Singapore legislation
Regulation 37
of Air Navigation (125 — Complex General Aviation) Regulations 2018
Regulation 37
Take-off alternate aerodrome
Subregulation 1
A CGAC holder must select, and specify in its operational flight plan, filed flight plan and preliminary flight plan (if applicable), a take‑off alternate aerodrome for a complex general aviation operation if —
the meteorological conditions at the aerodrome of departure are below the CGAC holder’s established aerodrome landing minima for that operation; or
it would not be possible for the aircraft to return to the aerodrome of departure for other reasons.
Subregulation 2
A CGAC holder must ensure that the take‑off alternate aerodrome selected in accordance with paragraph (1) is located —
within one hour of flight time of the departure aerodrome at a one‑engine inoperative cruise speed, if the aircraft is an aeroplane that has 2 engines; or
within 2 hours of flight time of the departure aerodrome at an all‑engine operating cruise speed, if the aircraft is an aeroplane that has 3 or more engines.
Subregulation 3
For the purposes of paragraph (2), flight time is calculated in International Standard Atmosphere and still air conditions using the relevant cruise speed as determined from the CGAC holder’s Operations Manual and the aeroplane’s actual take‑off mass.