Originally Posted by skyjob
Finally, if you experience an engine failure, flying an engine out procedure, remember this is procedure designed to take into account the limitation as above, either 5 or 10 as purchased.
This thus requires crew to be aware of the time after which (even if not yet having completed the escape manoeuvre) to select MCT. Many crew in the simulator are oblivious to this fact as they tend to practise EO which achieves Flap Up selection and MCT selection within 5 minutes. When faced with the time limitation (due required turns, very heavy weight, a higher MFRA than standard, etc), many crew forget the time limitation and it becomes a nice discussion point afterwards.
Given that (at least with Boeing) the swich from 5 minute to 10 min T/O thrust limit is only a paper (and money) exercise, the 5 minute limit shouldn't be understood as hard limitation. And since the aircraft doesn't need to be modified to be able to sustain 10 min T/O thrust (of course only in case of engine failure as mentioned by somebody else), the engine won't sieze at 5:01 just because you don't have the correct AFM Appendix. In my opinion it's much more important to have the aircraft at a safe attitude and position (lateral and vertical) before reducing the thrust to MCT. Engine failure is an emergency situation anyway, which grants commander exemptions from most of the aircraft limitations, as long as it's benefitial to the safety of the aircraft and its occupants.