The operator shall take into account, when establishing minimum flight altitudes-
(a) the accuracy with which the position of the helicopter can be determined;
(b) the possible inaccuracies in the indications of the altimeters used;
(c) the characteristics of the terrain in the areas where operations are to be conducted;
(d) the probability of encountering unfavourable meteorological conditions; and
(e) possible inaccuracies in aeronautical charts.