Rotorcraft Flight Manuals (RFM's) are full of nice information, some of which is permissive and some which is mandatory depending upon the section within it is found. (FAA system here) Thus problem solving has to start with the mandatory sections and work through the permissive. There is no exact right answer to some questions.
Scenario:
Night. Winter. North Sea. 150 NM from anywhere. Wind blowing a proper Hoolie (50 Knots or better). Sea State....huge steep breaking waves. OAT at the surface barely above freezing. Gear box light illuminates and pressure gauge starts fluctuating. Checklist and RFM says put out the call for the SAR boys and ditch.
Question: Do you ditch? If so...when and where?
Change the conditions above to 5 NM from a platform...excellent visibility, calm seas, Standby boat in sight next to the platform.
Do you ditch? If so... when and where?
Change the scenario to overland, summer time, farm land, nice country pub in sight under the nose with a huge pasture next to it, just at opening time for the pub.
What do you do now?