The fleet of MD902's all had a "Free of charge" tail boom extension over the last couple of years didn't they ?
AFAIK this was required to give extra thrust at the end of the tail boom to cater for an increase in power.
Presumably, as well as extending the tail boom itself by splicing in a new section, all the control gear would have had to be extended too wouldn't it ?
I wonder if it is the control gear extension that has failed
( Don't think it will have anything to do with a dodgy fan belt like the BBC says - if so perhaps it could be fixed with a pair of my better half's old tights
)