Singapore legislation
Regulation 112
of Air Navigation (135 — Commercial Air Transport by Helicopters and Small Aeroplanes) Regulations 2018
Regulation 112
Non-pressurised aeroplanes
An AOC holder must ensure that a small aeroplane with a non‑pressurised cabin is not operated above flight level 100 for any commercial air transport operation except under and in accordance with an approval granted by the Director‑General of Civil Aviation.