There may be some confusion here. The -0ft +50ft window is the tolerance for the initiation of the MAP for the purpose of testing and checking. I want to see the candidate initiating the MAP (assuming he is not visual) at or between DA and DA +50 ft. Provided he has done that, I am content for him to descend below DA. Initiation of the MAP below DA or above DA +50 ft is, however, a fail item.
Pete - you said that you are content for a candidate to go below DA, is that the official line for IR?