，於非精確進場時為雲幕高八百呎及能見度三千二百公尺。
（二）直昇機進場時天氣限度為雲幕高超過最低進場限度二百呎及能見度超過一千六百公尺，但不得低於進場最低能見度要求。
二、如機場未公布標準儀器進場程序或民航局未核准航空器所有人或使用人使用特殊儀器進場程序時，其最低雲幕高及能見度標準為目視飛航規則自最低航路高度下降、進場、落地之標準。
但符合下列條件之一者，不在此限：
一、第一個目的地機場有標準之儀器進場程序或民航局核准航空器所有人或使用人使用特殊儀器進場程序。
二、飛機於預計到達機場時間前後一小時內之天氣報告或預報，其雲幕高超過機場標高二千呎及能見度超過四千八百公尺。
三、直昇機於預計到達機場時間前後一小時內之天氣報告或預報，其雲幕高超過機場標高一千呎或超過最低進場限度四百呎及能見度超過三千二百公尺。
依儀器飛航規則飛航時，備用機場最低天氣限度應符合下列規定。
但經民航局核准者，不在此限：
一、機場有標準之儀器進場程序或民航局核准航空器所有人或使用人使用特殊儀器進場程序，應符合下列最低天氣限度：
（一）飛機應依該機場已公布之最低天氣限度飛航；如該機場未公布最低天氣限度時，其最低天氣限度，於精確進場時為雲幕高六百呎及能見度三千二百公尺，於非精確進場時為雲幕高八百呎及能見度三千二百公尺。
（二）直昇機進場時天氣限度為雲幕高超過最低進場限度二百呎及能見度超過一千六百公尺，但不得低於進場最低能見度要求。
二、如機場未公布標準儀器進場程序或民航局未核准航空器所有人或使用人使用特殊儀器進場程序時，其最低雲幕高及能見度標準為目視飛航規則自最低航路高度下降、進場、落地之標準。