How its done in Oz...
Apart from one small area on the Northwest coast, all Australian Offshore Ops are undertaken with Performance Cat 1 or 2 multi engine, multi crew IFR helicopters. {That one small operation is between close monopods within 10 nm of shore with SAR Multi’s and a fast boat available].
• All Offshore flights have beach return fuel on departure.
• All onshore departures AUW is less than:
1. MTOW
2. OEI at LSALT [including diversion to Alt Fuel]
3. WAT Chart
• Offshore departures is limited [RTOW] down to normally the OGE weight.
As I have said before…an Oil Platform with any performance limiting failure onboard is not the place to be. Far better on your floats beside it. [Remember heli ops is the most dangerous part of offshore ops, its not smart to take a “bomb” onto a platform and endanger another 100+ workers.]