Singapore legislation
Regulation 54
of Air Navigation (121 — Commercial Air Transport by Large Aeroplanes) Regulations 2018
Regulation 54
Cosmic radiation
Subregulation 1
An AOC holder must establish procedures in its Operations Manual for the operation of any large aeroplane at an altitude above 49,000 ft.
Subregulation 2
The procedures established in accordance with paragraph (1) must include —
(a)
procedures for the use of equipment to monitor cosmic radiation on a flight which is operated at an altitude above 49,000 ft; and
(b)
procedures for recording the total cosmic radiation dose received over a period of 12 consecutive months by any person who is assigned duty as a crew member of a flight which is operated at an altitude above 49,000 ft.