The requirement to add 50ft. for NPAs is there only because in case of a GA you loose 50ft before the aircraft starts to climb. Circling approach comes out of an instrument approach but with a circling minima which is always higher than the NPA minima. If you go missed at circling minima you do not breach NPA minima. Adding another 50ft to the already higher minima could result in a GA instead of a successful landing. Airbus does not teach to add 50ft. If it is regulatory requirement it is up to the operator to do so. Timing is required but it is only a guide. It is a visual manoeuvre run way must be kept in sight at all times turn early if required.
Last edited by vilas; 28th Jul 2016 at 11:36.