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Asked by: 3830 views Flight Instructor

I am a flight instructor in JAPAN. We start to train CDFA on non-precision approach, though our aircraft does not have VNAV guidance, because most of AIP charts of Japan is designed for CDFA approach. As FAA states on Ac120-108, operators should instruct their pilots to initiate the go around at an altitude above the MDA, normally MDA plus 100ft, called Derived Decision altitude. Since we have to decide whether we are going to land or go around above MDA, this means we have to make decision at a little bit far away from threshold, we suppose the whether minima should be raised. However, CDFA from EU-OPS1  describes as follows, All non-presicion approaches shall be flown using the continuous descent final approach technique unless otherwise approved by the authority for a particular approach to a particular runway. When calculating the minima in accordance with Appendix 1, the operator shall ensure that the applicable minimum RVR is increased by 200 metres for CAT A/B aeroplanes and by 400m for CAT C/D aeroplanes for approaches not flown using the CDFA techinique, ・・・ This means, on the contrary, by using CDFA technique, the minima remains same value, and if not, the minima should be raised. I am wondering how they decide the concept of determining wx minima. Please tell us if you have any information. Thank you.    

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