Singapore legislation
Regulation 101
of Air Navigation (135 — Commercial Air Transport by Helicopters and Small Aeroplanes) Regulations 2018
Regulation 101
Crew intercom and public address system
An AOC holder must ensure that every relevant aircraft that is not an aircraft certified for single pilot operations is equipped with —
(a)
a suitable means to conduct passenger briefings; and
(b)
a crew member intercom system.