1 GENERAL
1.1 In instrument meteorological conditions pilots shall operate in accordance with the instrument flight rules except that within a control zone, a special VFR flight may be authorised.
2 APPLICABLE INSTRUMENT FLIGHT RULES
2.1 Flights shall be conducted in accordance with the Instrument Flight Rules (even when not operating in instrument meteorological conditions) when operated:
- More than 185km (100NM) seaward from the shoreline within controlled airspace; or
- During the hours between sunset and sunrise; or
- Above FL200.
3 DIRECT ROUTING OPERATIONS (DRO) – GENERAL PROCEDURES
3.1 APPLICABLE ROUTES AND FLIGHT PLANNING PROCEDURES
3.1.1 Direct routes are available on specified segments of ATS routes. Flights operating at FL290 to FL460 (both inclusive) should flight plan using the direct routes listed in the table below where applicable:
| Flight planning on ATS routes | Flight planning for DRO
(24-hours) | Remarks | Reduction in distance flown (NM) |
|---|
| VMR L642 ENREP M753 IPRIX | VMR L642 EGOLO DCT IPRIX | Applicable to northbound flights | 1.1 |
| IPRIX M753 ENREP L642 VMR | IPRIX DCT EGOLO L642 VMR | Applicable to southbound flights | 1.1 |
| PARDI G579 SJ B469 PU | PARDI DCT PU | Applicable to flights operating at FL290 to FL600 (both inclusive) | 1.9 |
| DUDIS L644 LIGVU | DUDIS DCT LIGVU | NIL | 2.2 |
| MELAS N892 MABAL | MELAS DCT MABAL | Applicable to Changi arrivals joining MABAL STAR and flights on ATS route N892 | 2.3 |
| ESPOB L642 EGOLO | ESPOB DCT EGOLO | NIL | 4.6 |
| ESPOB Q801 ESBUM Q802 ELALO | ESPOB DCT ELALO | Applicable to Changi arrivals joining ELALO STAR | 5.4 |