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Stub wing aft spar bolts

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Reviewing the Ryan rigging manual, there is a statement to use SPEC X bolts in the stub wing aft spar attachments and NOT standard AN bolts.  The parts manual calls for WS-58-XXX bolts in this area.  SPEC bolts can be higher or lower strength or close tolerance bolts.  I cannot find a reference in any of my Ryan manuals or the aircraft hardware manuals that I have for the specification for these WS-58 bolts.  Does anyone have a print or reference for these bolts?  I wonder how many Ryan's are flying with standard AN bolts in this location?  Might be worth a look to see what you have installed.  You can see the upper bolts from inside the aft cockpit with an inspection mirror and a light.




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