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Page 28-3 step 3 Forward Fuse, countersinking the F-1042 bulkhead side channel

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

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You are correct, the screw holes need to be countersunk with the nutplates in place and the middle one does not need to be countersunk (though it won't be a problem if you did). There also seems to be some confusion in the plans about where flush screws go - the undimpled flange at the bottom of F-1015D on page 35-9 gets AN515 screws. Trust your common sense, though asking is never a bad idea.
 
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