Bearfoil...
Good point but I don't agree in this case. In support of your view I would BAN all mobile telephone devices from the assembly areas of aircraft production.
A worrying note was sent out by GE/PandW this last week about oil line integrity in its products. This means that oil lines are being repaired. That means welded. Welding chrome alloy nickel steel formulated to high specs is notably difficult even for those who do it all day and everyday.
In this case the RR oil tube is assymetrical. Weak on one side. Given the vibrations and heat cycles this is subjected too it means that in this case the T972 as used in Qantas 388 it was literally vibrated until it broke.
The oil was probably leaking already due to micro fractures which would have altered the combustion times and set up a further harmonic that wore the spline shaft. Basically the engine was fighting agin itself.
Given all the fancy software design tools the kids use these days it is ironic that we have a failure here that is so familiar and has been with us since 1910.
Ban moble phones in work places a good start. If a company wants to subcontract out work then it should employ a full time qualified engineer on site...even if this is in some far flung part of the planet. This really is a very simple engineering failure.
Rolls Royce will get get stung mightily in litigation over this.