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Wing Attach Bolts

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Joined
Mar 14, 2019
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I'm preparing to do the eddy current inspection on my Lance & the parts book calls out AN176-14A bolts for the outboard bolts. I looked into the spar box from the aft side to see how accessing the bolt heads would be & see that the bolts currently installed are a NAS type bolt, the kind with the concave head. I think these would be considered an upgrade from the AN 176's. Does anyone know what number these bolts would be? There are numbers on the heads so I may have to get back in there & see if I can read it. I'm attaching a picture. Thanks for your comments! David
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