Originally Posted by
tartare
Fixed wing pilot here - can only find limited references to this on web - is blowaway power something peculiar to the S-76++?
I assume it's effectively being able to demand over 100 per cent power from both engines to get you out of a tricky situation?
Does the pilot have to manually select it - or does the FADEC automatically feed it in as collective changes are made - and generates some sort of warning that you are temporarily exceeding power limits?
It's common in modern twins. The FADEC normally limits engine power to respect the gearbox limitations but, once Nr decays to a given value, they will adjust the fuel scheduling to allow maximum single engine power from each engine. Typically this will result in maintenance action and possible gearbox change, but may save the airframe! It's automatic with no pilot input.