DP gradients under both TERPs and PANSOPS are not designed to take account of engine failure. But you are still required to ensure that you can avoid all obstacles OEI hence you must have a contingency based on an obstacle analysis and your engine out performance. If you can see the obstacle you can avoid it hence part of the contingency might be cloud and visibility departure minima.
You must be able to do this with a net gradient ie a 0.8% margin to what the aircraft can actually give. That is where your second paragraph comes in. An obstacle clearance chart in the AFM already has the net performance buffer factored in.
Last edited by oggers; 17th May 2019 at 10:59.