A noise was heard after shutdown from a two hour flight. This was found upon inspection of the C-box cooling fan. No temp lights illumiated for the transmission, although it did show signs of over temping. Debris was scattered through the aft pylon area and took a few hours to clean it all out. If the C-box had failed, it would have been catastrophic, since the bladses would have come out of phase. The reason for failure is unknown.
Fan blade and shaft.
bottom of C-box fan.
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