punka, the local accident I mentioned the crew were doing asymmetric as I said, probably what saved the fin coming off perhaps is that they had the rudder boost turned off so were unable to get enough rudder in to control the yaw with two engines on one side at idle. From Aviation Safety,
Thanks for the interesting accident info.
Not sure what speed they were at and what speed their maneuvering speed would have been. If below Va, I believe that the fin can withstand a single full deflection input of the rudder. I suspect this was an accident exacerbated by a lack of sufficient airspeed for the situation they were in.
