Singapore legislation
Regulation 64
of Air Navigation (121 — Commercial Air Transport by Large Aeroplanes) Regulations 2018
Regulation 64
Minimum flight altitudes
Subregulation 1
An AOC holder must ensure that, when establishing the minimum flight altitude for a route of any flight of a large aeroplane, all of the following factors are taken into account:
the accuracy and reliability with which the position of the aeroplane can be determined;
the inaccuracies in the indications of the altimeters used;
the characteristics of the terrain;
the probability of encountering unfavourable meteorological conditions such as severe turbulence and descending air currents;
any possible inaccuracies in aeronautical charts;
all relevant airspace restrictions;
any minimum flight altitude established by the State in which the operation takes place.
Subregulation 2
An AOC holder must specify in its Operations Manual the method used to establish a minimum flight altitude under paragraph (1), including any conditions that the Director‑General of Civil Aviation may have specified when approving that method.