Originally Posted by
Satcomm
2 bolts in a single foot is not really redundanticy, when the foot breaks off you just have 2 useless bolts in the frame rather then 1.
That's not correct. What I stated is that having two bolts at each attachment, where one bolt would be capable of providing continued safe operation should the other bolt fail, provides single fault tolerance for the
fastener function. In terms of fault tolerance, this is considered independent from a failure of the associated housing structure. Two bolts are used at each flight critical attachment because failure of one bolt is considered to be a possible event, while structural failure of the housing is considered to be an extremely improbable event.