Core Ice Removal
The second question refers to the Trent800(B777) as per OMB recommended by Boeing and RR. However it appears that both the 700&800 have the same problem. So Herc Jerk when you refer to the FCOM I assume your talking Airbus. However several customers have apparently requested to be able to take off upto 60 mins total taxi time without carrying out the core ice shedding procedure. Apparently this is ok provided a borescope is carried out within 10 flights.