Just as some extra info. What is written in the FCOM about a caution.
CAUTION: An operating procedure, technique, etc., that may result in
damage to equipment if not carefully followed.
Somewhere else in the FCOM:
"CAUTION: Do not use engine or wing anti–ice when OAT (on the
ground) or TAT (in flight) is above 10°C."
If Boeing is consistent in its terminology, damage might occur above the 10°C
