Engine Anti-Ice Runup Question
Our flight manual requires running up our GE CF6-802C2B5F engines on our B744s at 60% N1 for 30 seconds in the takeoff position prior to takeoff, during icing conditions. My question is after we have completed the 30-second runup should we then reduce the thrust to idle prior to beginning the subsequent takeoff procedure, or can we begin the takeoff roll from the existing 60% N1 and then set takeoff thrust directly from there? Our book doesn't discuss what to do after the runup in the takeoff position. Appreciate any thoughts/comments.