Singapore legislation
Regulation 44
of Air Navigation (98 — Special Operations) Regulations 2018
Regulation 44
Alternate aerodromes
Subregulation 1
For every aeroplane operated for EDTO by a Singapore operator with a special operations approval to conduct EDTO, the Singapore operator may select, as the take‑off alternate aerodrome, the first available alternate aerodrome located within the maximum diversion time that is calculated using the actual take‑off mass of the aeroplane —
where the aeroplane is a twin‑engined aeroplane, if there is no available alternate aerodrome within one hour of flight time of the departure aerodrome at a one‑engine operative cruise speed; or
where the aeroplane is an aeroplane with 3 or more engines, if there is no available alternate aerodrome within 2 hours of flight time of the departure aerodrome at an all‑engine operating cruise speed.
Subregulation 2
For every twin turbine‑engined aeroplane operated for EDTO, the Singapore operator must select, and specify in the operational flight plan and filed flight plan, every aerodrome required as an en‑route alternate aerodrome for EDTO using such an aeroplane.
Subregulation 3
The Singapore operator must ensure that, for every operation in accordance with the special operations to conduct EDTO, no flight proceeds beyond the applicable threshold time unless —
the Singapore operator is satisfied that every en‑route alternate aerodrome identified for the operation is available at the estimated time of use; and
the most up-to-date information indicates that, at the estimated time of use of such an aerodrome, the meteorological conditions at the aerodrome will be at or above the Singapore operator’s established aerodrome operating minima for the operation.
Subregulation 4
The Singapore operator must determine an alternative course of action if a safe approach or landing at the identified en‑route alternate aerodrome during the estimated time of use is precluded for any reason.