H-Pork:
I'm really curious about the calculation of the possible climb gradient on departure. This question came up the other day when we departed from Chicago o'Hare Airport. In the departure plate it says the o'hare departure needs you to be in 5NM at 3000ft and in 8NM at 5000ft. How can you calculate if you are able to do it if you fly an e.g. A340-600 or a B747 or a A320 etc. When can you accept this departure or when is it better to refuse it. I would really appreciate any rule of thumb or detailed formula.
I don't find that on my Jepp charts.