The radius filler (or saddle washer) has a number of benefits. One is that the fastener head/tail does not interfere/foul with the radius run-out of the fitting. This way you can locate the fastener nearer to the wall, reducing the bending moment. Another is that if you're clever, you can...
I would agree with rb1957 - there is very little to show for the need for "check-stress" only ever seen this in BAe on the A340 stress/design stages. All/most of the preliminary stress calcs were done in people's personal folders (mine included - on the A330/340 trailing edge structure), often...
Gentlemen - there may be a very simple answer to this. While there may be some material deficiency with the screws and/or their treatment, the way they are installed & torqued up has a large effect on their installed 'strength'. The torque is usually specified as dry torque, for which typically...
