Bearfoil
Using your location methodology, we are in agreement as to the location of the rigid coupling for the IP shaft.
I take it that your belief of the location of the failed stub pipe is different than what Ferpe's Post#1647 suggests? Where would the resulting fire occur, in the area of the radial drive arm? I had been thinking more along the lines of what Ferpe suggested. The ATSB isn't real specific but says in part: It has been identified that the leakage of oil into the HP/IP bearing structure buffer space (and a subsequent oil fire within that area) was central to the engine failure and IP turbine disc liberation event.
Turbine D