Correction, you are right it is the inner hub, with a 360 deg. circumferential crack. Inner hub cracks were visible through outer hub spoke holes. It happened a long time ago in October 1993. I just dug out my records to refresh my memory. Cheers, HD.
Date: 6th October, 1993
From: C.F.E.T. TO: All Aircrew
Subj : Wheel inspections
The attached illustration shows the #12 main wheel (right rear body gear) removed from ****** at ********** recently.
It is very unlikely that the damage to this wheel occured during the last landing. This highlights the necessity to carry out a thorough inspection of all wheels during walkaround checks. Although several broken wheel tie bolts have been discovered by our crews during walkaround inspections on *** airplanes in the past, damage of this type could easily be missed by a cursory inspection.
The potential consequences of this wheel disintegrating need no elaboration.
Regards,
*************
*************
Chief Flight Engineer, Training.