Originally Posted by
Dave Therhino
Just my opinion based on a fair amount of background re fasteners, holes, coldworking, tooling, and a very very small bit of repair issues
First- thanks to dave for the document complete with pics
second - I will draw your attention to the FACT that it was/is the Fail safe strap portion of the PF - not the PF- as the scare press would infer-
third- note that most - many NG will need nothing done/inspected till the next check - and an estimate of 1 hour for inspection is not unreasonable- which does not count time to possibly clean area, maybe take photos and complete paperwork.
Fourth - Even assuming the crack went to both holes and to both edges, the ' wings' will not fall off since the larger bolts ABOVE the smaller ones take the load. Under that event, then a major rework of some type might well be needed.
Fifth - the obvious cure to prevent such happening would be during production to ensure at time of assembly, the holes in that area be drilled, coldworked, reamed, and interference fit bolts installed. A few extra steps- relatively easy to do during assembly at wichita. It is possible that such coldworking was supposed to be done- but was missed since it involves an extra drill and ream operation during assembly. No easy way to ensure it was done.
I'll refer you to my post number 11 in this thread for more details
28th Sep 2019, 07:45
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