The Oil Stub Pipe "Installation" was affected directly and profoundly by vibration overlooked in testing.
By reference to the Report, it is "an OIL SUPPLY tube". Not a scavenge, not a vent. The image of the "offending" tube shows damage caused by a poor (read loose) coupling and/or vibration. Whether an atomizer, or a coupling in one of the ten radial struts that support the Bearing Structure between the IPT and the HPT roller bearings. Apparently. No location is reported, but that is ok, the OIL FIRE is almost certainly not the cause of the Destruction, but an effect. There is no apparent evidence of fire in the LPT Drum. There is evidence (soot) at the forward portion of the LP Shaft (the aft stub). Damage was limited to missing Blades from LPT #1.
The IPT Blades efface the "Platform" of the NGV's of the Stator behind it. The Vanes were located at the forward portion (in the 700, Edelweiss) and generally acknowledged as preventing the Burst of the IP Disc, having slowed it in shearing its Blades. In QF32, the slide of the IPT into the platform likely heated the IP Disc Rim, fir trees, and the IPT lost its blades in this manner. It would explain a loss of P30 forward, first through the Gas Path, and then at the Splines at LP and IP Ball Bearing case. The immense reversal of torque would certainly serve to explain the IP (Shaft) sever, the Overspeed of the IPT, and the sequence of sounds reported. The reversal of Gas Path would explain sound #1, and the second sound would of course be the Explosive Burst of the IPT out the case (IP case).
As BigG22 has said, to conclude that the Burst was unrelated to the AD's is a bit of a stretch.
Nothing that has been released to the public, by way of explanation is wrong. Neither is it in any way even partially explanatory of the events on board 32Whale. The releases are beyond cautious, they are misleading in their content. If the Gas Path had reverted to forward of the IPT, it would overwhelm the seals of the bearings, and the Labyrinthines on the shafts. it could have even entered the Plenum and after the IPT exited, the continuing fire would be explained (Note the sooty streaks on the LPC guide Vane Cowl).
Last edited by bearfoil; 5th Jan 2011 at 16:41.