A right can of worms this one!
Several certifying engineers at my outfit have been seeking to get clear written guidelines on the maximum hours that can be worked when certifying.
We all know what its like......You go away to fix an AOG having already worked a 12 hour shift and then work silly hours on the AOG with the commercial pressures of getting the plane back in the air bearing down on you. Tempting as it may seem to walk away from the plane after working what you may regard as enough hours, how many actually do it?! (leaving the punters stranded whilst you rest plus the added knock on disruption to the flying program etc etc)
Its time companies are forced to limit working hours (especially for certifying staff) However, as others have said, it still suits many to work silly hours for money purposes and whilst there are those prepared to do this, companies are bound to take advantage!
BE