Noticed that N1 derated thrust can't be dropped below 84,9 value, not in auto N1 mode, nor in manual n1 bug mode. Noticed it in winter flight, then d-to values really low.
We believe FCOM:
It means, that -20 OAT we can reduced TO thrust to 25 % - 84,8 - 25 % = 63,6 N1
And it means, that -40 OAT shouldn't be more than 81,4 - 82,1 in UNEE (880 AGL), but we can see this:
And -50 OAT not more than 79,6
In high ambient temp and N1 higher 84,8 all works fine.
That should be correct. Thanks.