Singapore legislation
Regulation 114
of Air Navigation (135 — Commercial Air Transport by Helicopters and Small Aeroplanes) Regulations 2018
Regulation 114
Device to warn flight crew of loss of pressurisation
An AOC holder must ensure that every small aeroplane that —
(a)
is a pressurised aeroplane; and
(b)
is to be operated at any altitude above 25,000 ft,is equipped with a device to provide positive warning to the flight crew of any dangerous loss of pressurisation.