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Old 11-27-2019, 08:26 AM
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rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,793
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The fasteners you mentioned can be subject to rotation (as Gary already mentioned).
We often think of bolted assemblies on aircraft to be entirely static but they can move under certain load conditions.

For example - Under high G's, wing tips can deflect up to 1.5 inches or more depending on load and model. If the wing is deflecting, there would be a very slight movement at the rear spar clevis joint, so a castelated nut and cotter pin is used.
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Scott McDaniels
Hubbard, Oregon
Van's Aircraft Engineering Prototype Shop
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RV-6A (aka "Junkyard Special ")
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