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
![Capture-d-cran-2020-10-27-23-21-03.png](/proxy.php?image=https%3A%2F%2Fi.postimg.cc%2FzD4pTxLH%2FCapture-d-cran-2020-10-27-23-21-03.png&hash=163f5eb595be574a2d1af16b2dc58ba9)
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