Minimum Climb Gradient with no published SIDs

[wotan]

Heh Guys,

I got a question that came up recently in the office. When departing from an airfield that has no published SID's or DP's what is the minimum climb gradient that will keep you safe from terrain ( is it the 2.4% as per certification of a/c?) and how far lateraly do you have to maintain it to remain safe (MSA extends to 25nm?).

Is the airfield surveyed for obstacles in all directions when no SIDs exist? What procedures would you adopt in this situation when visual cannot be maintianed after rotation?

thanks in advance.