I would suggest Door Four contains something lots of folks do not care to consider....that being the "root cause" is the basic design of the 225 MGB.
It is not capable of containing what should not be a catastrophic failure and fails in that regard due to its inability to transfer the load path to other parts of the gearbox following a failure within an individual module.
We know the existing detection and monitoring systems fail to give enough warning...so perhaps there must be a simpler explanation than what the Boffins are looking for.
The American MGB designs use "thru shafting" as a way of holding all the big pieces together unlike the AH 225 gearbox.
Or am I misunderstanding the various drawings I have been looking at?
Any of you design engineers able to help me with this?