Originally Posted by
METO Guido
Dunno. If you look at the attached chart, #2 shows what they describe as minor n1/n2 ‘perturbations’ but making power until impact. Goes on to mention performance trial runs awaiting input data, results.
Hmm. Caveat is that N1/N2 don't actually show power (ie thrust out of the bypass), just RPM. Hypothetically if the fan was all mangled, N1 might still be turning but not moving as much air as it should. Or the hot air from the fire might have stalled the fan... a stalled fan/compressor is actually easier to spin because it's not doing any work.
But looks like the root failure was the spherical bearing, not the lug assembly. That seems good, worst case it would be easy to just swap them all out. Assuming there are some in inventory, or they can mfg more quickly (should be able to do that, they don't look complicated). Especially since Boeing appears to have already superseded the original bearing with a redesigned version to address exactly this failure