YankeeBravo
Member
lnstructions are : Machine countersink the nutplate screw holes. See Page 13-3, Figure 2 for details of the countersunk hole.
Page 13-3 gives you a quite deep countersunk using the nutplate hole as a guide which is not the case on 28-3 as the nutplate is not yet installed. Why are those countersink different (deeper) from the one done on F-1005C-L channel as the side cover covering both seems to use same method of attachment ?
Also why is the middle hole of those 5 holes countersunk as the mid cabin side covering it will not be dimpled ? For me the middle hole does not need to be countersunk at all ?
Maybe someone can help
Page 13-3 gives you a quite deep countersunk using the nutplate hole as a guide which is not the case on 28-3 as the nutplate is not yet installed. Why are those countersink different (deeper) from the one done on F-1005C-L channel as the side cover covering both seems to use same method of attachment ?
Also why is the middle hole of those 5 holes countersunk as the mid cabin side covering it will not be dimpled ? For me the middle hole does not need to be countersunk at all ?
Maybe someone can help
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