The definition of "work" in your visa might be different than that of "aerial work" by the FAA.
For instance, you have a CPL plus the necessary type rating and act as SIC on a revenue generating flight (or ferry flight) but you're not getting paid for this - you're only getting the free flight hours.
As it's a revenue generating flight, it's aerial work and you need a CPL (at least). But as you're not getting paid, it might not be "work" as defined by your visa restrictions.
(Note the liberal use of "it might" - I'm not an expert in these matters, just suggesting that this may be something to check into.)