T/O power EGT limit is 650C for five minutes except in the case of engine failure when it is ten minutes with most engines. I personally would regard 649C the same as 650C then reduce thrust to max continous if needed after five minutes other than in the case of engine failure. However, under normal circumstances, you never need takoff thrust for five minutes anyhow, you would set climb thrust long before that. Do you fly airplanes LEM?