Quote:
Originally Posted by BBKing
I still want to know why the engine damage was so different.
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I think that both engines would have been windmilling so I'm fairly sure that both would have been turning when landing (and therefore still contain a fair amount of energy in momentum) so maybe the difference in damage to the fan blades is more due to the different routes that the engines plowed through the ground. If you take a look at the first pic
here you can see that not only did engine #1 damage plow through the most ground, it would have also hit the concrete of the runway more directly. Looking at the images that jkat posted it also seems that there is more damage to the bottom of engine 1, so it would make sense that there would be more damage to the fan blades even if they were spinning at the same rate.
At the moment, my money is on a software or sensor problem, but then I'm a software developer so I naturally assume that the problems will lie there!
This airworthiness directive has been mentioned a lot on PPRuNe. It relates to a similar problem on 777s with GE rather than RR engines but maybe the RR engines have a similar flaw - this flight had taken a pretty chilly route in colder than usual conditions.