Mr Proach,
Sorry, I don't have time to peruse the entire document about any differences regarding aerial work(I'm just waiting for kickoff in the footy) but a quick view of the definitions in the 2013 Instrument reveals the following:
duty means any task that a person who is employed as an FCM is required to carry out associated with the business of an AOC holder.
duty period means a period of time which starts when an FCM is required by an AOC holder to report for duty, and ends when the FCM is free of all duties.
So, if your Company asks you to do anything for them then it's duty time, that whether it's paperwork, cleaning the hangar or answering phones.