Im not sure what my maximum number of hours per month I can operate (Im British Airways Longhaul crew) but the maximum number of hours I can work in a 12 month rolling period under European rules is 900 hours (I suppose that would answer your question of 75 hours a month only this is not strictly so as its only done in a 12month rolling period as opposed to a monthly rolling period).
Come september I will have reached 900 hours and now Im rostered a crap load of standby which they cant really use me on unless they are desperate. However because my duty this week has been cancelled as a result of the security problem it looks like I will be back under my 900 hours again!!!
