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PBN aims to be certain world wide standardisation of RNAV and RNP technical specs and to limit the proliferation of navigation technical specs in use planet-extensive.A variety of difficulties exist linked to the introduction of PBN, most notably in the fields of:Hồ Kym Thanh Hương Bình Lưu Luyến Hoàng Oanh PBN seventy seven chỉ có 1 t�