Alternate aerodromes — general requirements
35.  The pilot-in-command of a Singapore registered aircraft must not nominate an aerodrome as an alternate aerodrome unless —
(a)where the aerodrome has a specified instrument approach procedure, weather forecasts indicate that, at the estimated time of use of the alternate aerodrome, the cloud ceiling and visibility will be at or above the minima specified; or
(b)where the aerodrome has no specified instrument approach procedure, weather forecasts indicate that the cloud ceiling and visibility will be at or above the VFR minima specified in the Rules of the Air.