By "the machine" in the part vilas quoted I ment FMS. Trying too hard to avoid the word "box" that I loathe.
Sorry for any confusion caused.
Lantrin: No, it is not
always correct. And the wording is slightly misleading too. But nitpicking aside, yes it may and should be used.
(for single type failures when FWC correctly and in full reports what's gone wrong. Assuming one does not forget to properly work out a/thr and ice accretion additives)