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Install Ribs R2 to wing assembly in the locations indicated on the plan sheet.
Next lay in the 1/16” ply spar doubler S2 between ribs R2 and on the aft side of spar S1 – retain the ply doubler
by slipping ribs R1 over the spar and doubler. Wick thin CA in between the balsa S1 spar, ply doubler S2, and
ribs R1.
Install Ribs R3 as indicated on the plan sheet. Next, Install Rib R4 at wing tips as indicated on the plan sheet.