Can someone explain why there has been such a long time between the decision to put in fuel bladders and that actually happening. 3 friends of mine each with R44's have complied with the sb/ad, but it appears some owners (50% in Aus??) haven't. At a cost of say 20k to achieve is it that expensive? Given the results that we have seen now a few times in Australia. When does the regulator step in and say "That's enough! Get it done guys" In this accident, the fact the aircraft became airborne again even monentarily leads me to think it may have been survivable for all inside. I've done 1000hr in 44's and love them but I think that the tanks must now be done without delay. My experience with Eurocopter and ad's ( whilst annoying) lead me to think that it would not carry on nearly as long as an unfixed problem. In other words they send out an ad, and it gets fixed, and too bad about the expense.