De-icing etc.
Ref blade deicing, what a crock of crap. The object of the exercise is to prevent ice forming in the first place. If it has formed your vibration level is up.
Regards HUMS and the duplex bearing saga- if the hums system fitted could not detect a bearing running dry forget it, Bristow IHUMS detected a crack in a high speed shaft adaptor that was ignored and subsequently caused a fatal accident. It certainly would pick up a bearing running without grease.
On the subject of being called "engineers". Where I come from we are called " Technician Engineers" and I have the documents to prove it, not "How to be a helicopter engineer in two easy lessons witha degree in bicycle repairs.