Originally Posted by
Mitchaa
I would think it would be nigh on impossible to have a failure of the pin and the wire locking considering as someone else has mentioned, there’s no loading there, they are simply to lock the nut to the shaft.
The release of the SB most probably points to neither the pin or the locking wire being present. The big question, were they ever fitted and locked and if so, how did 2 sets of eyes during a duplicate inspection miss it? Not impossible, but certainly unusual.
It is also possible that the SB resulted from an observation of condition of the recovered assembly. By itself does not 'prove' that this is the cause of the accident.
In other words they saw something unexpected that warranted inspections such as incorrect assembly order but not by itself the root cause.
Would a hard over servo runaway result in the reported (by some only) grinding noises?